Re: [PATCH V2 1/2] leds: leds-qti-rgb: Add LED driver for QTI TRI_LED module

[Jacek Anaszewski]

Hi,

On 06/05/2017 11:16 PM, Pavel Machek wrote:
> Hi!
> 
>> Generally I came to a conclusion that it will be best to register
>> additional LED RGB class device in an addition to three LED class
>> devices representing each color. In order to avoid hard to solve
>> locking problems I propose to allow for simultaneous access to LED
>> class devices and LED RGB class device gathering them.
>>
>> All in all, currently we also don't give an exclusive access to
>> a particular LED class device, which always can lead to overwriting
>> current brightness by another process. These issues must be arbitrated
>> by user space.
>>
>> I propose that LED RGB class device exposed following files:
>>
>> - red_brightness
>> - green_brightness
>> - blue_brightness
>> - latch_color
> 
> Actually, I'd just do single file, "rgb_brightness" with 3
> values. Overhead of writing 3 values is pretty much 0.

You've always been strongly in favor of one-value-per-file
sysfs rule of thumb, but I'm OK with this approach as well :-)

-- 
Best regards,
Jacek Anaszewski