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From: Pavel Machek <pavel@ucw.cz>
To: Oleh Kravchenko <oleg@kaa.org.ua>
Cc: Dan Murphy <dmurphy@ti.com>,
	devicetree@vger.kernel.org, linux-leds@vger.kernel.org
Subject: Re: [PATCH v2 2/2] leds: add LED driver for EL15203000 board
Date: Tue, 11 Jun 2019 12:39:22 +0200	[thread overview]
Message-ID: <20190611103922.GB20775@amd> (raw)
In-Reply-To: <cf0e62c5-2502-19d2-5956-f262eee2255d@kaa.org.ua>

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Hi!

> >> +    u8            cmd[2];
> >
> > I am wondering if you should #define this as well.
> It's used only in one place, should I really wrap it to define?
> >
> > Then the #define can be used here and then in the for loop.
> >
> > There is no reason to do ARRAY_SIZE if it will always be 2.
> 
> Result of ARRAY_SIZE() will be always constant and actually it  can be avoided by define.
> 
> But I prefer ARRAY_SIZE() :-)

Me too.

> > As pointed out your max_brightness is a binary and the 0x32 is an effect you technically don't even need max_brightness if you
> >
> > expose the effects as a file.
> >
> > Does 0x32 turn the LED on or off?  Or does it blink the LED?
> 
> It depends on LED board,
> 
> it can blink.
> It can play scene on LED array.
> It can blink smoothly.
> 
> But it depend on the board, not a protocol.

But we expect drivers to control the boards, not protocols.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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      reply	other threads:[~2019-06-11 10:39 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-07 19:03 [PATCH v2 2/2] leds: add LED driver for EL15203000 board Oleh Kravchenko
2019-06-07 20:13 ` Dan Murphy
2019-06-07 21:33   ` Oleh Kravchenko
2019-06-11 10:39     ` Pavel Machek [this message]

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