linux-kernel - Re: [PATCH v4 3/6] leds: provide devm_of_led_get

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Date:   Fri, 7 Oct 2022 19:24:21 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:     lee.jones@...aro.org, pavel@....cz, robh+dt@...nel.org,
        sven.schwermer@...ruptive-technologies.com,
        krzysztof.kozlowski+dt@...aro.org, johan+linaro@...nel.org,
        marijn.suijten@...ainline.org, bjorn.andersson@...aro.org,
        jacek.anaszewski@...il.com, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/6] leds: provide devm_of_led_get_optional()

On Fri, Oct 7, 2022 at 5:56 PM Jean-Jacques Hiblot
<jjhiblot@...phandler.com> wrote:
>
> This version of devm_of_led_get() doesn't fail if a LED is not found.
> Instead it returns a NULL pointer.

Yep, thanks!

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> ---
>  drivers/leds/led-class.c | 25 +++++++++++++++++++++++++
>  include/linux/leds.h     |  2 ++
>  2 files changed, 27 insertions(+)
>
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 2c0d979d0c8a..2fea79a2300d 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -295,6 +295,31 @@ struct led_classdev *__must_check devm_of_led_get(struct device *dev,
>  }
>  EXPORT_SYMBOL_GPL(devm_of_led_get);
>
> +/**
> + * devm_of_led_get_optional - Resource-managed request of an optional LED device

I'm not sure we need to keep "_of" here in the name, but it's not
harmful anyway.

> + * @dev:       LED consumer
> + * @index:     index of the LED to obtain in the consumer
> + *
> + * The device node of the device is parse to find the request LED device.

I guess you copy'n'pasted this, but this has some spelling issues, I
would change

parse --> parsed
request --> requested

> + * The LED device returned from this function is automatically released
> + * on driver detach.
> + *
> + * @return a pointer to a LED device, ERR_PTR(errno) on failure and NULL if the
> + * led was not found.
> + */
> +struct led_classdev *__must_check devm_of_led_get_optional(struct device *dev,
> +                                                       int index)
> +{
> +       struct led_classdev *led;
> +
> +       led = devm_of_led_get(dev, index);
> +       if (IS_ERR(led) && PTR_ERR(led) == -ENOENT)
> +               return NULL;
> +
> +       return led;
> +}
> +EXPORT_SYMBOL_GPL(devm_of_led_get_optional);
> +
>  static int led_classdev_next_name(const char *init_name, char *name,
>                                   size_t len)
>  {
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index ba4861ec73d3..41df18f42d00 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -215,6 +215,8 @@ extern struct led_classdev *of_led_get(struct device_node *np, int index);
>  extern void led_put(struct led_classdev *led_cdev);
>  struct led_classdev *__must_check devm_of_led_get(struct device *dev,
>                                                   int index);
> +struct led_classdev *__must_check devm_of_led_get_optional(struct device *dev,
> +                                                 int index);
>
>  /**
>   * led_blink_set - set blinking with software fallback
> --
> 2.25.1
>


-- 
With Best Regards,
Andy Shevchenko