[PATCH net-next v2 04/35] [RFC] phy: fsl: Add Lynx 10G SerDes driver

[Vinod Koul]

On 28-06-22, 18:13, Sean Anderson wrote:
> This adds support for the Lynx 10G "SerDes" devices found on various NXP
> QorIQ SoCs. There may be up to four SerDes devices on each SoC, each
> supporting up to eight lanes. Protocol support for each SerDes is highly
> heterogeneous, with each SoC typically having a totally different
> selection of supported protocols for each lane. Additionally, the SerDes
> devices on each SoC also have differing support. One SerDes will
> typically support Ethernet on most lanes, while the other will typically
> support PCIe on most lanes.
> 
> There is wide hardware support for this SerDes. I have not done extensive
> digging, but it seems to be used on almost every QorIQ device, including
> the AMP and Layerscape series. Because each SoC typically has specific
> instructions and exceptions for its SerDes, I have limited the initial
> scope of this module to just the LS1046A. Additionally, I have only added
> support for Ethernet protocols. There is not a great need for dynamic
> reconfiguration for other protocols (SATA and PCIe handle rate changes in
> hardware), so support for them may never be added.
> 
> Nevertheless, I have tried to provide an obvious path for adding support
> for other SoCs as well as other protocols. SATA just needs support for
> configuring LNmSSCR0. PCIe may need to configure the equalization
> registers. It also uses multiple lanes. I have tried to write the driver
> with multi-lane support in mind, so there should not need to be any large
> changes. Although there are 6 protocols supported, I have only tested SGMII
> and XFI. The rest have been implemented as described in the datasheet.
> 
> The PLLs are modeled as clocks proper. This lets us take advantage of the
> existing clock infrastructure. I have not given the same treatment to the
> lane "clocks" (dividers) because they need to be programmed in-concert with
> the rest of the lane settings. One tricky thing is that the VCO (pll) rate
> exceeds 2^32 (maxing out at around 5GHz). This will be a problem on 32-bit
> platforms, since clock rates are stored as unsigned longs. To work around
> this, the pll clock rate is generally treated in units of kHz.
> 
> The PLLs are configured rather interestingly. Instead of the usual direct
> programming of the appropriate divisors, the input and output clock rates
> are selected directly. Generally, the only restriction is that the input
> and output must be integer multiples of each other. This suggests some kind
> of internal look-up table. The datasheets generally list out the supported
> combinations explicitly, and not all input/output combinations are
> documented. I'm not sure if this is due to lack of support, or due to an
> oversight. If this becomes an issue, then some combinations can be
> blacklisted (or whitelisted). This may also be necessary for other SoCs
> which have more stringent clock requirements.
> 
> The general API call list for this PHY is documented under the driver-api
> docs. I think this is rather standard, except that most driverts configure
> the mode (protocol) at xlate-time. Unlike some other phys where e.g. PCIe
> x4 will use 4 separate phys all configured for PCIe, this driver uses one
> phy configured to use 4 lanes. This is because while the individual lanes
> may be configured individually, the protocol selection acts on all lanes at
> once. Additionally, the order which lanes should be configured in is
> specified by the datasheet.  To coordinate this, lanes are reserved in
> phy_init, and released in phy_exit.
> 
> When getting a phy, if a phy already exists for those lanes, it is reused.
> This is to make things like QSGMII work. Four MACs will all want to ensure
> that the lane is configured properly, and we need to ensure they can all
> call phy_init, etc. There is refcounting for phy_init and phy_power_on, so
> the phy will only be powered on once. However, there is no refcounting for
> phy_set_mode. A "rogue" MAC could set the mode to something non-QSGMII and
> break the other MACs. Perhaps there is an opportunity for future
> enhancement here.
> 
> This driver was written with reference to the LS1046A reference manual.
> However, it was informed by reference manuals for all processors with
> mEMACs, especially the T4240 (which appears to have a "maxed-out"
> configuration).
> 
> Signed-off-by: Sean Anderson <sean.anderson at seco.com>
> ---
> As noted later on in this series (in the phylink conversion patch), this
> driver does not quite function properly. When the bootloader is
> instructed to not configure the SerDes, only one lane comes up.
> 
> Changes in v2:
> - Clear SGMIIaCR1_PCS_EN during probe
> - Fix not clearing group->pll after disabling it
> - Handle 1000Base-KX in lynx_proto_mode_prep
> - Power off lanes during probe
> - Rename LYNX_PROTO_UNKNOWN to LYNX_PROTO_NONE
> - Rename driver to Lynx 10G (etc.)
> - Support 1 and 2 phy-cells
> 
>  Documentation/driver-api/phy/index.rst   |    1 +
>  Documentation/driver-api/phy/qoriq.rst   |   93 ++
>  MAINTAINERS                              |    6 +
>  drivers/phy/freescale/Kconfig            |   19 +
>  drivers/phy/freescale/Makefile           |    1 +
>  drivers/phy/freescale/phy-fsl-lynx-10g.c | 1483 ++++++++++++++++++++++
>  6 files changed, 1603 insertions(+)
>  create mode 100644 Documentation/driver-api/phy/qoriq.rst
>  create mode 100644 drivers/phy/freescale/phy-fsl-lynx-10g.c
> 
> diff --git a/Documentation/driver-api/phy/index.rst b/Documentation/driver-api/phy/index.rst
> index 69ba1216de72..cc7ded8b969c 100644
> --- a/Documentation/driver-api/phy/index.rst
> +++ b/Documentation/driver-api/phy/index.rst
> @@ -7,6 +7,7 @@ Generic PHY Framework
>  .. toctree::
>  
>     phy
> +   qoriq
>     samsung-usb2
>  
>  .. only::  subproject and html
> diff --git a/Documentation/driver-api/phy/qoriq.rst b/Documentation/driver-api/phy/qoriq.rst
> new file mode 100644
> index 000000000000..cbc2ac9ca4aa
> --- /dev/null
> +++ b/Documentation/driver-api/phy/qoriq.rst
> @@ -0,0 +1,93 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +=======================
> +QorIQ SerDes (Lynx 10G)
> +=======================
> +
> +Using this phy
> +--------------
> +
> +The general order of calls should be::
> +
> +    [devm_][of_]phy_get()
> +    phy_init()
> +    phy_power_on()
> +    phy_set_mode[_ext]()
> +    ...
> +    phy_power_off()
> +    phy_exit()
> +    [[of_]phy_put()]

Why is this required here? This should conform to generic phy sequences
as documented in Documentation/driver-api/phy/phy.rst

> +
> +:c:func:`phy_get` just gets (or creates) a new :c:type:`phy` with the lanes
> +described in the phandle. :c:func:`phy_init` is what actually reserves the
> +lanes for use. Unlike some other drivers, when the phy is created, there is no
> +default protocol. :c:func:`phy_set_mode <phy_set_mode_ext>` must be called in
> +order to set the protocol.
> +
> +Supporting SoCs
> +---------------
> +
> +Each new SoC needs a :c:type:`struct lynx_conf <lynx_conf>` for each SerDes.
> +The most important member is `modes`, which is an array of :c:type:`struct
> +lynx_mode <lynx_mode>`. Each "mode" represents a configuration which can be
> +programmed into a protocol control register. Modes can support multiple lanes
> +(such for PCIe x2 or x4), as well as multiple protocols (such as SGMII and
> +1000Base-KX). There are several helper macros to make configuring each mode
> +easier. It is important that the list of modes is complete, even if not all
> +protocols are supported. This lets the driver know which lanes are available,
> +and which have been configured by the RCW.
> +
> +If a protocol is missing, add it to :c:type:`enum lynx_protocol
> +<lynx_protocol>`, and to ``UNSUPPORTED_PROTOS``. If the PCCR shifts/masks for
> +your protocol are missing, you will need to add them to
> +:c:func:`lynx_proto_mode_mask` and :c:func:`lynx_proto_mode_shift`.
> +
> +For example, the configuration for SerDes1 of the LS1046A is::
> +
> +    static const struct lynx_mode ls1046a_modes1[] = {
> +        CONF_SINGLE(1, PCIE, 0x0, 1, 0b001),
> +        CONF_1000BASEKX(0, 0x8, 0, 0b001),
> +        CONF_SGMII25KX(1, 0x8, 1, 0b001),
> +        CONF_SGMII25KX(2, 0x8, 2, 0b001),
> +        CONF_SGMII25KX(3, 0x8, 3, 0b001),
> +        CONF_SINGLE(1, QSGMII, 0x9, 2, 0b001),
> +        CONF_XFI(2, 0xB, 0, 0b010),
> +        CONF_XFI(3, 0xB, 1, 0b001),
> +    };
> +
> +    static const struct lynx_conf ls1046a_conf1 = {
> +        .modes = ls1046a_modes1,
> +        .mode_count = ARRAY_SIZE(ls1046a_modes1),
> +        .lanes = 4,
> +        .endian = REGMAP_ENDIAN_BIG,
> +    };
> +
> +There is an additional set of configuration for SerDes2, which supports a
> +different set of modes. Both configurations should be added to the match
> +table::
> +
> +    { .compatible = "fsl,ls1046-serdes-1", .data = &ls1046a_conf1 },
> +    { .compatible = "fsl,ls1046-serdes-2", .data = &ls1046a_conf2 },
> +
> +Supporting Protocols
> +--------------------
> +
> +Each protocol is a combination of values which must be programmed into the lane
> +registers. To add a new protocol, first add it to :c:type:`enum lynx_protocol
> +<lynx_protocol>`. If it is in ``UNSUPPORTED_PROTOS``, remove it. Add a new
> +entry to `lynx_proto_params`, and populate the appropriate fields. You may need
> +to add some new members to support new fields. Modify `lynx_lookup_proto` to
> +map the :c:type:`enum phy_mode <phy_mode>` to :c:type:`enum lynx_protocol
> +<lynx_protocol>`. Ensure that :c:func:`lynx_proto_mode_mask` and
> +:c:func:`lynx_proto_mode_shift` have been updated with support for your
> +protocol.
> +
> +You may need to modify :c:func:`lynx_set_mode` in order to support your
> +procotol. This can happen when you have added members to :c:type:`struct
> +lynx_proto_params <lynx_proto_params>`. It can also happen if you have specific
> +clocking requirements, or protocol-specific registers to program.
> +
> +Internal API Reference
> +----------------------
> +
> +.. kernel-doc:: drivers/phy/freescale/phy-fsl-lynx-10g.c
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ca95b1833b97..ef65e2acdb48 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -7977,6 +7977,12 @@ F:	drivers/ptp/ptp_qoriq.c
>  F:	drivers/ptp/ptp_qoriq_debugfs.c
>  F:	include/linux/fsl/ptp_qoriq.h
>  
> +FREESCALE QORIQ SERDES DRIVER
> +M:	Sean Anderson <sean.anderson at seco.com>
> +S:	Maintained
> +F:	Documentation/driver-api/phy/qoriq.rst
> +F:	drivers/phy/freescale/phy-qoriq.c
> +
>  FREESCALE QUAD SPI DRIVER
>  M:	Han Xu <han.xu at nxp.com>
>  L:	linux-spi at vger.kernel.org
> diff --git a/drivers/phy/freescale/Kconfig b/drivers/phy/freescale/Kconfig
> index f9c54cd02036..857b4d123515 100644
> --- a/drivers/phy/freescale/Kconfig
> +++ b/drivers/phy/freescale/Kconfig
> @@ -38,3 +38,22 @@ config PHY_FSL_LYNX_28G
>  	  found on NXP's Layerscape platforms such as LX2160A.
>  	  Used to change the protocol running on SerDes lanes at runtime.
>  	  Only useful for a restricted set of Ethernet protocols.
> +
> +config PHY_FSL_LYNX_10G
> +	tristate "Freescale Layerscale Lynx 10G SerDes support"
> +	select GENERIC_PHY
> +	select REGMAP_MMIO
> +	help
> +	  This adds support for the Lynx "SerDes" devices found on various QorIQ
> +	  SoCs. There may be up to four SerDes devices on each SoC, and each
> +	  device supports up to eight lanes. The SerDes is configured by default
> +	  by the RCW, but this module is necessary in order to support dynamic
> +	  reconfiguration (such as to support 1G and 10G ethernet on the same
> +	  interface). The hardware supports a variety of protocols, including
> +	  Ethernet, SATA, PCIe, and more exotic links such as Interlaken and
> +	  Aurora. This driver only supports Ethernet, but it will try not to
> +	  touch lanes configured for other protocols.
> +
> +	  If you have a QorIQ processor and want to dynamically reconfigure your
> +	  SerDes, say Y. If this driver is compiled as a module, it will be
> +	  named phy-qoriq.
> diff --git a/drivers/phy/freescale/Makefile b/drivers/phy/freescale/Makefile
> index 3518d5dbe8a7..aa4374ed217c 100644
> --- a/drivers/phy/freescale/Makefile
> +++ b/drivers/phy/freescale/Makefile
> @@ -2,4 +2,5 @@
>  obj-$(CONFIG_PHY_FSL_IMX8MQ_USB)	+= phy-fsl-imx8mq-usb.o
>  obj-$(CONFIG_PHY_MIXEL_MIPI_DPHY)	+= phy-fsl-imx8-mipi-dphy.o
>  obj-$(CONFIG_PHY_FSL_IMX8M_PCIE)	+= phy-fsl-imx8m-pcie.o
> +obj-$(CONFIG_PHY_FSL_LYNX_10G)		+= phy-fsl-lynx-10g.o
>  obj-$(CONFIG_PHY_FSL_LYNX_28G)		+= phy-fsl-lynx-28g.o
> diff --git a/drivers/phy/freescale/phy-fsl-lynx-10g.c b/drivers/phy/freescale/phy-fsl-lynx-10g.c
> new file mode 100644
> index 000000000000..480bd493fbc2
> --- /dev/null
> +++ b/drivers/phy/freescale/phy-fsl-lynx-10g.c
> @@ -0,0 +1,1483 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2022 Sean Anderson <sean.anderson at seco.com>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/math64.h>
> +#include <linux/platform_device.h>
> +#include <linux/phy.h>
> +#include <linux/phy/phy.h>
> +#include <linux/regmap.h>
> +#include <linux/units.h>
> +
> +#define PLL_STRIDE	0x20
> +#define PLLa(a, off)	((a) * PLL_STRIDE + (off))
> +#define PLLaRSTCTL(a)	PLLa(a, 0x00)
> +#define PLLaCR0(a)	PLLa(a, 0x04)
> +
> +#define PLLaRSTCTL_RSTREQ	BIT(31)
> +#define PLLaRSTCTL_RST_DONE	BIT(30)
> +#define PLLaRSTCTL_RST_ERR	BIT(29)
> +#define PLLaRSTCTL_PLLRST_B	BIT(7)
> +#define PLLaRSTCTL_SDRST_B	BIT(6)
> +#define PLLaRSTCTL_SDEN		BIT(5)
> +
> +#define PLLaCR0_POFF		BIT(31)
> +#define PLLaCR0_RFCLK_SEL	GENMASK(30, 28)
> +#define PLLaCR0_PLL_LCK		BIT(23)
> +#define PLLaCR0_FRATE_SEL	GENMASK(19, 16)
> +#define PLLaCR0_DLYDIV_SEL	GENMASK(1, 0)
> +
> +#define PCCR_BASE	0x200
> +#define PCCR_STRIDE	0x4
> +#define PCCRn(n)	(PCCR_BASE + n * PCCR_STRIDE)
> +
> +#define PCCR0_PEXa_MASK		GENMASK(2, 0)
> +#define PCCR0_PEXa_SHIFT(a)	(28 - (a) * 4)

use FIELD_GET/PREP instead of defining shifts? That would use MASK to
extract/set the field

> +
> +#define PCCR2_SATAa_MASK	GENMASK(2, 0)
> +#define PCCR2_SATAa_SHIFT(a)	(28 - (a) * 4)
> +
> +#define PCCR8_SGMIIa_KX		BIT(3)
> +#define PCCR8_SGMIIa_MASK	GENMASK(3, 0)
> +#define PCCR8_SGMIIa_SHIFT(a)	(28 - (a) * 4)
> +
> +#define PCCR9_QSGMIIa_MASK	GENMASK(2, 0)
> +#define PCCR9_QSGMIIa_SHIFT(a)	(28 - (a) * 4)
> +
> +#define PCCRB_XFIa_MASK		GENMASK(2, 0)
> +#define PCCRB_XFIa_SHIFT(a)	(28 - (a) * 4)
> +
> +#define LANE_BASE	0x800
> +#define LANE_STRIDE	0x40
> +#define LNm(m, off)	(LANE_BASE + (m) * LANE_STRIDE + (off))
> +#define LNmGCR0(m)	LNm(m, 0x00)
> +#define LNmGCR1(m)	LNm(m, 0x04)
> +#define LNmSSCR0(m)	LNm(m, 0x0C)
> +#define LNmRECR0(m)	LNm(m, 0x10)
> +#define LNmRECR1(m)	LNm(m, 0x14)
> +#define LNmTECR0(m)	LNm(m, 0x18)
> +#define LNmSSCR1(m)	LNm(m, 0x1C)
> +#define LNmTTLCR0(m)	LNm(m, 0x20)
> +
> +#define LNmGCR0_RPLL_LES	BIT(31)
> +#define LNmGCR0_RRAT_SEL	GENMASK(29, 28)
> +#define LNmGCR0_TPLL_LES	BIT(27)
> +#define LNmGCR0_TRAT_SEL	GENMASK(25, 24)
> +#define LNmGCR0_RRST_B		BIT(22)
> +#define LNmGCR0_TRST_B		BIT(21)
> +#define LNmGCR0_RX_PD		BIT(20)
> +#define LNmGCR0_TX_PD		BIT(19)
> +#define LNmGCR0_IF20BIT_EN	BIT(18)
> +#define LNmGCR0_FIRST_LANE	BIT(16)
> +#define LNmGCR0_TTRM_VM_SEL	GENMASK(13, 12)
> +#define LNmGCR0_PROTS		GENMASK(11, 7)
> +
> +#define LNmGCR0_RAT_SEL_SAME		0b00
> +#define LNmGCR0_RAT_SEL_HALF		0b01
> +#define LNmGCR0_RAT_SEL_QUARTER		0b10
> +#define LNmGCR0_RAT_SEL_DOUBLE		0b11
> +
> +#define LNmGCR0_PROTS_PCIE		0b00000
> +#define LNmGCR0_PROTS_SGMII		0b00001
> +#define LNmGCR0_PROTS_SATA		0b00010
> +#define LNmGCR0_PROTS_XFI		0b01010
> +
> +#define LNmGCR1_RDAT_INV	BIT(31)
> +#define LNmGCR1_TDAT_INV	BIT(30)
> +#define LNmGCR1_OPAD_CTL	BIT(26)
> +#define LNmGCR1_REIDL_TH	GENMASK(22, 20)
> +#define LNmGCR1_REIDL_EX_SEL	GENMASK(19, 18)
> +#define LNmGCR1_REIDL_ET_SEL	GENMASK(17, 16)
> +#define LNmGCR1_REIDL_EX_MSB	BIT(15)
> +#define LNmGCR1_REIDL_ET_MSB	BIT(14)
> +#define LNmGCR1_REQ_CTL_SNP	BIT(13)
> +#define LNmGCR1_REQ_CDR_SNP	BIT(12)
> +#define LNmGCR1_TRSTDIR		BIT(7)
> +#define LNmGCR1_REQ_BIN_SNP	BIT(6)
> +#define LNmGCR1_ISLEW_RCTL	GENMASK(5, 4)
> +#define LNmGCR1_OSLEW_RCTL	GENMASK(1, 0)
> +
> +#define LNmRECR0_GK2OVD		GENMASK(27, 24)
> +#define LNmRECR0_GK3OVD		GENMASK(19, 16)
> +#define LNmRECR0_GK2OVD_EN	BIT(15)
> +#define LNmRECR0_GK3OVD_EN	BIT(16)
> +#define LNmRECR0_BASE_WAND	GENMASK(11, 10)
> +#define LNmRECR0_OSETOVD	GENMASK(5, 0)
> +
> +#define LNmRECR0_BASE_WAND_OFF		0b00
> +#define LNmRECR0_BASE_WAND_DEFAULT	0b01
> +#define LNmRECR0_BASE_WAND_ALTERNATE	0b10
> +#define LNmRECR0_BASE_WAND_OSETOVD	0b11
> +
> +#define LNmTECR0_TEQ_TYPE	GENMASK(29, 28)
> +#define LNmTECR0_SGN_PREQ	BIT(26)
> +#define LNmTECR0_RATIO_PREQ	GENMASK(25, 22)
> +#define LNmTECR0_SGN_POST1Q	BIT(21)
> +#define LNmTECR0_RATIO_PST1Q	GENMASK(20, 16)
> +#define LNmTECR0_ADPT_EQ	GENMASK(13, 8)
> +#define LNmTECR0_AMP_RED	GENMASK(5, 0)
> +
> +#define LNmTECR0_TEQ_TYPE_NONE		0b00
> +#define LNmTECR0_TEQ_TYPE_PRE		0b01
> +#define LNmTECR0_TEQ_TYPE_BOTH		0b10
> +
> +#define LNmTTLCR0_FLT_SEL	GENMASK(29, 24)
> +
> +#define PCS_STRIDE	0x10
> +#define CR_STRIDE	0x4
> +#define PCSa(a, base, cr)	(base + (a) * PCS_STRIDE + (cr) * CR_STRIDE)
> +
> +#define PCSaCR1_MDEV_PORT	GENMASK(31, 27)
> +
> +#define SGMII_BASE	0x1800
> +#define SGMIIaCR1(a)	PCSa(a, SGMII_BASE, 1)
> +
> +#define SGMIIaCR1_SGPCS_EN	BIT(11)
> +
> +#define QSGMII_OFFSET	0x1880
> +#define QSGMIIaCR1(a)	PCSa(a, QSGMII_BASE, 1)
> +
> +#define XFI_OFFSET	0x1980
> +#define XFIaCR1(a)	PCSa(a, XFI_BASE, 1)
> +
> +/* The maximum number of lanes in a single serdes */
> +#define MAX_LANES	8
> +
> +enum lynx_protocol {
> +	LYNX_PROTO_NONE = 0,
> +	LYNX_PROTO_SGMII,
> +	LYNX_PROTO_SGMII25,
> +	LYNX_PROTO_1000BASEKX,
> +	LYNX_PROTO_QSGMII,
> +	LYNX_PROTO_XFI,
> +	LYNX_PROTO_10GKR,
> +	LYNX_PROTO_PCIE, /* Not implemented */
> +	LYNX_PROTO_SATA, /* Not implemented */

lets skip that and add when it is implemented

> +	LYNX_PROTO_LAST,
> +};
> +
> +static const char lynx_proto_str[][16] = {
> +	[LYNX_PROTO_NONE] = "unknown",
> +	[LYNX_PROTO_SGMII] = "SGMII",
> +	[LYNX_PROTO_SGMII25] = "2.5G SGMII",
> +	[LYNX_PROTO_1000BASEKX] = "1000Base-KX",
> +	[LYNX_PROTO_QSGMII] = "QSGMII",
> +	[LYNX_PROTO_XFI] = "XFI",
> +	[LYNX_PROTO_10GKR] = "10GBase-KR",
> +	[LYNX_PROTO_PCIE] = "PCIe",
> +	[LYNX_PROTO_SATA] = "SATA",
> +};
> +
> +#define PROTO_MASK(proto) BIT(LYNX_PROTO_##proto)
> +#define UNSUPPORTED_PROTOS (PROTO_MASK(SATA) | PROTO_MASK(PCIE))
> +
> +/**
> + * struct lynx_proto_params - Parameters for configuring a protocol
> + * @frate_khz: The PLL rate, in kHz
> + * @rat_sel: The divider to get the line rate
> + * @if20bit: Whether the proto is 20 bits or 10 bits
> + * @prots: Lane protocol select
> + * @reidl_th: Receiver electrical idle detection threshold
> + * @reidl_ex: Exit electrical idle filter
> + * @reidl_et: Enter idle filter
> + * @slew: Slew control
> + * @baseline_wander: Enable baseline wander correction
> + * @gain: Adaptive equalization gain override
> + * @offset_override: Adaptive equalization offset override
> + * @teq: Transmit equalization type (none, precursor, or precursor and
> + *       postcursor). The next few values are only used for appropriate
> + *       equalization types.
> + * @preq_ratio: Ratio of full swing transition bit to pre-cursor
> + * @postq_ratio: Ratio of full swing transition bit to first post-cursor.
> + * @adpt_eq: Transmitter Adjustments for 8G/10G
> + * @amp_red: Overall TX Amplitude Reduction
> + * @flt_sel: TTL configuration selector
> + */
> +struct lynx_proto_params {
> +	u32 frate_khz;
> +	u8 rat_sel;
> +	u8 prots;
> +	u8 reidl_th;
> +	u8 reidl_ex;
> +	u8 reidl_et;
> +	u8 slew;
> +	u8 gain;
> +	u8 baseline_wander;
> +	u8 offset_override;
> +	u8 teq;
> +	u8 preq_ratio;
> +	u8 postq_ratio;
> +	u8 adpt_eq;
> +	u8 amp_red;
> +	u8 flt_sel;
> +	bool if20bit;
> +};
> +
> +static const struct lynx_proto_params lynx_proto_params[] = {
> +	[LYNX_PROTO_SGMII] = {
> +		.frate_khz = 5000000,
> +		.rat_sel = LNmGCR0_RAT_SEL_QUARTER,
> +		.if20bit = false,
> +		.prots = LNmGCR0_PROTS_SGMII,
> +		.reidl_th = 0b001,
> +		.reidl_ex = 0b011,
> +		.reidl_et = 0b100,
> +		.slew = 0b01,
> +		.gain = 0b1111,
> +		.offset_override = 0b0011111,
> +		.teq = LNmTECR0_TEQ_TYPE_NONE,
> +		.adpt_eq = 0b110000,
> +		.amp_red = 0b000110,
> +		.flt_sel = 0b111001,
> +	},
> +	[LYNX_PROTO_1000BASEKX] = {
> +		.frate_khz = 5000000,
> +		.rat_sel = LNmGCR0_RAT_SEL_QUARTER,
> +		.if20bit = false,
> +		.prots = LNmGCR0_PROTS_SGMII,
> +		.slew = 0b01,
> +		.gain = 0b1111,
> +		.offset_override = 0b0011111,
> +		.teq = LNmTECR0_TEQ_TYPE_NONE,
> +		.adpt_eq = 0b110000,
> +		.flt_sel = 0b111001,
> +	},
> +	[LYNX_PROTO_SGMII25] = {
> +		.frate_khz = 3125000,
> +		.rat_sel = LNmGCR0_RAT_SEL_SAME,
> +		.if20bit = false,
> +		.prots = LNmGCR0_PROTS_SGMII,
> +		.slew = 0b10,
> +		.offset_override = 0b0011111,
> +		.teq = LNmTECR0_TEQ_TYPE_PRE,
> +		.postq_ratio = 0b00110,
> +		.adpt_eq = 0b110000,
> +	},
> +	[LYNX_PROTO_QSGMII] = {
> +		.frate_khz = 5000000,
> +		.rat_sel = LNmGCR0_RAT_SEL_SAME,
> +		.if20bit = true,
> +		.prots = LNmGCR0_PROTS_SGMII,
> +		.slew = 0b01,
> +		.offset_override = 0b0011111,
> +		.teq = LNmTECR0_TEQ_TYPE_PRE,
> +		.postq_ratio = 0b00110,
> +		.adpt_eq = 0b110000,
> +		.amp_red = 0b000010,
> +	},
> +	[LYNX_PROTO_XFI] = {
> +		.frate_khz = 5156250,
> +		.rat_sel = LNmGCR0_RAT_SEL_DOUBLE,
> +		.if20bit = true,
> +		.prots = LNmGCR0_PROTS_XFI,
> +		.slew = 0b01,
> +		.baseline_wander = LNmRECR0_BASE_WAND_DEFAULT,
> +		.offset_override = 0b1011111,
> +		.teq = LNmTECR0_TEQ_TYPE_PRE,
> +		.postq_ratio = 0b00011,
> +		.adpt_eq = 0b110000,
> +		.amp_red = 0b000111,
> +	},
> +	[LYNX_PROTO_10GKR] = {
> +		.frate_khz = 5156250,
> +		.rat_sel = LNmGCR0_RAT_SEL_DOUBLE,
> +		.prots = LNmGCR0_PROTS_XFI,
> +		.slew = 0b01,
> +		.baseline_wander = LNmRECR0_BASE_WAND_DEFAULT,
> +		.offset_override = 0b1011111,
> +		.teq = LNmTECR0_TEQ_TYPE_BOTH,
> +		.preq_ratio = 0b0011,
> +		.postq_ratio = 0b01100,
> +		.adpt_eq = 0b110000,
> +	},
> +};
> +
> +/**
> + * struct lynx_mode - A single configuration of a protocol controller
> + * @protos: A bitmask of the &enum lynx_protocol this mode supports
> + * @lanes: A bitmask of the lanes which will be used when this config is
> + *         selected
> + * @pccr: The number of the PCCR which contains this mode
> + * @idx: The index of the protocol controller. For example, SGMIIB would have
> + *       index 1.
> + * @cfg: The value to program into the controller to select this mode
> + *
> + * The serdes has multiple protocol controllers which can be each be selected
> + * independently. Depending on their configuration, they may use multiple lanes
> + * at once (e.g. AUI or PCIe x4). Additionally, multiple protocols may be
> + * supported by a single mode (XFI and 10GKR differ only in their protocol
> + * parameters).
> + */
> +struct lynx_mode {
> +	u16 protos;
> +	u8 lanes;
> +	u8 pccr;
> +	u8 idx;
> +	u8 cfg;
> +};
> +
> +static_assert(LYNX_PROTO_LAST - 1 <=
> +	      sizeof_field(struct lynx_mode, protos) * BITS_PER_BYTE);
> +static_assert(MAX_LANES <=
> +	      sizeof_field(struct lynx_mode, lanes) * BITS_PER_BYTE);
> +
> +#define CONF(_lanes, _protos, _pccr, _idx, _cfg) { \
> +	.lanes = _lanes, \
> +	.protos = _protos, \
> +	.pccr = _pccr, \
> +	.idx = _idx, \
> +	.cfg = _cfg, \
> +}
> +
> +#define CONF_SINGLE(lane, proto, pccr, idx, cfg) \
> +	CONF(BIT(lane), PROTO_MASK(proto), pccr, idx, cfg)
> +
> +#define CONF_1000BASEKX(lane, pccr, idx, cfg) \
> +	CONF(BIT(lane), PROTO_MASK(SGMII) | PROTO_MASK(1000BASEKX), \
> +	     pccr, idx, cfg)
> +
> +#define CONF_SGMII25(lane, pccr, idx, cfg) \
> +	CONF(BIT(lane), PROTO_MASK(SGMII) | PROTO_MASK(SGMII25), \
> +	     pccr, idx, cfg)
> +
> +#define CONF_SGMII25KX(lane, pccr, idx, cfg) \
> +	CONF(BIT(lane), \
> +	     PROTO_MASK(SGMII) | PROTO_MASK(1000BASEKX) | PROTO_MASK(SGMII25), \
> +	     pccr, idx, cfg)
> +
> +#define CONF_XFI(lane, pccr, idx, cfg) \
> +	CONF(BIT(lane), PROTO_MASK(XFI) | PROTO_MASK(10GKR), pccr, idx, cfg)
> +
> +/**
> + * struct lynx_conf - Configuration for a particular serdes
> + * @modes: Valid protocol controller configurations
> + * @mode_count: Number of modes in @modes
> + * @lanes: Number of lanes
> + * @endian: Endianness of the registers
> + */
> +struct lynx_conf {
> +	const struct lynx_mode *modes;
> +	size_t mode_count;
> +	unsigned int lanes;
> +	enum regmap_endian endian;
> +};
> +
> +struct lynx_priv;
> +
> +/**
> + * struct lynx_clk - Driver data for the PLLs
> + * @hw: The clock hardware
> + * @serdes: The parent serdes
> + * @idx: Which PLL this clock is for
> + */
> +struct lynx_clk {
> +	struct clk_hw hw;
> +	struct lynx_priv *serdes;
> +	unsigned int idx;
> +};
> +
> +static struct lynx_clk *lynx_clk_hw_to_priv(struct clk_hw *hw)
> +{
> +	return container_of(hw, struct lynx_clk, hw);
> +}
> +
> +/**
> + * struct lynx_priv - Driver data for the serdes
> + * @lock: A lock protecting "common" registers in @regmap, as well as the
> + *        members of this struct. Lane-specific registers are protected by the
> + *        phy's lock. PLL registers are protected by the clock's lock.
> + * @pll: The PLL clocks
> + * @ref: The reference clocks for the PLLs
> + * @dev: The serdes device
> + * @regmap: The backing regmap
> + * @conf: The configuration for this serdes
> + * @used_lanes: Bitmap of the lanes currently used by phys
> + * @groups: List of the created groups
> + */
> +struct lynx_priv {
> +	struct mutex lock;
> +	struct lynx_clk pll[2];
> +	struct clk *ref[2];
> +	struct device *dev;
> +	struct regmap *regmap;
> +	const struct lynx_conf *conf;
> +	unsigned int used_lanes;
> +	struct list_head groups;
> +};
> +
> +/**
> + * struct lynx_group - Driver data for a group of lanes
> + * @groups: List of other groups; protected by @serdes->lock.
> + * @phy: The associated phy
> + * @serdes: The parent serdes
> + * @pll: The currently-used pll
> + * @first_lane: The first lane in the group
> + * @last_lane: The last lane in the group
> + * @proto: The currently-configured protocol
> + * @users: Number of current users; protected by @serdes->lock.
> + */
> +struct lynx_group {
> +	struct list_head groups;
> +	struct phy *phy;
> +	struct lynx_priv *serdes;
> +	struct clk *pll;
> +	unsigned int first_lane;
> +	unsigned int last_lane;
> +	enum lynx_protocol proto;
> +	unsigned int users;
> +};
> +
> +static u32 lynx_read(struct lynx_priv *serdes, u32 reg)
> +{
> +	unsigned int ret = 0;
> +
> +	WARN_ON_ONCE(regmap_read(serdes->regmap, reg, &ret));
> +	return ret;
> +}
> +
> +static void lynx_write(struct lynx_priv *serdes, u32 val, u32 reg)
> +{
> +	WARN_ON_ONCE(regmap_write(serdes->regmap, reg, val));
> +}
> +
> +/* XXX: The output rate is in kHz to avoid overflow on 32-bit arches */
> +
> +static void lynx_pll_disable(struct clk_hw *hw)
> +{
> +	struct lynx_clk *clk = lynx_clk_hw_to_priv(hw);
> +	struct lynx_priv *serdes = clk->serdes;
> +	u32 rstctl = lynx_read(serdes, PLLaRSTCTL(clk->idx));
> +
> +	dev_dbg(clk->serdes->dev, "%s(pll%d)\n", __func__, clk->idx);

no need for __func__ in dev_dbg pls

> +
> +	rstctl &= ~PLLaRSTCTL_SDRST_B;
> +	lynx_write(serdes, rstctl, PLLaRSTCTL(clk->idx));
> +	ndelay(50);
> +	rstctl &= ~(PLLaRSTCTL_SDEN | PLLaRSTCTL_PLLRST_B);
> +	lynx_write(serdes, rstctl, PLLaRSTCTL(clk->idx));
> +	ndelay(100);
> +}
> +
> +static int lynx_pll_enable(struct clk_hw *hw)
> +{
> +	struct lynx_clk *clk = lynx_clk_hw_to_priv(hw);
> +	struct lynx_priv *serdes = clk->serdes;
> +	u32 rstctl = lynx_read(serdes, PLLaRSTCTL(clk->idx));
> +
> +	dev_dbg(clk->serdes->dev, "%s(pll%d)\n", __func__, clk->idx);
> +
> +	rstctl |= PLLaRSTCTL_RSTREQ;
> +	lynx_write(serdes, rstctl, PLLaRSTCTL(clk->idx));
> +
> +	rstctl &= ~PLLaRSTCTL_RSTREQ;
> +	rstctl |= PLLaRSTCTL_SDEN | PLLaRSTCTL_PLLRST_B | PLLaRSTCTL_SDRST_B;
> +	lynx_write(serdes, rstctl, PLLaRSTCTL(clk->idx));
> +
> +	/* TODO: wait for the PLL to lock */

when will this be added?

> +
> +	return 0;
> +}
> +
> +static int lynx_pll_is_enabled(struct clk_hw *hw)
> +{
> +	struct lynx_clk *clk = lynx_clk_hw_to_priv(hw);
> +	struct lynx_priv *serdes = clk->serdes;
> +	u32 rstctl = lynx_read(serdes, PLLaRSTCTL(clk->idx));
> +
> +	dev_dbg(clk->serdes->dev, "%s(pll%d)\n", __func__, clk->idx);
> +
> +	return rstctl & PLLaRSTCTL_RST_DONE && !(rstctl & PLLaRSTCTL_RST_ERR);
> +}
> +
> +static const u32 rfclk_sel_map[8] = {
> +	[0b000] = 100000000,
> +	[0b001] = 125000000,
> +	[0b010] = 156250000,
> +	[0b011] = 150000000,
> +};
> +
> +/**
> + * lynx_rfclk_to_sel() - Convert a reference clock rate to a selector
> + * @rate: The reference clock rate
> + *
> + * To allow for some variation in the reference clock rate, up to 100ppm of
> + * error is allowed.
> + *
> + * Return: An appropriate selector for @rate, or -%EINVAL.
> + */
> +static int lynx_rfclk_to_sel(u32 rate)
> +{
> +	int ret;
> +
> +	for (ret = 0; ret < ARRAY_SIZE(rfclk_sel_map); ret++) {
> +		u32 rfclk_rate = rfclk_sel_map[ret];
> +		/* Allow an error of 100ppm */
> +		u32 error = rfclk_rate / 10000;
> +
> +		if (rate > rfclk_rate - error && rate < rfclk_rate + error)
> +			return ret;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static const u32 frate_sel_map[16] = {
> +	[0b0000] = 5000000,
> +	[0b0101] = 3750000,
> +	[0b0110] = 5156250,
> +	[0b0111] = 4000000,
> +	[0b1001] = 3125000,
> +	[0b1010] = 3000000,
> +};
> +
> +/**
> + * lynx_frate_to_sel() - Convert a VCO clock rate to a selector
> + * @rate_khz: The VCO frequency, in kHz
> + *
> + * Return: An appropriate selector for @rate_khz, or -%EINVAL.
> + */
> +static int lynx_frate_to_sel(u32 rate_khz)
> +{
> +	int ret;
> +
> +	for (ret = 0; ret < ARRAY_SIZE(frate_sel_map); ret++)
> +		if (frate_sel_map[ret] == rate_khz)
> +			return ret;
> +
> +	return -EINVAL;
> +}
> +
> +static u32 lynx_pll_ratio(u32 frate_sel, u32 rfclk_sel)
> +{
> +	u64 frate;
> +	u32 rfclk, error, ratio;
> +
> +	frate = frate_sel_map[frate_sel] * (u64)HZ_PER_KHZ;
> +	rfclk = rfclk_sel_map[rfclk_sel];
> +
> +	if (!frate || !rfclk)
> +		return 0;
> +
> +	ratio = div_u64_rem(frate, rfclk, &error);
> +	if (!error)
> +		return ratio;
> +	return 0;
> +}
> +
> +static unsigned long lynx_pll_recalc_rate(struct clk_hw *hw,
> +					unsigned long parent_rate)
> +{
> +	struct lynx_clk *clk = lynx_clk_hw_to_priv(hw);
> +	struct lynx_priv *serdes = clk->serdes;
> +	u32 cr0 = lynx_read(serdes, PLLaCR0(clk->idx));
> +	u32 frate_sel = FIELD_GET(PLLaCR0_FRATE_SEL, cr0);
> +	u32 rfclk_sel = FIELD_GET(PLLaCR0_RFCLK_SEL, cr0);
> +	unsigned long ret;
> +
> +	dev_dbg(clk->serdes->dev, "%s(pll%d, %lu)\n", __func__,
> +		clk->idx, parent_rate);
> +
> +	ret = mult_frac(parent_rate, lynx_pll_ratio(frate_sel, rfclk_sel),
> +			 HZ_PER_KHZ);
> +	return ret;
> +}
> +
> +static long lynx_pll_round_rate(struct clk_hw *hw, unsigned long rate_khz,
> +			      unsigned long *parent_rate)
> +{
> +	int frate_sel, rfclk_sel;
> +	struct lynx_clk *clk = lynx_clk_hw_to_priv(hw);
> +	u32 ratio;
> +
> +	dev_dbg(clk->serdes->dev, "%s(pll%d, %lu, %lu)\n", __func__,
> +		clk->idx, rate_khz, *parent_rate);
> +
> +	frate_sel = lynx_frate_to_sel(rate_khz);
> +	if (frate_sel < 0)
> +		return frate_sel;
> +
> +	rfclk_sel = lynx_rfclk_to_sel(*parent_rate);
> +	if (rfclk_sel >= 0) {
> +		ratio = lynx_pll_ratio(frate_sel, rfclk_sel);
> +		if (ratio)
> +			return mult_frac(*parent_rate, ratio, HZ_PER_KHZ);
> +	}
> +
> +	for (rfclk_sel = 0;
> +	     rfclk_sel < ARRAY_SIZE(rfclk_sel_map);
> +	     rfclk_sel++) {
> +		ratio = lynx_pll_ratio(frate_sel, rfclk_sel);
> +		if (ratio) {
> +			*parent_rate = rfclk_sel_map[rfclk_sel];
> +			return mult_frac(*parent_rate, ratio, HZ_PER_KHZ);
> +		}
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int lynx_pll_set_rate(struct clk_hw *hw, unsigned long rate_khz,
> +			   unsigned long parent_rate)

This really sounds like a clk driver, why is this in phy driver. Ideally
this should a clock driver. Please move it to one..

> +{
> +	int frate_sel, rfclk_sel, ret;
> +	struct lynx_clk *clk = lynx_clk_hw_to_priv(hw);
> +	struct lynx_priv *serdes = clk->serdes;
> +	u32 ratio, cr0 = lynx_read(serdes, PLLaCR0(clk->idx));
> +
> +	dev_dbg(clk->serdes->dev, "%s(pll%d, %lu, %lu)\n", __func__,
> +		clk->idx, rate_khz, parent_rate);
> +
> +	frate_sel = lynx_frate_to_sel(rate_khz);
> +	if (frate_sel < 0)
> +		return frate_sel;
> +
> +	/* First try the existing rate */
> +	rfclk_sel = lynx_rfclk_to_sel(parent_rate);
> +	if (rfclk_sel >= 0) {
> +		ratio = lynx_pll_ratio(frate_sel, rfclk_sel);
> +		if (ratio)
> +			goto got_rfclk;
> +	}
> +
> +	for (rfclk_sel = 0;
> +	     rfclk_sel < ARRAY_SIZE(rfclk_sel_map);
> +	     rfclk_sel++) {
> +		ratio = lynx_pll_ratio(frate_sel, rfclk_sel);
> +		if (ratio) {
> +			ret = clk_set_rate(serdes->ref[clk->idx],
> +					   rfclk_sel_map[rfclk_sel]);
> +			if (!ret)
> +				goto got_rfclk;
> +		}
> +	}
> +
> +	return ret;
> +
> +got_rfclk:
> +	cr0 &= ~(PLLaCR0_RFCLK_SEL | PLLaCR0_FRATE_SEL);
> +	cr0 |= FIELD_PREP(PLLaCR0_RFCLK_SEL, rfclk_sel);
> +	cr0 |= FIELD_PREP(PLLaCR0_FRATE_SEL, frate_sel);
> +	lynx_write(serdes, cr0, PLLaCR0(clk->idx));
> +	return 0;
> +}
> +
> +static const struct clk_ops lynx_pll_clk_ops = {
> +	.enable = lynx_pll_enable,
> +	.disable = lynx_pll_disable,
> +	.is_enabled = lynx_pll_is_enabled,
> +	.recalc_rate = lynx_pll_recalc_rate,
> +	.round_rate = lynx_pll_round_rate,
> +	.set_rate = lynx_pll_set_rate,
> +};

right, this should be a clk driver

> +
> +static struct clk_hw *lynx_clk_get(struct of_phandle_args *clkspec, void *data)
> +{
> +	struct lynx_priv *serdes = data;
> +
> +	if (clkspec->args_count != 1)
> +		return ERR_PTR(-EINVAL);
> +
> +	if (clkspec->args[0] > 1)
> +		return ERR_PTR(-EINVAL);
> +
> +	return &serdes->pll[clkspec->args[0]].hw;
> +}
> +
> +/**
> + * lynx_lane_bitmap() - Get a bitmap for a group of lanes
> + * @group: The group of lanes
> + *
> + * Return: A mask containing all bits between @group->first and @group->last
> + */
> +static unsigned int lynx_lane_bitmap(struct lynx_group *group)
> +{
> +	if (group->first_lane > group->last_lane)
> +		return GENMASK(group->first_lane, group->last_lane);
> +	else
> +		return GENMASK(group->last_lane, group->first_lane);
> +}
> +
> +static int lynx_init(struct phy *phy)
> +{
> +	int ret = 0;
> +	struct lynx_group *group = phy_get_drvdata(phy);
> +	struct lynx_priv *serdes = group->serdes;
> +	unsigned int lane_mask = lynx_lane_bitmap(group);
> +
> +	mutex_lock(&serdes->lock);
> +	if (serdes->used_lanes & lane_mask)
> +		ret = -EBUSY;
> +	else
> +		serdes->used_lanes |= lane_mask;
> +	mutex_unlock(&serdes->lock);
> +	return ret;
> +}
> +
> +static int lynx_exit(struct phy *phy)
> +{
> +	struct lynx_group *group = phy_get_drvdata(phy);
> +	struct lynx_priv *serdes = group->serdes;
> +
> +	clk_disable_unprepare(group->pll);
> +	clk_rate_exclusive_put(group->pll);
> +	group->pll = NULL;
> +
> +	mutex_lock(&serdes->lock);
> +	serdes->used_lanes &= ~lynx_lane_bitmap(group);
> +	mutex_unlock(&serdes->lock);
> +	return 0;
> +}
> +
> +/*
> + * This is tricky. If first_lane=1 and last_lane=0, the condition will see 2,
> + * 1, 0. But the loop body will see 1, 0. We do this to avoid underflow. We
> + * can't pull the same trick when incrementing, because then we might have to
> + * start at -1 if (e.g.) first_lane = 0.
> + */
> +#define for_range(val, start, end) \
> +	for (val = start < end ? start : start + 1; \
> +	     start < end ? val <= end : val-- > end; \
> +	     start < end ? val++ : 0)
> +#define for_each_lane(lane, group) \
> +	for_range(lane, group->first_lane, group->last_lane)
> +#define for_each_lane_reverse(lane, group) \
> +	for_range(lane, group->last_lane, group->first_lane)
> +
> +static int lynx_power_on(struct phy *phy)
> +{
> +	int i;
> +	struct lynx_group *group = phy_get_drvdata(phy);
> +	u32 gcr0;
> +
> +	for_each_lane(i, group) {
> +		gcr0 = lynx_read(group->serdes, LNmGCR0(i));
> +		gcr0 &= ~(LNmGCR0_RX_PD | LNmGCR0_TX_PD);
> +		lynx_write(group->serdes, gcr0, LNmGCR0(i));
> +
> +		usleep_range(15, 30);
> +		gcr0 |= LNmGCR0_RRST_B | LNmGCR0_TRST_B;
> +		lynx_write(group->serdes, gcr0, LNmGCR0(i));
> +	}
> +
> +	return 0;
> +}
> +
> +static void lynx_power_off_lane(struct lynx_priv *serdes, unsigned int lane)
> +{
> +	u32 gcr0 = lynx_read(serdes, LNmGCR0(lane));
> +
> +	gcr0 |= LNmGCR0_RX_PD | LNmGCR0_TX_PD;
> +	gcr0 &= ~(LNmGCR0_RRST_B | LNmGCR0_TRST_B);
> +	lynx_write(serdes, gcr0, LNmGCR0(lane));
> +}
> +
> +static int lynx_power_off(struct phy *phy)
> +{
> +	unsigned int i;
> +	struct lynx_group *group = phy_get_drvdata(phy);
> +
> +	for_each_lane_reverse(i, group)
> +		lynx_power_off_lane(group->serdes, i);
> +
> +	return 0;
> +}
> +
> +/**
> + * lynx_lookup_proto() - Convert a phy-subsystem mode to a protocol
> + * @mode: The mode to convert
> + * @submode: The submode of @mode
> + *
> + * Return: A corresponding serdes-specific mode
> + */
> +static enum lynx_protocol lynx_lookup_proto(enum phy_mode mode, int submode)
> +{
> +	switch (mode) {
> +	case PHY_MODE_ETHERNET:
> +		switch (submode) {
> +		case PHY_INTERFACE_MODE_SGMII:
> +		case PHY_INTERFACE_MODE_1000BASEX:
> +			return LYNX_PROTO_SGMII;
> +		case PHY_INTERFACE_MODE_2500BASEX:
> +			return LYNX_PROTO_SGMII25;
> +		case PHY_INTERFACE_MODE_QSGMII:
> +			return LYNX_PROTO_QSGMII;
> +		case PHY_INTERFACE_MODE_XGMII:
> +		case PHY_INTERFACE_MODE_10GBASER:
> +			return LYNX_PROTO_XFI;
> +		case PHY_INTERFACE_MODE_10GKR:
> +			return LYNX_PROTO_10GKR;
> +		default:
> +			return LYNX_PROTO_NONE;
> +		}
> +	/* Not implemented (yet) */
> +	case PHY_MODE_PCIE:
> +	case PHY_MODE_SATA:
> +	default:
> +		return LYNX_PROTO_NONE;
> +	}
> +}
> +
> +/**
> + * lynx_lookup_mode() - Get the mode for a group/protocol combination
> + * @group: The group of lanes to use
> + * @proto: The protocol to use
> + *
> + * Return: An appropriate mode to use, or %NULL if none match.
> + */
> +static const struct lynx_mode *lynx_lookup_mode(struct lynx_group *group,
> +					    enum lynx_protocol proto)
> +{
> +	int i;
> +	const struct lynx_conf *conf = group->serdes->conf;
> +
> +	for (i = 0; i < conf->mode_count; i++) {
> +		const struct lynx_mode *mode = &conf->modes[i];
> +
> +		if (BIT(proto) & mode->protos &&
> +		    lynx_lane_bitmap(group) == mode->lanes)
> +			return mode;
> +	}
> +
> +	return NULL;
> +}
> +
> +static int lynx_validate(struct phy *phy, enum phy_mode phy_mode, int submode,
> +		       union phy_configure_opts *opts)
> +{
> +	enum lynx_protocol proto;
> +	struct lynx_group *group = phy_get_drvdata(phy);
> +	const struct lynx_mode *mode;
> +
> +	proto = lynx_lookup_proto(phy_mode, submode);
> +	if (proto == LYNX_PROTO_NONE)
> +		return -EINVAL;
> +
> +	/* Nothing to do */
> +	if (proto == group->proto)
> +		return 0;
> +
> +	mode = lynx_lookup_mode(group, proto);
> +	if (!mode)
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +
> +/**
> + * lynx_proto_mode_mask() - Get the mask for a PCCR config
> + * @mode: The mode to use
> + *
> + * Return: The mask, shifted down to the lsb.
> + */
> +static u32 lynx_proto_mode_mask(const struct lynx_mode *mode)
> +{
> +	switch (mode->pccr) {
> +	case 0x0:
> +		if (mode->protos & PROTO_MASK(PCIE))
> +			return PCCR0_PEXa_MASK;
> +		break;
> +	case 0x2:
> +		if (mode->protos & PROTO_MASK(SATA))
> +			return PCCR2_SATAa_MASK;
> +		break;
> +	case 0x8:
> +		if (mode->protos & PROTO_MASK(SGMII))
> +			return PCCR8_SGMIIa_MASK;
> +		break;
> +	case 0x9:
> +		if (mode->protos & PROTO_MASK(QSGMII))
> +			return PCCR9_QSGMIIa_MASK;
> +		break;
> +	case 0xB:
> +		if (mode->protos & PROTO_MASK(XFI))
> +			return PCCRB_XFIa_MASK;
> +		break;
> +	}
> +	pr_err("unknown mode PCCR%X %s%c\n", mode->pccr,
> +	       lynx_proto_str[mode->protos], 'A' + mode->idx);
> +	return 0;
> +}
> +
> +/**
> + * lynx_proto_mode_shift() - Get the shift for a PCCR config
> + * @mode: The mode to use
> + *
> + * Return: The amount of bits to shift the mask.
> + */
> +static u32 lynx_proto_mode_shift(const struct lynx_mode *mode)
> +{
> +	switch (mode->pccr) {
> +	case 0x0:
> +		if (mode->protos & PROTO_MASK(PCIE))
> +			return PCCR0_PEXa_SHIFT(mode->idx);
> +		break;
> +	case 0x2:
> +		if (mode->protos & PROTO_MASK(SATA))
> +			return PCCR2_SATAa_SHIFT(mode->idx);
> +		break;
> +	case 0x8:
> +		if (mode->protos & PROTO_MASK(SGMII))
> +			return PCCR8_SGMIIa_SHIFT(mode->idx);
> +		break;
> +	case 0x9:
> +		if (mode->protos & PROTO_MASK(QSGMII))
> +			return PCCR9_QSGMIIa_SHIFT(mode->idx);
> +		break;
> +	case 0xB:
> +		if (mode->protos & PROTO_MASK(XFI))
> +			return PCCRB_XFIa_SHIFT(mode->idx);
> +		break;
> +	}
> +	pr_err("unknown mode PCCR%X %s%c\n", mode->pccr,
> +	       lynx_proto_str[mode->protos], 'A' + mode->idx);
> +	return 0;
> +}
> +
> +/**
> + * lynx_proto_mode_get() - Get the current config for a PCCR mode
> + * @mode: The mode to use
> + * @pccr: The current value of the PCCR
> + *
> + * Return: The current value of the PCCR config for this mode
> + */
> +static u32 lynx_proto_mode_get(const struct lynx_mode *mode, u32 pccr)
> +{
> +	return (pccr >> lynx_proto_mode_shift(mode)) &
> +	       lynx_proto_mode_mask(mode);
> +}
> +
> +/**
> + * lynx_proto_mode_prep() - Configure a PCCR for a protocol
> + * @mode: The mode to use
> + * @pccr: The current value of the PCCR
> + * @proto: The protocol to configure
> + *
> + * This configures a PCCR for a mode and protocol. To disable a mode, pass
> + * %LYNX_PROTO_NONE as @proto. If @proto is 1000Base-KX, then the KX bit
> + * will be set.
> + *
> + * Return: The new value for the PCCR
> + */
> +static u32 lynx_proto_mode_prep(const struct lynx_mode *mode, u32 pccr,
> +				enum lynx_protocol proto)
> +{
> +	u32 shift = lynx_proto_mode_shift(mode);
> +
> +	pccr &= ~(lynx_proto_mode_mask(mode) << shift);
> +	if (proto != LYNX_PROTO_NONE)
> +		pccr |= mode->cfg << shift;
> +
> +	if (proto == LYNX_PROTO_1000BASEKX) {
> +		if (mode->pccr == 8)
> +			pccr |= PCCR8_SGMIIa_KX << shift;
> +		else
> +			pr_err("PCCR%X doesn't have a KX bit\n", mode->pccr);
> +	}
> +
> +	return pccr;
> +}
> +
> +#define abs_diff(a, b) ({ \
> +	typeof(a) _a = (a); \
> +	typeof(b) _b = (b); \
> +	_a > _b ? _a - _b : _b - _a; \
> +})
> +
> +static int lynx_set_mode(struct phy *phy, enum phy_mode phy_mode, int submode)
> +{
> +	enum lynx_protocol proto;
> +	const struct lynx_proto_params *params;
> +	const struct lynx_mode *old_mode = NULL, *new_mode;
> +	int i, pll, ret;
> +	struct lynx_group *group = phy_get_drvdata(phy);
> +	struct lynx_priv *serdes = group->serdes;
> +	u32 tmp;
> +	u32 gcr0 = 0, gcr1 = 0, recr0 = 0, tecr0 = 0;
> +	u32 gcr0_mask = 0, gcr1_mask = 0, recr0_mask = 0, tecr0_mask = 0;
> +
> +	proto = lynx_lookup_proto(phy_mode, submode);
> +	if (proto == LYNX_PROTO_NONE) {
> +		dev_dbg(&phy->dev, "unknown mode/submode %d/%d\n",
> +			phy_mode, submode);
> +		return -EINVAL;
> +	}
> +
> +	/* Nothing to do */
> +	if (proto == group->proto)
> +		return 0;
> +
> +	new_mode = lynx_lookup_mode(group, proto);
> +	if (!new_mode) {
> +		dev_dbg(&phy->dev, "could not find mode for %s on lanes %u to %u\n",
> +			lynx_proto_str[proto], group->first_lane,
> +			group->last_lane);
> +		return -EINVAL;
> +	}
> +
> +	if (group->proto != LYNX_PROTO_NONE) {
> +		old_mode = lynx_lookup_mode(group, group->proto);
> +		if (!old_mode) {
> +			dev_err(&phy->dev, "could not find mode for %s\n",
> +				lynx_proto_str[group->proto]);
> +			return -EBUSY;
> +		}
> +	}
> +
> +	clk_disable_unprepare(group->pll);
> +	clk_rate_exclusive_put(group->pll);
> +	group->pll = NULL;
> +
> +	/* First, try to use a PLL which already has the correct rate */
> +	params = &lynx_proto_params[proto];
> +	for (pll = 0; pll < ARRAY_SIZE(serdes->pll); pll++) {
> +		struct clk *clk = serdes->pll[pll].hw.clk;
> +		unsigned long rate = clk_get_rate(clk);
> +		unsigned long error = abs_diff(rate, params->frate_khz);
> +
> +		dev_dbg(&phy->dev, "pll%d has rate %lu\n", pll, rate);
> +		/* Accept up to 100ppm deviation */
> +		if ((!error || params->frate_khz / error > 10000) &&
> +		    !clk_set_rate_exclusive(clk, rate))
> +			goto got_pll;
> +		/* Someone else got a different rate first */
> +	}
> +
> +	/* If neither PLL has the right rate, try setting it */
> +	for (pll = 0; pll < 2; pll++) {
> +		ret = clk_set_rate_exclusive(serdes->pll[pll].hw.clk,
> +					     params->frate_khz);
> +		if (!ret)
> +			goto got_pll;
> +	}
> +
> +	dev_dbg(&phy->dev, "could not get a pll at %ukHz\n",
> +		params->frate_khz);
> +	return ret;
> +
> +got_pll:
> +	group->pll = serdes->pll[pll].hw.clk;
> +	clk_prepare_enable(group->pll);
> +
> +	gcr0_mask |= LNmGCR0_RRAT_SEL | LNmGCR0_TRAT_SEL;
> +	gcr0_mask |= LNmGCR0_RPLL_LES | LNmGCR0_TPLL_LES;
> +	gcr0_mask |= LNmGCR0_RRST_B | LNmGCR0_TRST_B;
> +	gcr0_mask |= LNmGCR0_RX_PD | LNmGCR0_TX_PD;
> +	gcr0_mask |= LNmGCR0_IF20BIT_EN | LNmGCR0_PROTS;
> +	gcr0 |= FIELD_PREP(LNmGCR0_RPLL_LES, !pll);
> +	gcr0 |= FIELD_PREP(LNmGCR0_TPLL_LES, !pll);
> +	gcr0 |= FIELD_PREP(LNmGCR0_RRAT_SEL, params->rat_sel);
> +	gcr0 |= FIELD_PREP(LNmGCR0_TRAT_SEL, params->rat_sel);
> +	gcr0 |= FIELD_PREP(LNmGCR0_IF20BIT_EN, params->if20bit);
> +	gcr0 |= FIELD_PREP(LNmGCR0_PROTS, params->prots);
> +
> +	gcr1_mask |= LNmGCR1_RDAT_INV | LNmGCR1_TDAT_INV;
> +	gcr1_mask |= LNmGCR1_OPAD_CTL | LNmGCR1_REIDL_TH;
> +	gcr1_mask |= LNmGCR1_REIDL_EX_SEL | LNmGCR1_REIDL_ET_SEL;
> +	gcr1_mask |= LNmGCR1_REIDL_EX_MSB | LNmGCR1_REIDL_ET_MSB;
> +	gcr1_mask |= LNmGCR1_REQ_CTL_SNP | LNmGCR1_REQ_CDR_SNP;
> +	gcr1_mask |= LNmGCR1_TRSTDIR | LNmGCR1_REQ_BIN_SNP;
> +	gcr1_mask |= LNmGCR1_ISLEW_RCTL | LNmGCR1_OSLEW_RCTL;
> +	gcr1 |= FIELD_PREP(LNmGCR1_REIDL_TH, params->reidl_th);
> +	gcr1 |= FIELD_PREP(LNmGCR1_REIDL_EX_SEL, params->reidl_ex & 3);
> +	gcr1 |= FIELD_PREP(LNmGCR1_REIDL_ET_SEL, params->reidl_et & 3);
> +	gcr1 |= FIELD_PREP(LNmGCR1_REIDL_EX_MSB, params->reidl_ex >> 2);
> +	gcr1 |= FIELD_PREP(LNmGCR1_REIDL_ET_MSB, params->reidl_et >> 2);
> +	gcr1 |= FIELD_PREP(LNmGCR1_TRSTDIR,
> +			   group->first_lane > group->last_lane);
> +	gcr1 |= FIELD_PREP(LNmGCR1_ISLEW_RCTL, params->slew);
> +	gcr1 |= FIELD_PREP(LNmGCR1_OSLEW_RCTL, params->slew);
> +
> +	recr0_mask |= LNmRECR0_GK2OVD | LNmRECR0_GK3OVD;
> +	recr0_mask |= LNmRECR0_GK2OVD_EN | LNmRECR0_GK3OVD_EN;
> +	recr0_mask |= LNmRECR0_BASE_WAND | LNmRECR0_OSETOVD;
> +	if (params->gain) {
> +		recr0 |= FIELD_PREP(LNmRECR0_GK2OVD, params->gain);
> +		recr0 |= FIELD_PREP(LNmRECR0_GK3OVD, params->gain);
> +		recr0 |= LNmRECR0_GK2OVD_EN | LNmRECR0_GK3OVD_EN;
> +	}
> +	recr0 |= FIELD_PREP(LNmRECR0_BASE_WAND, params->baseline_wander);
> +	recr0 |= FIELD_PREP(LNmRECR0_OSETOVD, params->offset_override);
> +
> +	tecr0_mask |= LNmTECR0_TEQ_TYPE;
> +	tecr0_mask |= LNmTECR0_SGN_PREQ | LNmTECR0_RATIO_PREQ;
> +	tecr0_mask |= LNmTECR0_SGN_POST1Q | LNmTECR0_RATIO_PST1Q;
> +	tecr0_mask |= LNmTECR0_ADPT_EQ | LNmTECR0_AMP_RED;
> +	tecr0 |= FIELD_PREP(LNmTECR0_TEQ_TYPE, params->teq);
> +	if (params->preq_ratio) {
> +		tecr0 |= FIELD_PREP(LNmTECR0_SGN_PREQ, 1);
> +		tecr0 |= FIELD_PREP(LNmTECR0_RATIO_PREQ, params->preq_ratio);
> +	}
> +	if (params->postq_ratio) {
> +		tecr0 |= FIELD_PREP(LNmTECR0_SGN_POST1Q, 1);
> +		tecr0 |= FIELD_PREP(LNmTECR0_RATIO_PST1Q, params->postq_ratio);
> +	}
> +	tecr0 |= FIELD_PREP(LNmTECR0_ADPT_EQ, params->adpt_eq);
> +	tecr0 |= FIELD_PREP(LNmTECR0_AMP_RED, params->amp_red);
> +
> +	mutex_lock(&serdes->lock);
> +
> +	/* Disable the old controller */
> +	if (old_mode) {
> +		tmp = lynx_read(serdes, PCCRn(old_mode->pccr));
> +		tmp = lynx_proto_mode_prep(old_mode, tmp, LYNX_PROTO_NONE);
> +		lynx_write(serdes, tmp, PCCRn(old_mode->pccr));
> +
> +		if (old_mode->protos & PROTO_MASK(SGMII)) {
> +			tmp = lynx_read(serdes, SGMIIaCR1(old_mode->idx));
> +			tmp &= SGMIIaCR1_SGPCS_EN;
> +			lynx_write(serdes, tmp, SGMIIaCR1(old_mode->idx));
> +		}
> +	}
> +
> +	for_each_lane_reverse(i, group) {
> +		tmp = lynx_read(serdes, LNmGCR0(i));
> +		tmp &= ~(LNmGCR0_RRST_B | LNmGCR0_TRST_B);
> +		lynx_write(serdes, tmp, LNmGCR0(i));
> +		ndelay(50);
> +
> +		tmp &= ~gcr0_mask;
> +		tmp |= gcr0;
> +		tmp |= FIELD_PREP(LNmGCR0_FIRST_LANE, i == group->first_lane);
> +		lynx_write(serdes, tmp, LNmGCR0(i));
> +
> +		tmp = lynx_read(serdes, LNmGCR1(i));
> +		tmp &= ~gcr1_mask;
> +		tmp |= gcr1;
> +		lynx_write(serdes, tmp, LNmGCR1(i));
> +
> +		tmp = lynx_read(serdes, LNmRECR0(i));
> +		tmp &= ~recr0_mask;
> +		tmp |= recr0;
> +		lynx_write(serdes, tmp, LNmRECR0(i));
> +
> +		tmp = lynx_read(serdes, LNmTECR0(i));
> +		tmp &= ~tecr0_mask;
> +		tmp |= tecr0;
> +		lynx_write(serdes, tmp, LNmTECR0(i));
> +
> +		tmp = lynx_read(serdes, LNmTTLCR0(i));
> +		tmp &= ~LNmTTLCR0_FLT_SEL;
> +		tmp |= FIELD_PREP(LNmTTLCR0_FLT_SEL, params->flt_sel);
> +		lynx_write(serdes, tmp, LNmTTLCR0(i));
> +
> +		ndelay(120);
> +		tmp = lynx_read(serdes, LNmGCR0(i));
> +		tmp |= LNmGCR0_RRST_B | LNmGCR0_TRST_B;
> +		lynx_write(serdes, tmp, LNmGCR0(i));
> +	}
> +
> +	if (proto == LYNX_PROTO_1000BASEKX) {
> +		/* FIXME: this races with clock updates */
> +		tmp = lynx_read(serdes, PLLaCR0(pll));
> +		tmp &= ~PLLaCR0_DLYDIV_SEL;
> +		tmp |= FIELD_PREP(PLLaCR0_DLYDIV_SEL, 1);
> +		lynx_write(serdes, tmp, PLLaCR0(pll));
> +	}
> +
> +	/* Enable the new controller */
> +	tmp = lynx_read(serdes, PCCRn(new_mode->pccr));
> +	tmp = lynx_proto_mode_prep(new_mode, tmp, proto);
> +	lynx_write(serdes, tmp, PCCRn(new_mode->pccr));
> +
> +	if (new_mode->protos & PROTO_MASK(SGMII)) {
> +		tmp = lynx_read(serdes, SGMIIaCR1(new_mode->idx));
> +		tmp |= SGMIIaCR1_SGPCS_EN;
> +		lynx_write(serdes, tmp, SGMIIaCR1(new_mode->idx));
> +	}
> +
> +	mutex_unlock(&serdes->lock);
> +
> +	group->proto = proto;
> +	dev_dbg(&phy->dev, "set mode to %s on lanes %u to %u\n",
> +		lynx_proto_str[proto], group->first_lane, group->last_lane);
> +	return 0;
> +}
> +
> +static void lynx_release(struct phy *phy)
> +{
> +	struct lynx_group *group = phy_get_drvdata(phy);
> +	struct lynx_priv *serdes = group->serdes;
> +
> +	mutex_lock(&serdes->lock);
> +	if (--group->users) {
> +		mutex_unlock(&serdes->lock);
> +		return;
> +	}
> +	list_del(&group->groups);
> +	mutex_unlock(&serdes->lock);
> +
> +	phy_destroy(phy);
> +	kfree(group);
> +}
> +
> +static const struct phy_ops lynx_phy_ops = {
> +	.init = lynx_init,
> +	.exit = lynx_exit,
> +	.power_on = lynx_power_on,
> +	.power_off = lynx_power_off,
> +	.set_mode = lynx_set_mode,
> +	.validate = lynx_validate,
> +	.release = lynx_release,
> +	.owner = THIS_MODULE,
> +};
> +
> +static struct phy *lynx_xlate(struct device *dev, struct of_phandle_args *args)
> +{
> +	struct phy *phy;
> +	struct list_head *head;
> +	struct lynx_group *group;
> +	struct lynx_priv *serdes = dev_get_drvdata(dev);
> +	unsigned int last_lane;
> +
> +	if (args->args_count == 1)
> +		last_lane = args->args[0];
> +	else if (args->args_count == 2)
> +		last_lane = args->args[1];
> +	else
> +		return ERR_PTR(-EINVAL);
> +
> +	mutex_lock(&serdes->lock);
> +
> +	/* Look for an existing group */
> +	list_for_each(head, &serdes->groups) {
> +		group = container_of(head, struct lynx_group, groups);
> +		if (group->first_lane == args->args[0] &&
> +		    group->last_lane == last_lane) {
> +			group->users++;
> +			return group->phy;
> +		}
> +	}
> +
> +	/* None found, create our own */
> +	group = kzalloc(sizeof(*group), GFP_KERNEL);
> +	if (!group) {
> +		mutex_unlock(&serdes->lock);
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	group->serdes = serdes;
> +	group->first_lane = args->args[0];
> +	group->last_lane = last_lane;
> +	group->users = 1;
> +	phy = phy_create(dev, NULL, &lynx_phy_ops);
> +	if (IS_ERR(phy)) {
> +		kfree(group);
> +	} else {
> +		group->phy = phy;
> +		phy_set_drvdata(phy, group);
> +		list_add(&group->groups, &serdes->groups);
> +	}
> +
> +	mutex_unlock(&serdes->lock);
> +	return phy;
> +}
> +
> +static int lynx_probe(struct platform_device *pdev)
> +{
> +	bool grabbed_clocks = false;
> +	int i, ret;
> +	struct device *dev = &pdev->dev;
> +	struct lynx_priv *serdes;
> +	struct regmap_config regmap_config = {};
> +	const struct lynx_conf *conf;
> +	struct resource *res;
> +	void __iomem *base;
> +
> +	serdes = devm_kzalloc(dev, sizeof(*serdes), GFP_KERNEL);
> +	if (!serdes)
> +		return -ENOMEM;
> +	platform_set_drvdata(pdev, serdes);
> +	mutex_init(&serdes->lock);
> +	INIT_LIST_HEAD(&serdes->groups);
> +	serdes->dev = dev;
> +
> +	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
> +	if (IS_ERR(base)) {
> +		ret = PTR_ERR(base);
> +		dev_err_probe(dev, ret, "could not get/map registers\n");
> +		return ret;
> +	}
> +
> +	conf = device_get_match_data(dev);
> +	serdes->conf = conf;
> +	regmap_config.reg_bits = 32;
> +	regmap_config.reg_stride = 4;
> +	regmap_config.val_bits = 32;
> +	regmap_config.val_format_endian = conf->endian;
> +	regmap_config.max_register = res->end - res->start;
> +	regmap_config.disable_locking = true;
> +	serdes->regmap = devm_regmap_init_mmio(dev, base, &regmap_config);
> +	if (IS_ERR(serdes->regmap)) {
> +		ret = PTR_ERR(serdes->regmap);
> +		dev_err_probe(dev, ret, "could not create regmap\n");
> +		return ret;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(serdes->ref); i++) {
> +		static const char fmt[] = "ref%d";
> +		char name[sizeof(fmt)];
> +
> +		snprintf(name, sizeof(name), fmt, i);
> +		serdes->ref[i] = devm_clk_get(dev, name);
> +		if (IS_ERR(serdes->ref[i])) {
> +			ret = PTR_ERR(serdes->ref[i]);
> +			dev_err_probe(dev, ret, "could not get %s\n", name);
> +			return ret;
> +		}
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(serdes->pll); i++) {
> +		static const char fmt[] = "%s.pll%d";
> +		char *name;
> +		const struct clk_hw *ref_hw[] = {
> +			__clk_get_hw(serdes->ref[i]),
> +		};
> +		size_t len;
> +		struct clk_init_data init = {};
> +
> +		len = snprintf(NULL, 0, fmt, pdev->name, i);
> +		name = devm_kzalloc(dev, len + 1, GFP_KERNEL);
> +		if (!name)
> +			return -ENOMEM;
> +
> +		snprintf(name, len + 1, fmt, pdev->name, i);
> +		init.name = name;
> +		init.ops = &lynx_pll_clk_ops;
> +		init.parent_hws = ref_hw;
> +		init.num_parents = 1;
> +		init.flags = CLK_SET_RATE_GATE | CLK_GET_RATE_NOCACHE;
> +		init.flags |= CLK_SET_RATE_PARENT | CLK_OPS_PARENT_ENABLE;
> +
> +		serdes->pll[i].hw.init = &init;
> +		serdes->pll[i].serdes = serdes;
> +		serdes->pll[i].idx = i;
> +		ret = devm_clk_hw_register(dev, &serdes->pll[i].hw);
> +		if (ret) {
> +			dev_err_probe(dev, ret, "could not register %s\n",
> +				      name);
> +			return ret;
> +		}
> +	}
> +
> +	ret = devm_of_clk_add_hw_provider(dev, lynx_clk_get, serdes);
> +	if (ret) {
> +		dev_err_probe(dev, ret, "could not register clock provider\n");
> +		return ret;
> +	}
> +
> +	/* Deselect anything configured by the RCW/bootloader */
> +	for (i = 0; i < conf->mode_count; i++) {
> +		const struct lynx_mode *mode = &conf->modes[i];
> +		u32 pccr = lynx_read(serdes, PCCRn(mode->pccr));
> +
> +		if (lynx_proto_mode_get(mode, pccr) == mode->cfg) {
> +			if (mode->protos & UNSUPPORTED_PROTOS) {
> +				/* Don't mess with modes we don't support */
> +				serdes->used_lanes |= mode->lanes;
> +				if (grabbed_clocks)
> +					continue;
> +
> +				grabbed_clocks = true;
> +				clk_prepare_enable(serdes->pll[0].hw.clk);
> +				clk_prepare_enable(serdes->pll[1].hw.clk);
> +				clk_rate_exclusive_get(serdes->pll[0].hw.clk);
> +				clk_rate_exclusive_get(serdes->pll[1].hw.clk);
> +			} else {
> +				/* Otherwise, clear out the existing config */
> +				pccr = lynx_proto_mode_prep(mode, pccr,
> +							    LYNX_PROTO_NONE);
> +				lynx_write(serdes, pccr, PCCRn(mode->pccr));
> +			}
> +
> +			/* Disable the SGMII PCS until we're ready for it */
> +			if (mode->protos & LYNX_PROTO_SGMII) {
> +				u32 cr1;
> +
> +				cr1 = lynx_read(serdes, SGMIIaCR1(mode->idx));
> +				cr1 &= ~SGMIIaCR1_SGPCS_EN;
> +				lynx_write(serdes, cr1, SGMIIaCR1(mode->idx));
> +			}
> +		}
> +	}
> +
> +	/* Power off all lanes; used ones will be powered on later */
> +	for (i = 0; i < conf->lanes; i++)
> +		lynx_power_off_lane(serdes, i);
> +
> +	ret = PTR_ERR_OR_ZERO(devm_of_phy_provider_register(dev, lynx_xlate));
> +	if (ret)
> +		dev_err_probe(dev, ret, "could not register phy provider\n");
> +	else
> +		dev_info(dev, "probed with %d lanes\n", conf->lanes);
> +	return ret;
> +}
> +
> +/*
> + * XXX: For SerDes1, lane A uses pins SD1_RX3_P/N! That is, the lane numbers
> + * and pin numbers are _reversed_. In addition, the PCCR documentation is
> + * _inconsistent_ in its usage of these terms!
> + *
> + * PCCR "Lane 0" refers to...
> + * ==== =====================
> + *    0 Lane A
> + *    2 Lane A
> + *    8 Lane A
> + *    9 Lane A
> + *    B Lane D!
> + */
> +static const struct lynx_mode ls1046a_modes1[] = {
> +	CONF_SINGLE(1, PCIE, 0x0, 1, 0b001), /* PCIe.1 x1 */
> +	CONF_1000BASEKX(0, 0x8, 0, 0b001), /* SGMII.6 */
> +	CONF_SGMII25KX(1, 0x8, 1, 0b001), /* SGMII.5 */
> +	CONF_SGMII25KX(2, 0x8, 2, 0b001), /* SGMII.10 */
> +	CONF_SGMII25KX(3, 0x8, 3, 0b001), /* SGMII.9 */
> +	CONF_SINGLE(1, QSGMII, 0x9, 2, 0b001), /* QSGMII.6,5,10,1 */
> +	CONF_XFI(2, 0xB, 0, 0b010), /* XFI.10 */
> +	CONF_XFI(3, 0xB, 1, 0b001), /* XFI.9 */
> +};
> +
> +static const struct lynx_conf ls1046a_conf1 = {
> +	.modes = ls1046a_modes1,
> +	.mode_count = ARRAY_SIZE(ls1046a_modes1),
> +	.lanes = 4,
> +	.endian = REGMAP_ENDIAN_BIG,
> +};
> +
> +static const struct lynx_mode ls1046a_modes2[] = {
> +	CONF_SINGLE(0, PCIE, 0x0, 0, 0b001), /* PCIe.1 x1 */
> +	CONF(GENMASK(3, 0), PROTO_MASK(PCIE), 0x0, 0, 0b011), /* PCIe.1 x4 */
> +	CONF_SINGLE(2, PCIE, 0x0, 2, 0b001), /* PCIe.2 x1 */
> +	CONF(GENMASK(3, 2), PROTO_MASK(PCIE), 0x0, 2, 0b010), /* PCIe.3 x2 */
> +	CONF_SINGLE(3, PCIE, 0x0, 2, 0b011), /* PCIe.3 x1 */
> +	CONF_SINGLE(3, SATA, 0x2, 0, 0b001), /* SATA */
> +	CONF_1000BASEKX(1, 0x8, 1, 0b001), /* SGMII.2 */
> +};
> +
> +static const struct lynx_conf ls1046a_conf2 = {
> +	.modes = ls1046a_modes2,
> +	.mode_count = ARRAY_SIZE(ls1046a_modes2),
> +	.lanes = 4,
> +	.endian = REGMAP_ENDIAN_BIG,
> +};
> +
> +static const struct of_device_id lynx_of_match[] = {
> +	{ .compatible = "fsl,ls1046a-serdes-1", .data = &ls1046a_conf1 },
> +	{ .compatible = "fsl,ls1046a-serdes-2", .data = &ls1046a_conf2 },
> +};
> +MODULE_DEVICE_TABLE(of, lynx_of_match);
> +
> +static struct platform_driver lynx_driver = {
> +	.probe = lynx_probe,
> +	.driver = {
> +		.name = "qoriq_serdes",
> +		.of_match_table = lynx_of_match,
> +	},
> +};
> +module_platform_driver(lynx_driver);
> +
> +MODULE_AUTHOR("Sean Anderson <sean.anderson at seco.com>");
> +MODULE_DESCRIPTION("Lynx 10G SerDes driver");
> +MODULE_LICENSE("GPL");
> -- 
> 2.35.1.1320.gc452695387.dirty

-- 
~Vinod