[PATCH 2/3] Phy: Exynos: Add Exynos5250 sata phy driver

[Yuvaraj Kumar]

On Thu, Nov 14, 2013 at 11:18 AM, Kishon Vijay Abraham I <kishon at ti.com> wrote:
> Hi,
>
> On Monday 07 October 2013 07:35 PM, Yuvaraj Cd wrote:
>> On Tue, Oct 1, 2013 at 6:21 PM, Kishon Vijay Abraham I <kishon at ti.com> wrote:
>>> On Tuesday 01 October 2013 12:03 PM, Yuvaraj Kumar C D wrote:
>>>> This patch adds the sata phy driver for Exynos5250.Exynos5250 sata
>>>> phy comprises of CMU and TRSV blocks which are of I2C register Map.
>>>> So this patch also adds a i2c client driver, which is used configure
>>>> the CMU and TRSV block of exynos5250 SATA PHY.
>>>
>>> Why not make the Exynos5250 sata phy as a i2c client driver instead?
>>>>
>>>> This patch incorporates the generic phy framework to deal with sata
>>>> phy.
>>>>
>>>> This patch depends on the below patch
>>>>       [1].drivers: phy: add generic PHY framework
>>>>               by Kishon Vijay Abraham I<kishon at ti.com>
>>>>
>>>> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd at samsung.com>
>>>> Signed-off-by: Girish K S <ks.giri at samsung.com>
>>>> Signed-off-by: Vasanth Ananthan <vasanth.a at samsung.com>
>>>> ---
>>>>  drivers/phy/Kconfig                      |    6 +
>>>>  drivers/phy/Makefile                     |    1 +
>>>>  drivers/phy/exynos/Kconfig               |    5 +
>>>>  drivers/phy/exynos/Makefile              |    5 +
>>>>  drivers/phy/exynos/exynos5250_phy_i2c.c  |   53 +++++++
>>>>  drivers/phy/exynos/sata_phy_exynos5250.c |  248 ++++++++++++++++++++++++++++++
>>>>  drivers/phy/exynos/sata_phy_exynos5250.h |   33 ++++
>>>>  7 files changed, 351 insertions(+)
>>>>  create mode 100644 drivers/phy/exynos/Kconfig
>>>>  create mode 100644 drivers/phy/exynos/Makefile
>>>>  create mode 100644 drivers/phy/exynos/exynos5250_phy_i2c.c
>>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.c
>>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.h
>>>>
>>>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>>>> index 5f85909..ab3d1c6 100644
>>>> --- a/drivers/phy/Kconfig
>>>> +++ b/drivers/phy/Kconfig
>>>> @@ -11,3 +11,9 @@ menuconfig GENERIC_PHY
>>>>         devices present in the kernel. This layer will have the generic
>>>>         API by which phy drivers can create PHY using the phy framework and
>>>>         phy users can obtain reference to the PHY.
>>>> +
>>>> +if GENERIC_PHY
>>>
>>> NAK. Just select GENERIC_PHY from your driver Kconfig.
>>>> +
>>>> +source "drivers/phy/exynos/Kconfig"
>>>> +
>>>> +endif
>>>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>>>> index 9e9560f..e0223d7 100644
>>>> --- a/drivers/phy/Makefile
>>>> +++ b/drivers/phy/Makefile
>>>> @@ -3,3 +3,4 @@
>>>>  #
>>>>
>>>>  obj-$(CONFIG_GENERIC_PHY)    += phy-core.o
>>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += exynos/
>>>
>>> simply have phy-exynos5250 in drivers/phy.
>> ok.
>>>> diff --git a/drivers/phy/exynos/Kconfig b/drivers/phy/exynos/Kconfig
>>>> new file mode 100644
>>>> index 0000000..fa125fb
>>>> --- /dev/null
>>>> +++ b/drivers/phy/exynos/Kconfig
>>>> @@ -0,0 +1,5 @@
>>>> +config PHY_SAMSUNG_SATA
>>>> +     tristate "Samsung Sata SerDes/PHY driver"
>>>> +     help
>>>> +       Support for Samsung sata SerDes/Phy found on Samsung
>>>> +       SoCs.
>>>> diff --git a/drivers/phy/exynos/Makefile b/drivers/phy/exynos/Makefile
>>>> new file mode 100644
>>>> index 0000000..50dc7eb
>>>> --- /dev/null
>>>> +++ b/drivers/phy/exynos/Makefile
>>>> @@ -0,0 +1,5 @@
>>>> +#
>>>> +# Makefile for the exynos phy drivers.
>>>> +#
>>>> +ccflags-y := -Idrivers/phy/exynos
>>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += sata_phy_exynos5250.o exynos5250_phy_i2c.o
>>>> diff --git a/drivers/phy/exynos/exynos5250_phy_i2c.c b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>>> new file mode 100644
>>>> index 0000000..9c75d3b
>>>> --- /dev/null
>>>> +++ b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>>> @@ -0,0 +1,53 @@
>>>> +/*
>>>> + * Copyright (C) 2013 Samsung Electronics Co.Ltd
>>>> + * Author:
>>>> + *   Yuvaraj C D <yuvaraj.cd at samsung.com>
>>>> + *
>>>> + * This program is free software; you can redistribute  it and/or modify it
>>>> + * under  the terms of  the GNU General  Public License as published by the
>>>> + * Free Software Foundation;  either version 2 of the  License, or (at your
>>>> + * option) any later version.
>>>> + *
>>>> + */
>>>> +
>>>> +#include <linux/kernel.h>
>>>> +#include <linux/i2c.h>
>>>> +#include <linux/module.h>
>>>> +#include "sata_phy_exynos5250.h"
>>>> +
>>>> +static int exynos_sata_i2c_probe(struct i2c_client *client,
>>>> +             const struct i2c_device_id *i2c_id)
>>>> +{
>>>> +     sataphy_attach_i2c_client(client);
>>>> +
>>>> +     dev_info(&client->adapter->dev,
>>>> +             "attached %s into i2c adapter successfully\n",
>>>> +             client->name);
>>>> +
>>>> +     return 0;
>>>> +}
>>>> +
>>>> +static int exynos_sata_i2c_remove(struct i2c_client *client)
>>>> +{
>>>> +     dev_info(&client->adapter->dev,
>>>> +             "detached %s from i2c adapter successfully\n",
>>>> +             client->name);
>>>> +
>>>> +     return 0;
>>>> +}
>>>> +
>>>> +static const struct i2c_device_id phy_i2c_device_match[] = {
>>>> +     { "sata-phy-i2c", 0 },
>>>> +};
>>>> +MODULE_DEVICE_TABLE(of, phy_i2c_device_match);
>>>> +
>>>> +struct i2c_driver sataphy_i2c_driver = {
>>>> +     .probe    = exynos_sata_i2c_probe,
>>>> +     .id_table = phy_i2c_device_match,
>>>> +     .remove         = exynos_sata_i2c_remove,
>>>> +     .driver   = {
>>>> +             .name = "sata-phy-i2c",
>>>> +             .owner = THIS_MODULE,
>>>> +             .of_match_table = (void *)phy_i2c_device_match,
>>>> +             },
>>>> +};
>>>
>>> As I just mentioned above, we can merge this driver with the below one.
>> True, Initially it was merged.But already existing drivers of which
>> are of similar to this kind were done in this way.
>> Please refer  /drivers/gpu/drm//exynos/exynos_hdmiphy.c
>
> Can you point to any discussions where it was decided to go with this approach?
Sorry,what I meant is exynos_hdmiphy.c is already exist in the
mainline with this approach.

Initially it was merged on my local patches(Not upstreamed).But after
referring to the
exynos_hdmiphy.c driver and with lot of internal discussions ,it was
decided to go with
the already existing approach.

>
> Thanks
> Kishon