linux-kernel - Re: [PATCH-v3 1/3] mfd: 88pm800: Add device tree support

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Date:	Thu, 25 Jun 2015 08:57:57 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Chao Xie <chao.xie@...vell.com>,
	robh+dt@...nel.org, lee.jones@...aro.org
Subject: Re: [PATCH-v3 1/3] mfd: 88pm800: Add device tree support

2015-06-24 18:21 GMT+09:00 Vaibhav Hiremath <vaibhav.hiremath@...aro.org>:
> Add DT support to the 88pm800 driver, along with compatible
> field for it's sub-devices (rtc, onkey and regulator)
>
> Signed-off-by: Chao Xie <chao.xie@...vell.com>
> Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
> ---
>  drivers/mfd/88pm800.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>
> diff --git a/drivers/mfd/88pm800.c b/drivers/mfd/88pm800.c
> index 841717a..059f01a 100644
> --- a/drivers/mfd/88pm800.c
> +++ b/drivers/mfd/88pm800.c
> @@ -27,6 +27,7 @@
>  #include <linux/mfd/core.h>
>  #include <linux/mfd/88pm80x.h>
>  #include <linux/slab.h>
> +#include <linux/of_device.h>
>
>  /* Interrupt Registers */
>  #define PM800_INT_STATUS1              (0x05)
> @@ -121,6 +122,11 @@ static const struct i2c_device_id pm80x_id_table[] = {
>  };
>  MODULE_DEVICE_TABLE(i2c, pm80x_id_table);
>
> +static const struct of_device_id pm80x_of_match_table[] = {
> +       { .compatible = "marvell,88pm800", },
> +       {},
> +};
> +
>  static struct resource rtc_resources[] = {
>         {
>          .name = "88pm80x-rtc",
> @@ -133,6 +139,7 @@ static struct resource rtc_resources[] = {
>  static struct mfd_cell rtc_devs[] = {
>         {
>          .name = "88pm80x-rtc",
> +        .of_compatible = "marvell,88pm80x-rtc",
>          .num_resources = ARRAY_SIZE(rtc_resources),
>          .resources = &rtc_resources[0],
>          .id = -1,
> @@ -151,6 +158,7 @@ static struct resource onkey_resources[] = {
>  static const struct mfd_cell onkey_devs[] = {
>         {
>          .name = "88pm80x-onkey",
> +        .of_compatible = "marvell,88pm80x-onkey",
>          .num_resources = 1,
>          .resources = &onkey_resources[0],
>          .id = -1,
> @@ -160,6 +168,7 @@ static const struct mfd_cell onkey_devs[] = {
>  static const struct mfd_cell regulator_devs[] = {
>         {
>          .name = "88pm80x-regulator",
> +        .of_compatible = "marvell,88pm80x-regulator",
>          .id = -1,
>         },
>  };
> @@ -544,8 +553,23 @@ static int pm800_probe(struct i2c_client *client,
>         int ret = 0;
>         struct pm80x_chip *chip;
>         struct pm80x_platform_data *pdata = dev_get_platdata(&client->dev);
> +       struct device_node *np = client->dev.of_node;
>         struct pm80x_subchip *subchip;
>
> +       if (!pdata && !np) {
> +               dev_err(&client->dev,
> +                       "pm80x requires platform data or of_node\n");
> +               return -EINVAL;
> +       }
> +
> +       if (!pdata) {
> +               pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
> +               if (!pdata) {
> +                       dev_err(&client->dev, "failed to allocaate memory\n");

Generic error message for ENOMEM is not needed. Just return ENOMEM and
the core code will print the error.

Rest looks fine,
Best regards,
Krzysztof
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