[PATCH v2 3/8] phy: miphy28lp: Provide support for the MiPHY28lp Generic PHY
Gabriel Fernandez
gabriel.fernandez at linaro.org
Tue Sep 9 02:15:49 PDT 2014
Hi Kishon,
Thanks for reviewing.
BR
Gabriel
On 8 September 2014 17:12, Kishon Vijay Abraham I <kishon at ti.com> wrote:
> Hi,
>
> On Wednesday 03 September 2014 09:07 PM, Gabriel FERNANDEZ wrote:
>> The MiPHY28lp is a Generic PHY which can serve various SATA or PCIe
>> or USB3 devices.
>>
>> Signed-off-by: alexandre torgue <alexandre.torgue at st.com>
>> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro at st.com>
>> Signed-off-by: Gabriel Fernandez <gabriel.fernandez at linaro.org>
>> ---
>> drivers/phy/Kconfig | 8 +
>> drivers/phy/Makefile | 1 +
>> drivers/phy/phy-miphy28lp.c | 985 ++++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 994 insertions(+)
>> create mode 100644 drivers/phy/phy-miphy28lp.c
>>
>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> index 0dd7427..2053f72 100644
>> --- a/drivers/phy/Kconfig
>> +++ b/drivers/phy/Kconfig
>> @@ -230,4 +230,12 @@ config PHY_XGENE
>> help
>> This option enables support for APM X-Gene SoC multi-purpose PHY.
>>
>> +config PHY_MIPHY28LP
>> + tristate "STMicroelectronics MIPHY28LP PHY driver for STiH407"
>> + depends on ARCH_STI
>> + depends on GENERIC_PHY
>
> Select GENERIC_PHY so that it's same as other PHY drivers.
Ok
>> + help
>> + Enable this to support the miphy transceiver (for SATA/PCIE/USB3)
>> + that is part of STMicroelectronics STiH407 SoC.
>> +
>> endmenu
>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>> index 95c69ed..f7e7c59 100644
>> --- a/drivers/phy/Makefile
>> +++ b/drivers/phy/Makefile
>> @@ -8,6 +8,7 @@ obj-$(CONFIG_BCM_KONA_USB2_PHY) += phy-bcm-kona-usb2.o
>> obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o
>> obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o
>> obj-$(CONFIG_PHY_MVEBU_SATA) += phy-mvebu-sata.o
>> +obj-$(CONFIG_PHY_MIPHY28LP) += phy-miphy28lp.o
>> obj-$(CONFIG_PHY_MIPHY365X) += phy-miphy365x.o
>> obj-$(CONFIG_OMAP_CONTROL_PHY) += phy-omap-control.o
>> obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o
>> diff --git a/drivers/phy/phy-miphy28lp.c b/drivers/phy/phy-miphy28lp.c
>> new file mode 100644
>> index 0000000..aa36cea
>> --- /dev/null
>> +++ b/drivers/phy/phy-miphy28lp.c
>> @@ -0,0 +1,985 @@
>> +/*
>> + * Copyright (C) 2014 STMicroelectronics
>> + *
>> + * STMicroelectronics PHY driver MiPHY28lp (for SoC STiH407).
>> + *
>> + * Author: Alexandre Torgue <alexandre.torgue at st.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2, as
>> + * published by the Free Software Foundation.
>> + *
>> + */
>> +
>> +#include <linux/platform_device.h>
>> +#include <linux/io.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/of_address.h>
>> +#include <linux/clk.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/delay.h>
>> +#include <linux/mfd/syscon.h>
>> +#include <linux/regmap.h>
>> +#include <linux/reset.h>
>> +
>> +#include <dt-bindings/phy/phy-miphy.h>
>> +
>> +/* MiPHY mask registers */
>> +#define MIPHY_PHY_RDY 0x01
>> +#define MIPHY_PLL_HFC_RDY 0x06
>> +#define MIPHY_COMP_DONE 0x80
>> +
>> +#define MIPHY_PX_RX_POL BIT(5)
>> +
>> +/* MiPHY registers */
>> +#define MIPHY_CONF_RESET 0x00
>> +#define MIPHY_RESET 0x01
>> +#define MIPHY_STATUS_1 0x02
>> +#define MIPHY_CONTROL 0x04
>> +#define MIPHY_BOUNDARY_SEL 0x0a
>> +#define MIPHY_BOUNDARY_1 0x0b
>> +#define MIPHY_BOUNDARY_2 0x0c
>> +#define MIPHY_PLL_CLKREF_FREQ 0x0d
>> +#define MIPHY_SPEED 0x0e
>> +#define MIPHY_CONF 0x0f
>> +#define MIPHY_CTRL_TEST_SEL 0x20
>> +#define MIPHY_CTRL_TEST_1 0x21
>> +#define MIPHY_CTRL_TEST_2 0x22
>> +#define MIPHY_CTRL_TEST_3 0x23
>> +#define MIPHY_CTRL_TEST_4 0x24
>> +#define MIPHY_FEEDBACK_TEST 0x25
>> +#define MIPHY_DEBUG_BUS 0x26
>> +#define MIPHY_DEBUG_STATUS_MSB 0x27
>> +#define MIPHY_DEBUG_STATUS_LSB 0x28
>> +#define MIPHY_PWR_RAIL_1 0x29
>> +#define MIPHY_PWR_RAIL_2 0x2a
>> +#define MIPHY_SYNCHAR_CONTROL 0x30
>> +#define MIPHY_COMP_FSM_1 0x3a
>> +#define MIPHY_COMP_FSM_6 0x3f
>> +#define MIPHY_COMP_POSTP 0x42
>> +#define MIPHY_TX_CTRL_1 0x49
>> +#define MIPHY_TX_CTRL_2 0x4a
>> +#define MIPHY_TX_CTRL_3 0x4b
>> +#define MIPHY_TX_CAL_MAN 0x4e
>> +#define MIPHY_TST_BIAS_BOOST_2 0x62
>> +#define MIPHY_BIAS_BOOST_1 0x63
>> +#define MIPHY_BIAS_BOOST_2 0x64
>> +#define MIPHY_RX_DESBUFF_FDB_2 0x67
>> +#define MIPHY_RX_DESBUFF_FDB_3 0x68
>> +#define MIPHY_SIGDET_COMPENS1 0x69
>> +#define MIPHY_SIGDET_COMPENS2 0x6a
>> +#define MIPHY_JITTER_PERIOD 0x6b
>> +#define MIPHY_JITTER_AMPLITUDE_1 0x6c
>> +#define MIPHY_JITTER_AMPLITUDE_2 0x6d
>> +#define MIPHY_JITTER_AMPLITUDE_3 0x6e
>> +#define MIPHY_RX_K_GAIN 0x78
>> +#define MIPHY_RX_BUFFER_CTRL 0x7a
>> +#define MIPHY_RX_VGA_GAIN 0x7b
>> +#define MIPHY_RX_EQU_GAIN_1 0x7f
>> +#define MIPHY_RX_EQU_GAIN_2 0x80
>> +#define MIPHY_RX_EQU_GAIN_3 0x81
>> +#define MIPHY_RX_CAL_CTRL_1 0x97
>> +#define MIPHY_RX_CAL_CTRL_2 0x98
>> +#define MIPHY_RX_CAL_OFFSET_CTRL 0x99
>> +#define MIPHY_RX_CAL_VGA_STEP 0x9a
>> +#define MIPHY_RX_CAL_EYE_MIN 0x9d
>> +#define MIPHY_RX_CAL_OPT_LENGTH 0x9f
>> +#define MIPHY_RX_LOCK_CTRL_1 0xc1
>> +#define MIPHY_RX_LOCK_SETTINGS_OPT 0xc2
>> +#define MIPHY_RX_LOCK_STEP 0xc4
>> +#define MIPHY_RX_SIGDET_SLEEP_OA 0xc9
>> +#define MIPHY_RX_SIGDET_SLEEP_SEL 0xca
>> +#define MIPHY_RX_SIGDET_WAIT_SEL 0xcb
>> +#define MIPHY_RX_SIGDET_DATA_SEL 0xcc
>> +#define MIPHY_RX_POWER_CTRL_1 0xcd
>> +#define MIPHY_RX_POWER_CTRL_2 0xce
>> +#define MIPHY_PLL_CALSET_CTRL 0xd3
>> +#define MIPHY_PLL_CALSET_1 0xd4
>> +#define MIPHY_PLL_CALSET_2 0xd5
>> +#define MIPHY_PLL_CALSET_3 0xd6
>> +#define MIPHY_PLL_CALSET_4 0xd7
>> +#define MIPHY_PLL_SBR_1 0xe3
>> +#define MIPHY_PLL_SBR_2 0xe4
>> +#define MIPHY_PLL_SBR_3 0xe5
>> +#define MIPHY_PLL_SBR_4 0xe6
>> +#define MIPHY_PLL_COMMON_MISC_2 0xe9
>> +#define MIPHY_PLL_SPAREIN 0xeb
>> +
>> +/*
>> + * On STiH407 the glue logic can be different among MiPHY devices; for example:
>> + * MiPHY0: OSC_FORCE_EXT means:
>> + * 0: 30MHz crystal clk - 1: 100MHz ext clk routed through MiPHY1
>> + * MiPHY1: OSC_FORCE_EXT means:
>> + * 1: 30MHz crystal clk - 0: 100MHz ext clk routed through MiPHY1
>> + * Some devices have not the possibility to check if the osc is ready.
>> + */
>> +#define MIPHY_OSC_FORCE_EXT BIT(3)
>> +#define MIPHY_OSC_RDY BIT(5)
>> +
>> +#define MIPHY_CTRL_MASK 0x0f
>> +#define MIPHY_CTRL_DEFAULT 0
>> +#define MIPHY_CTRL_SYNC_D_EN BIT(2)
>> +
>> +/* SATA / PCIe defines */
>> +#define SATA_CTRL_MASK 0x07
>> +#define PCIE_CTRL_MASK 0xff
>> +#define SATA_CTRL_SELECT_SATA 1
>> +#define SATA_CTRL_SELECT_PCIE 0
>> +#define SYSCFG_PCIE_PCIE_VAL 0x80
>> +#define SATA_SPDMODE 1
>> +
>> +struct miphy28lp_phy {
>> + struct phy *phy;
>> + struct miphy28lp_dev *phydev;
>> + void __iomem *base;
>> + void __iomem *pipebase;
>> +
>> + bool osc_force_ext;
>> + bool osc_rdy;
>> + bool px_rx_pol_inv;
>> +
>> + struct reset_control *miphy_rst;
>> +
>> + u32 sata_gen;
>> +
>> + /* Sysconfig registers offsets needed to configure the device */
>> + u32 syscfg_miphy_ctrl;
>> + u32 syscfg_miphy_status;
>> + u32 syscfg_pci;
>> + u32 syscfg_sata;
>> + u8 type;
>> +};
>> +
>> +struct miphy28lp_dev {
>> + struct device *dev;
>> + struct regmap *regmap;
>> + struct mutex miphy_mutex;
>> + struct miphy28lp_phy **phys;
>> +};
>> +
>> +struct miphy_initval {
>> + u16 reg;
>> + u16 val;
>> +};
>> +
>> +enum miphy_sata_gen { SATA_GEN1, SATA_GEN2, SATA_GEN3 };
>> +
>> +static char *miphy_type_name[] = { "sata-up", "pcie-up", "usb3-up" };
>> +
>> +static inline void miphy28lp_cfg_out_of_reset(struct miphy28lp_phy *miphy_phy)
>> +{
>> + unsigned long finish = jiffies + 5 * HZ;
>> + u8 mask = MIPHY_PLL_HFC_RDY;
>> + u8 val;
>> +
>> + do {
>> + val = readb_relaxed(miphy_phy->base + MIPHY_STATUS_1);
>> + if ((val & mask) != mask)
>> + cpu_relax();
>> + else
>> + break;
>> + } while (!time_after_eq(jiffies, finish));
>> +}
>> +
>> +static inline void miphy28lp_configure_reset(struct miphy28lp_phy *miphy_phy)
>> +{
>> + void *base = miphy_phy->base;
>> +
>> + /* Putting Macro in reset */
>> + writeb_relaxed(0x01, base + MIPHY_CONF_RESET);
>> + writeb_relaxed(0x03, base + MIPHY_CONF_RESET);
>> +
>> + /* Wait for a while */
>> + usleep_range(10, 20); /* extra delay after resetting */
>
> How was this delay value derived? If the HW spec says so, it would be better to
> document it here. Applicable for all the delays added in this patch.
After check with team validation, we remove this delay because it's
only for debug.
>> +}
>> +
>> +
>> +
>> +static inline void miphy28lp_configure_sata(struct miphy28lp_phy *miphy_phy)
>> +{
>> + void __iomem *base = miphy_phy->base;
>> +
>> + /* Putting Macro in reset */
>> + writeb_relaxed(0x01, base + MIPHY_CONF_RESET);
>> + writeb_relaxed(0x03, base + MIPHY_CONF_RESET);
>> +
>> + /* Wait for a while */
>> + usleep_range(10, 20); /* extra delay after resetting */
>
> You already have a function miphy28lp_configure_reset doing the same no?
yes, will be fix on v3
>> +
>> + /* Bringing the MIPHY-CPU registers out of reset */
>> + writeb_relaxed(0x1c, base + MIPHY_CONTROL);
>> +
>> + /* Applying PLL Settings */
>> + writeb_relaxed(0x1d, base + MIPHY_PLL_SPAREIN);
>> + writeb_relaxed(0x1e, base + MIPHY_PLL_CLKREF_FREQ);
>> +
>> + /* PLL Ratio */
>> + writeb_relaxed(0xc8, base + MIPHY_PLL_CALSET_1);
>> + writeb_relaxed(0x00, base + MIPHY_PLL_CALSET_2);
>> + writeb_relaxed(0x00, base + MIPHY_PLL_CALSET_3);
>> + writeb_relaxed(0x00, base + MIPHY_PLL_CALSET_4);
>> +
>> + /* Number of PLL Calibrations */
>> + writeb_relaxed(0x00, base + MIPHY_PLL_CALSET_CTRL);
>> +
>> + /* Unbanked Settings */
>> + writeb_relaxed(0xd1, base + MIPHY_TX_CAL_MAN);
>> + writeb_relaxed(0x1f, base + MIPHY_RX_CAL_OFFSET_CTRL);
>> + writeb_relaxed(0x40, base + MIPHY_BOUNDARY_SEL);
>> +
>> + /* Banked settings */
>> + /* Gen 1 */
>> + writeb_relaxed(0x00, base + MIPHY_CONF);
>> + writeb_relaxed(0x00, base + MIPHY_SPEED);
>> + writeb_relaxed(0x00, base + MIPHY_BIAS_BOOST_1);
>
> Aren't the 0's default reset values? Can we do only the bare minimal settings
> required to get this PHY functions.
0's aren't default reset values, differ on cut version.
>
>> + writeb_relaxed(0xae, base + MIPHY_BIAS_BOOST_2);
>> +
>> + /* TX buffer Settings */
>> + writeb_relaxed(0x53, base + MIPHY_TX_CTRL_2);
>> + writeb_relaxed(0x00, base + MIPHY_TX_CTRL_3);
>> +
>> + /* RX Buffer Settings */
>> + writeb_relaxed(0x0d, base + MIPHY_RX_BUFFER_CTRL);
>> + writeb_relaxed(0x7d, base + MIPHY_RX_EQU_GAIN_1);
>> + writeb_relaxed(0x56, base + MIPHY_RX_EQU_GAIN_2);
>> + writeb_relaxed(0x00, base + MIPHY_RX_EQU_GAIN_3);
>> + writeb_relaxed(0x00, base + MIPHY_RX_VGA_GAIN);
>> +
>> + /* Gen 2 */
>> + writeb_relaxed(0x01, base + MIPHY_CONF);
>> + writeb_relaxed(0x05, base + MIPHY_SPEED);
>> + writeb_relaxed(0x00, base + MIPHY_BIAS_BOOST_1);
>> + writeb_relaxed(0xae, base + MIPHY_BIAS_BOOST_2);
>> +
>> + /* TX buffer Settings */
>> + writeb_relaxed(0x72, base + MIPHY_TX_CTRL_2);
>> + writeb_relaxed(0x20, base + MIPHY_TX_CTRL_3);
>> +
>> + /* RX Buffer Settings */
>> + writeb_relaxed(0x0d, base + MIPHY_RX_BUFFER_CTRL);
>> + writeb_relaxed(0x7d, base + MIPHY_RX_EQU_GAIN_1);
>> + writeb_relaxed(0x56, base + MIPHY_RX_EQU_GAIN_2);
>> + writeb_relaxed(0x00, base + MIPHY_RX_EQU_GAIN_3);
>> + writeb_relaxed(0x00, base + MIPHY_RX_VGA_GAIN);
>> +
>> + /* Gen 3 */
>> + writeb_relaxed(0x02, base + MIPHY_CONF);
>> + writeb_relaxed(0x0a, base + MIPHY_SPEED);
>> + writeb_relaxed(0x00, base + MIPHY_BIAS_BOOST_1);
>> + writeb_relaxed(0xae, base + MIPHY_BIAS_BOOST_2);
>> +
>> + /* TX buffer Settings */
>> + writeb_relaxed(0xc0, base + MIPHY_TX_CTRL_2);
>> + writeb_relaxed(0x20, base + MIPHY_TX_CTRL_3);
>> +
>> + /* RX Buffer Settings */
>> + writeb_relaxed(0x0d, base + MIPHY_RX_BUFFER_CTRL);
>> + writeb_relaxed(0x7d, base + MIPHY_RX_EQU_GAIN_1);
>> + writeb_relaxed(0x56, base + MIPHY_RX_EQU_GAIN_2);
>> + writeb_relaxed(0x00, base + MIPHY_RX_EQU_GAIN_3);
>> + writeb_relaxed(0x00, base + MIPHY_RX_VGA_GAIN);
>> +
>> + /* Power control */
>> + writeb_relaxed(0x21, base + MIPHY_RX_POWER_CTRL_1);
>> +
>> + /* Macro out of reset */
>> + writeb_relaxed(0x00, base + MIPHY_CONF_RESET);
>> +
>> + /* Poll for HFC ready after reset release */
>> + /* Compensation measurement */
>> + writeb_relaxed(0x05, base + MIPHY_RESET);
>> + writeb_relaxed(0x00, base + MIPHY_PLL_COMMON_MISC_2);
>> + writeb_relaxed(0x40, base + MIPHY_COMP_FSM_1);
>> + writeb_relaxed(0x00, base + MIPHY_RESET);
>> + writeb_relaxed(0x40, base + MIPHY_PLL_COMMON_MISC_2);
>
> This function can be split into separate smaller functions and can be resued
> for pcie and usb3.
ok
>> +}
>> +
>> +static inline void miphy28lp_configure_pcie(struct miphy28lp_phy *miphy_phy)
>> +{
>> + void __iomem *base = miphy_phy->base;
>> +
>> + /* Putting Macro in reset */
>> + writeb_relaxed(0x01, base + MIPHY_CONF_RESET);
>> + writeb_relaxed(0x03, base + MIPHY_CONF_RESET);
>> +
>> + /* Wait for a while */
>> + usleep_range(10, 20); /* extra delay after resetting */
>> +
>> + /* Bringing the MIPHY-CPU registers out of reset */
>> + writeb_relaxed(0x01, base + MIPHY_CONF_RESET);
>> + writeb_relaxed(0x14, base + MIPHY_CONTROL);
>> + writeb_relaxed(0x1d, base + MIPHY_PLL_SPAREIN);
>> +
>> + /* Applying PLL Settings */
>> + writeb_relaxed(0x1e, base + MIPHY_PLL_CLKREF_FREQ);
>> +
>> + /* PLL Ratio */
>> + writeb_relaxed(0xa6, base + MIPHY_PLL_CALSET_1);
>> + writeb_relaxed(0xaa, base + MIPHY_PLL_CALSET_2);
>> + writeb_relaxed(0xaa, base + MIPHY_PLL_CALSET_3);
>> + writeb_relaxed(0x00, base + MIPHY_PLL_CALSET_4);
>> + writeb_relaxed(0x00, base + MIPHY_PLL_CALSET_CTRL);
>> +
>> + writeb_relaxed(0xd1, base + MIPHY_TX_CAL_MAN);
>> + writeb_relaxed(0x5f, base + MIPHY_RX_CAL_OFFSET_CTRL);
>> + writeb_relaxed(0x40, base + MIPHY_BOUNDARY_SEL);
>> +
>> + /* Banked settings */
>> + /* Gen 1 */
>> + writeb_relaxed(0x00, base + MIPHY_CONF);
>> +
>> + writeb_relaxed(0x05, base + MIPHY_SPEED);
>> + writeb_relaxed(0x00, base + MIPHY_BIAS_BOOST_1);
>> + writeb_relaxed(0xa5, base + MIPHY_BIAS_BOOST_2);
>> +
>> + /* TX buffer Settings */
>> + writeb_relaxed(0x07, base + MIPHY_TX_CTRL_1);
>> + writeb_relaxed(0x71, base + MIPHY_TX_CTRL_2);
>> + writeb_relaxed(0x60, base + MIPHY_TX_CTRL_3);
>> + writeb_relaxed(0x98, base + MIPHY_RX_K_GAIN);
>> +
>> + /* RX Buffer Settings */
>> + writeb_relaxed(0x0d, base + MIPHY_RX_BUFFER_CTRL);
>> + writeb_relaxed(0x00, base + MIPHY_RX_VGA_GAIN);
>> + writeb_relaxed(0x79, base + MIPHY_RX_EQU_GAIN_1);
>> + writeb_relaxed(0x56, base + MIPHY_RX_EQU_GAIN_2);
>> +
>> + /* Gen 2 */
>> + writeb_relaxed(0x01, base + MIPHY_CONF);
>> + writeb_relaxed(0x0a, base + MIPHY_SPEED);
>> + writeb_relaxed(0x00, base + MIPHY_BIAS_BOOST_1);
>> + writeb_relaxed(0xa5, base + MIPHY_BIAS_BOOST_2);
>> +
>> + /* TX buffer Settings */
>> + writeb_relaxed(0x07, base + MIPHY_TX_CTRL_1);
>> + writeb_relaxed(0x70, base + MIPHY_TX_CTRL_2);
>> + writeb_relaxed(0x60, base + MIPHY_TX_CTRL_3);
>> + writeb_relaxed(0xcc, base + MIPHY_RX_K_GAIN);
>> +
>> + /* RX Buffer Settings */
>> + writeb_relaxed(0x0d, base + MIPHY_RX_BUFFER_CTRL);
>> + writeb_relaxed(0x00, base + MIPHY_RX_VGA_GAIN);
>> + writeb_relaxed(0x78, base + MIPHY_RX_EQU_GAIN_1);
>> + writeb_relaxed(0x07, base + MIPHY_RX_EQU_GAIN_2);
>> +
>> + writeb_relaxed(0x21, base + MIPHY_RX_POWER_CTRL_1);
>> +
>> + /* Macro out of reset */
>> + writeb_relaxed(0x00, base + MIPHY_CONF_RESET);
>> +
>> + /* Poll for HFC ready after reset release */
>> + /* Compensation measurement */
>> + writeb_relaxed(0x05, base + MIPHY_RESET);
>> + writeb_relaxed(0x00, base + MIPHY_PLL_COMMON_MISC_2);
>> + writeb_relaxed(0x1e, base + MIPHY_PLL_CLKREF_FREQ);
>> + writeb_relaxed(0x40, base + MIPHY_COMP_FSM_1);
>> +
>> + /* extra delay to wait pll lock */
>> + usleep_range(100, 120);
>> +
>> + writeb_relaxed(0x01, base + MIPHY_RESET);
>> + writeb_relaxed(0x00, base + MIPHY_RESET);
>> + writeb_relaxed(0x40, base + MIPHY_PLL_COMMON_MISC_2);
>> + writeb_relaxed(0x02, base + MIPHY_PLL_SBR_1);
>
> Are all these settings necessary? Can't we have a bare minimal settings needed
> to get the PHY functional.
Yes all settings are necessary.
>
> Thanks
> Kishon
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