linux-kernel - Re: [RESEND PATCH v3 2/4] leds: class: store the color index in struct led

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Message-ID: <0f6e0dc0-7101-ff17-09ce-14bd2a0189fb@gmail.com>
Date:   Sun, 18 Sep 2022 13:25:33 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Jean-Jacques Hiblot <jjhiblot@...phandler.com>, pavel@....cz,
        robh+dt@...nel.org, sven.schwermer@...ruptive-technologies.com,
        krzysztof.kozlowski+dt@...aro.org
Cc:     johan+linaro@...nel.org, marijn.suijten@...ainline.org,
        bjorn.andersson@...aro.org, andy.shevchenko@...il.com,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, sha@...gutronix.de
Subject: Re: [RESEND PATCH v3 2/4] leds: class: store the color index in
 struct led_classdev

Hi Jean,

On 9/17/22 10:13, Jean-Jacques Hiblot wrote:
> This information might be useful for more than only deriving the led's
> name.
> 
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> ---
>   drivers/leds/led-class.c | 7 +++++++
>   include/linux/leds.h     | 1 +
>   2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 2c0d979d0c8a..537379f09801 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -350,6 +350,10 @@ int led_classdev_register_ext(struct device *parent,
>   			if (fwnode_property_present(init_data->fwnode,
>   						    "retain-state-shutdown"))
>   				led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN;
> +
> +			if (fwnode_property_present(init_data->fwnode, "color"))
> +				fwnode_property_read_u32(init_data->fwnode, "color",
> +							 &led_cdev->color);
>   		}
>   	} else {
>   		proposed_name = led_cdev->name;
> @@ -359,6 +363,9 @@ int led_classdev_register_ext(struct device *parent,
>   	if (ret < 0)
>   		return ret;
>   
> +	if (led_cdev->color >= LED_COLOR_ID_MAX)
> +		dev_warn(parent, "LED %s color identifier out of range\n", final_name);
> +
>   	mutex_init(&led_cdev->led_access);
>   	mutex_lock(&led_cdev->led_access);
>   	led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index ba4861ec73d3..fe6346604e36 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -71,6 +71,7 @@ struct led_classdev {
>   	const char		*name;
>   	unsigned int brightness;
>   	unsigned int max_brightness;
> +	unsigned int color;

We have color_index in struct mc_subled. What would this serve for?

>   	int			 flags;
>   
>   	/* Lower 16 bits reflect status */

-- 
Best regards,
Jacek Anaszewski