linux-kernel - Re: [RESEND,v2 2/2] leds: tlc591xx: Use the OF version of the LED registration function

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Date:   Wed, 11 Sep 2019 10:20:31 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...com>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>, <pavel@....cz>,
        <dmurphy@...com>
CC:     <tomi.valkeinen@...com>, <linux-leds@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND,v2 2/2] leds: tlc591xx: Use the OF version of the LED
 registration function


On 10/09/2019 22:08, Jacek Anaszewski wrote:
> Hi Jean,
>
> Thank you the patch.
>
> On 9/10/19 3:38 PM, Jean-Jacques Hiblot wrote:
>> The driver parses the device-tree to identify which LED should be handled.
>> Since the information about the device node is known at this time, we can
>> provide the LED core with it. It may be useful later.
>>
>> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...com>
>> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...com>
>> Acked-by: Pavel Machek <pavel@....cz>
>> ---
>>   drivers/leds/leds-tlc591xx.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/leds/leds-tlc591xx.c b/drivers/leds/leds-tlc591xx.c
>> index 3d5a4b92f016..10764a62cb71 100644
>> --- a/drivers/leds/leds-tlc591xx.c
>> +++ b/drivers/leds/leds-tlc591xx.c
>> @@ -207,7 +207,7 @@ tlc591xx_probe(struct i2c_client *client,
>>   		led->led_no = reg;
>>   		led->ldev.brightness_set_blocking = tlc591xx_brightness_set;
>>   		led->ldev.max_brightness = LED_FULL;
>> -		err = devm_led_classdev_register(dev, &led->ldev);
>> +		err = devm_of_led_classdev_register(dev, child, &led->ldev);
> devm_of_led_classdev_register() has been replaced with
> devm_led_classdev_register_ext() recently. Do you have some specific
> reason for passing OF node to the LED registration function?

Not anymore at this point.

I used the OF because the other patchset I posted (leds: Add control of 
the voltage/current regulator to the LED core) uses the of_node to find 
a regulator in the node of the LED. Since the regulator stuff is going 
to need some rework, we can drop this patch.

Thanks

JJ

> Currently this is beneficial only for generic LED name composition
> mechanism basing on 'function' and 'color' DT properties so if you
> want you can convert the driver to that. Please compare such recent
> conversions in linux-leds.git for-next branch [0][1].
>
>>   		if (err < 0) {
>>   			dev_err(dev, "couldn't register LED %s\n",
>>   				led->ldev.name);
>>
> [0]
> https://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds.git/commit/?h=for-next&id=a50ff28348934913c46feb7945571329e46c70b3
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds.git/commit/?h=for-next&id=4dcbc8f8c59f4b618d651f5ba884ee5bf562c8de
>