Re: [PATCH v2 1/6] phy: add a driver for the Berlin SATA PHY

[Kishon Vijay Abraham I <kishon@ti.com>]

Hi,

On Monday 12 May 2014 07:48 PM, Sebastian Hesselbarth wrote:
> On 05/12/2014 02:46 PM, Kishon Vijay Abraham I wrote:
>> Hi,
>>
>> On Monday 12 May 2014 02:46 PM, Antoine Ténart wrote:
>>> The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.
>>>
>>> Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
>>> ---
>>>   drivers/phy/Kconfig           |   5 ++
>>>   drivers/phy/Makefile          |   1 +
>>>   drivers/phy/phy-berlin-sata.c | 179
>>> ++++++++++++++++++++++++++++++++++++++++++
>>>   3 files changed, 185 insertions(+)
>>>   create mode 100644 drivers/phy/phy-berlin-sata.c
>>>
>>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>>> index 4906c27fa3bd..b31b1986fda4 100644
>>> --- a/drivers/phy/Kconfig
>>> +++ b/drivers/phy/Kconfig
>>> @@ -15,6 +15,11 @@ config GENERIC_PHY
>>>         phy users can obtain reference to the PHY. All the users of this
>>>         framework should select this config.
>>>
>>> +config PHY_BERLIN_SATA
>>> +    bool
>>> +    depends on ARCH_BERLIN && OF
>>> +    select GENERIC_PHY
>>> +
>>>   config PHY_EXYNOS_MIPI_VIDEO
>>>       tristate "S5P/EXYNOS SoC series MIPI CSI-2/DSI PHY driver"
>>>       depends on HAS_IOMEM
>>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>>> index 7728518572a4..40278706ac1b 100644
>>> --- a/drivers/phy/Makefile
>>> +++ b/drivers/phy/Makefile
>>> @@ -3,6 +3,7 @@
>>>   #
>>>
>>>   obj-$(CONFIG_GENERIC_PHY)        += phy-core.o
>>> +obj-$(CONFIG_PHY_BERLIN_SATA)        += phy-berlin-sata.o
>>>   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
>>> diff --git a/drivers/phy/phy-berlin-sata.c b/drivers/phy/phy-berlin-sata.c
>>> new file mode 100644
>>> index 000000000000..f20f5ece1a7f
>>> --- /dev/null
>>> +++ b/drivers/phy/phy-berlin-sata.c
>>> @@ -0,0 +1,179 @@
>>> +/*
>>> + * Marvell Berlin SATA PHY driver
>>> + *
>>> + * Copyright (C) 2014 Marvell Technology Group Ltd.
>>> + *
>>> + * Antoine Ténart <antoine.tenart@free-electrons.com>
>>> + *
>>> + * This file is licensed under the terms of the GNU General Public
>>> + * License version 2. This program is licensed "as is" without any
>>> + * warranty of any kind, whether express or implied.
>>> + */
>>> +
>>> +#include <linux/module.h>
>>> +#include <linux/phy/phy.h>
>>> +#include <linux/io.h>
>>> +#include <linux/platform_device.h>
>>> +
>>> +#define HOST_VSA_ADDR        0x0
>>> +#define HOST_VSA_DATA        0x4
>>> +
>>> +#define CONTROL_REGISTER    0x0
>>> +#define MBUS_SIZE_CONTROL    0x4
>>> +
>>> +#define POWER_DOWN_SATA0        BIT(6)
>>> +#define POWER_DOWN_SATA1        BIT(14)
>>> +#define MBUS_WRITE_REQUEST_SIZE_128    (BIT(2) << 16)
>>> +#define MBUS_READ_REQUEST_SIZE_128    (BIT(2) << 19)
>>> +
>>> +#define BERLIN_SATA_PHY_NB    2
>>> +
>>> +#define to_berlin_sata_phy_priv(desc)    \
>>> +    container_of((desc), struct priv, phys[(desc)->index])
>>> +
>>> +struct phy_desc {
>>
>> to be consistent, lets name it phy_berlin_desc.
>>> +    struct phy    *phy;
>>> +    u32        val;
>>> +    unsigned    index;
>>> +};
>>> +
>>> +struct priv {
> 
> And phy_berlin_priv then?
> 
> [...]
>>> +static int phy_berlin_sata_probe(struct platform_device *pdev)
>>> +{
>>> +    struct phy *phy;
>>> +    struct phy_provider *phy_provider;
>>> +    struct priv *priv;
>>> +    struct resource *res;
>>> +    int i;
>>> +
>>> +    priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
>>> +    if (!priv)
>>> +        return -ENOMEM;
>>> +
>>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> +    priv->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
>>> +    if (IS_ERR(priv->base))
>>> +        return PTR_ERR(priv->base);
>>> +
>>> +    phy = devm_phy_create(&pdev->dev, &phy_berlin_sata_ops, NULL);
>>> +    if (IS_ERR(phy))
>>> +        return PTR_ERR(phy);
>>> +
>>> +    dev_set_drvdata(&pdev->dev, priv);
>>> +    spin_lock_init(&priv->lock);
>>> +
>>> +    for (i = 0; i < BERLIN_SATA_PHY_NB; i++) {
>>
>> huh.. this should come from dt data. For devices which have multiple PHYs, each
>> PHY should be modelled as the sub-node of the *PHY provider* device node.
> 
> Just to make sure we get it right:
> 
> You want the PHY (provider) node look like this:
> 
> sata_phy: phy@f7e900a0 {
>     compatible = "marvell,berlin-sata-phy";
>     reg = <0xf7e900a0 0x10>;
>     #address-cells = <1>;
>     #size-cells = <0>;
>     #phy-cells = <1>;
>     status = "okay";
> 
>     sata_phy0: phy@0 { reg = <0>; };
> 
>     sata_phy1: phy@1 { reg = <1>; };
> };
> 
> and parse the number of individual PHYs with
> for_each_child_of_node()?

yeah.. make sure you cc devicetree list when you send the patch.

Cheers
Kishon
> 
> Sebastian
> 
>>> +        struct phy *phy = devm_phy_create(&pdev->dev,
>>> +                          &phy_berlin_sata_ops, NULL);
>>> +        if (IS_ERR(phy)) {
>>> +            dev_err(&pdev->dev, "failed to create PHY %d\n", i);
>>> +            return PTR_ERR(phy);
>>> +        }
>>> +
>>> +        priv->phys[i].phy = phy;
>>> +        priv->phys[i].val = desc[i].val;
>>> +        priv->phys[i].index = i;
>>> +        phy_set_drvdata(phy, &priv->phys[i]);
>>> +
>>> +        /* Make sure the PHY is off */
>>> +        phy_berlin_sata_power_off(phy);
>>> +    }
>>> +
>>> +    phy_provider = devm_of_phy_provider_register(&pdev->dev,
>>> +                             berlin_sata_phy_xlate);
>>> +    if (IS_ERR(phy_provider))
>>> +        return PTR_ERR(phy_provider);
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static const struct of_device_id phy_berlin_sata_of_match[] = {
>>> +    { .compatible = "marvell,berlin-sata-phy" },
>>> +    { },
>>> +};
>>> +
>>> +static struct platform_driver phy_berlin_sata_driver = {
>>> +    .probe    = phy_berlin_sata_probe,
>>> +    .driver    = {
>>> +        .name        = "phy-berlin-sata",
>>> +        .owner        = THIS_MODULE,
>>> +        .of_match_table    = phy_berlin_sata_of_match,
>>> +    },
>>> +};
>>> +module_platform_driver(phy_berlin_sata_driver);
>>> +
>>> +MODULE_DESCRIPTION("Marvell Berlin SATA PHY driver");
>>> +MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
>>> +MODULE_LICENSE("GPL");
>>
>> GPL v2 as the file header states so?
>>
>> Thanks
>> Kishon
>>
>