linux-kernel - Re: [PATCH v2 0/3] leds: blink resolution improvements

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Message-ID: <553EB6CB.6070104@list.ru>
Date:	Tue, 28 Apr 2015 01:23:07 +0300
From:	Stas Sergeev <stsp@...t.ru>
To:	Pavel Machek <pavel@....cz>
CC:	linux-leds@...r.kernel.org,
	Linux kernel <linux-kernel@...r.kernel.org>,
	Stas Sergeev <stsp@...rs.sourceforge.net>
Subject: Re: [PATCH v2 0/3] leds: blink resolution improvements

27.04.2015 23:54, Pavel Machek пишет:
> Hi!
>
>> The following patches improve the precision of led
>> timer trigger and add the delay unit control.
>> That allows to make PWM brightness control with timer
>> trigger.
> Are you sure that is good idea? Doing LED pwm with main cpu is quite harsh...
>
> We already have "brightness" for... well... brightness level.
Btw, your concern can also be addressed in a simple way:
just remove the "brightness" attribute in "timer" mode if the
HW does not support brightness. In some modes you still
need brightness to write either 0 or 255, but in timer mode
it seems absolutely redundant without a HW implementation.
I'd like to create the patch to conditionally disable the
brightness attr in "timer" mode, but I wonder if the change
will have the unexpected compatibility problems...
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