linux-kernel - Re: [PATCH 1/3] [media] s5p-tv: Add initial DT-support for sii9234

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Message-ID: <CAJuYYwRSgHLyWSaAyxAWwdSzUHXRmGTirgi_Wvcsfd89kWDx0g@mail.gmail.com>
Date:	Thu, 1 Mar 2012 08:39:08 +0530
From:	Thomas Abraham <thomas.abraham@...aro.org>
To:	Karol Lewandowski <k.lewandowsk@...sung.com>
Cc:	t.stanislaws@...sung.com, m.szyprowski@...sung.com,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-samsung-soc@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH 1/3] [media] s5p-tv: Add initial DT-support for sii9234

Hi Karol,

On 29 February 2012 20:21, Karol Lewandowski <k.lewandowsk@...sung.com> wrote:
> Make it possible to instantiate sii9234, HDMI's MHL, from regular
> device tree description.
>
> Signed-off-by: Karol Lewandowski <k.lewandowsk@...sung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
> ---
>  Documentation/devicetree/bindings/i2c/sii9234.txt |   14 ++++++++++++++
>  drivers/media/video/s5p-tv/sii9234_drv.c          |   20 +++++++++++++++++++-
>  2 files changed, 33 insertions(+), 1 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/i2c/sii9234.txt
>
> diff --git a/Documentation/devicetree/bindings/i2c/sii9234.txt b/Documentation/devicetree/bindings/i2c/sii9234.txt
> new file mode 100644
> index 0000000..7bb7636
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/sii9234.txt
> @@ -0,0 +1,14 @@
> +* SII 9234
> +

A minimal description about this device would be helpful here.

> +Required properties :
> + - compatible : "sii,9234"

To be more informative, can this be changed to "sil,mhl-9234".

> + - reg        : i2c device address
> + - gpio-reset : gpio line used to reset IC
> +
> +Example:
> +
> +       mhl@39 {
> +               compatible = "sii,9234";
> +               reg = <0x39>;
> +               gpio-reset = <&gpf3 4 0 0 0>;
> +       };
> diff --git a/drivers/media/video/s5p-tv/sii9234_drv.c b/drivers/media/video/s5p-tv/sii9234_drv.c
> index 0f31ecc..0a1511a 100644
> --- a/drivers/media/video/s5p-tv/sii9234_drv.c
> +++ b/drivers/media/video/s5p-tv/sii9234_drv.c
> @@ -22,6 +22,8 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/regulator/machine.h>
>  #include <linux/slab.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
>
>  #include <mach/gpio.h>
>  #include <plat/gpio-cfg.h>
> @@ -338,7 +340,15 @@ static int __devinit sii9234_probe(struct i2c_client *client,
>                goto fail_ctx;
>        }
>
> -       ctx->gpio_n_reset = pdata->gpio_n_reset;
> +       if (dev->of_node) {
> +               ctx->gpio_n_reset = of_get_named_gpio(dev->of_node, "gpio-reset", 0);
> +               if (ctx->gpio_n_reset < 0) {

if (gpio_is_valid(ctx->gpio_n_reset)) can be used here.

> +                       ret = -ENODEV;
> +                       goto fail_power;
> +               }
> +       } else
> +               ctx->gpio_n_reset = pdata->gpio_n_reset;

linux coding style suggests to have braces for 'else' branch when
braces are used for the 'if' branch.

> +
>        ret = gpio_request(ctx->gpio_n_reset, "MHL_RST");
>        if (ret) {
>                dev_err(dev, "failed to acquire MHL_RST gpio\n");
> @@ -401,6 +411,13 @@ static int __devexit sii9234_remove(struct i2c_client *client)
>        return 0;
>  }
>
> +#ifdef CONFIG_OF
> +static const struct of_device_id sii9234_dt_match[] = {
> +       { .compatible = "sii,9234" },
> +       { },
> +};
> +MODULE_DEVICE_TABLE(of, sii9234_dt_match);
> +#endif
>
>  static const struct i2c_device_id sii9234_id[] = {
>        { "SII9234", 0 },
> @@ -413,6 +430,7 @@ static struct i2c_driver sii9234_driver = {
>                .name   = "sii9234",
>                .owner  = THIS_MODULE,
>                .pm = &sii9234_pm_ops,
> +               .of_match_table = of_match_ptr(sii9234_dt_match),
>        },
>        .probe          = sii9234_probe,
>        .remove         = __devexit_p(sii9234_remove),
> --
> 1.7.8.3
>

Thanks,
Thomas.
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