linux-kernel - Re: [PATCH] RX-51: Add missing max_current to rx51_lp5523_led

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Date:	Thu, 19 Sep 2013 23:01:57 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Russell King <linux@....linux.org.uk>, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RX-51: Add missing max_current to rx51_lp5523_led_config

On Thursday 19 September 2013 00:26:43 Tony Lindgren wrote:
> * Pali Rohár <pali.rohar@...il.com> [130918 15:02]:
> > Without max_current data in board file lp5523 driver does
> > not change current.
> 
> Hmm is this a regression or are there other reasons to merge
> this during the -rc cycle?
> 

I think this is regression, drivers/leds/leds-lp55xx-common.c 
code refuse to change led_current sysfs attribute if value is 
higher than max_current specified in board file. And because in 
board file max_current is not specified it is by default zero as 
global variable. So changing led_current is not possible because 
any positive value is more than zero. First I saw this behaviour 
in 3.10, but I forgot to send this patch.

> Regards,
> 
> Tony
> 
> > Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> > ---
> > 
> >  arch/arm/mach-omap2/board-rx51-peripherals.c |    9
> >  +++++++++ 1 file changed, 9 insertions(+)
> > 
> > diff --git a/arch/arm/mach-omap2/board-rx51-peripherals.c
> > b/arch/arm/mach-omap2/board-rx51-peripherals.c index
> > 9326890..d0f857c 100644
> > --- a/arch/arm/mach-omap2/board-rx51-peripherals.c
> > +++ b/arch/arm/mach-omap2/board-rx51-peripherals.c
> > @@ -180,38 +180,47 @@ static struct lp55xx_led_config
> > rx51_lp5523_led_config[] = {
> > 
> >  		.name		= "lp5523:kb1",
> >  		.chan_nr	= 0,
> >  		.led_current	= 50,
> > 
> > +		.max_current	= 255,
> > 
> >  	}, {
> >  	
> >  		.name		= "lp5523:kb2",
> >  		.chan_nr	= 1,
> >  		.led_current	= 50,
> > 
> > +		.max_current	= 255,
> > 
> >  	}, {
> >  	
> >  		.name		= "lp5523:kb3",
> >  		.chan_nr	= 2,
> >  		.led_current	= 50,
> > 
> > +		.max_current	= 255,
> > 
> >  	}, {
> >  	
> >  		.name		= "lp5523:kb4",
> >  		.chan_nr	= 3,
> >  		.led_current	= 50,
> > 
> > +		.max_current	= 255,
> > 
> >  	}, {
> >  	
> >  		.name		= "lp5523:b",
> >  		.chan_nr	= 4,
> >  		.led_current	= 50,
> > 
> > +		.max_current	= 255,
> > 
> >  	}, {
> >  	
> >  		.name		= "lp5523:g",
> >  		.chan_nr	= 5,
> >  		.led_current	= 50,
> > 
> > +		.max_current	= 255,
> > 
> >  	}, {
> >  	
> >  		.name		= "lp5523:r",
> >  		.chan_nr	= 6,
> >  		.led_current	= 50,
> > 
> > +		.max_current	= 255,
> > 
> >  	}, {
> >  	
> >  		.name		= "lp5523:kb5",
> >  		.chan_nr	= 7,
> >  		.led_current	= 50,
> > 
> > +		.max_current	= 255,
> > 
> >  	}, {
> >  	
> >  		.name		= "lp5523:kb6",
> >  		.chan_nr	= 8,
> >  		.led_current	= 50,
> > 
> > +		.max_current	= 255,
> > 
> >  	}
> >  
> >  };

-- 
Pali Rohár
pali.rohar@...il.com

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