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

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Date:   Sun, 18 Sep 2022 15:19:21 +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

On 9/18/22 13:25, Jacek Anaszewski wrote:
> 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?

OK, I missed that you're using it leds-group-multicolor.c.

-- 
Best regards,
Jacek Anaszewski