linux-kernel - Re: [PATCH] leds: leds-gpio: Convert gpio_blink

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Message-ID: <CAMuHMdWtcZcpW=r60s9auENZxChiLwr14R0p_soKr7C3yGYOMQ@mail.gmail.com>
Date:	Thu, 6 Nov 2014 11:32:19 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Alexandre Courbot <acourbot@...dia.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: [PATCH] leds: leds-gpio: Convert gpio_blink_set() to use GPIO descriptors

Hi Mika,

On Thu, Nov 6, 2014 at 11:30 AM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
>> "leds: leds-gpio: Add support for GPIO descriptors" broke leds-gpio on
>> non-DT platforms for me:
>>
>>     gpiod_direction_output: invalid GPIO
>>     leds-gpio: probe of leds-gpio failed with error -22
>>
>> (desc is NULL in gpiod_direction_output()).
>>
>> DT shmobile reference/multi-platform are fine.
>>
>> I noticed the hard way, as I wanted to add some LEDs to a new platform,
>> but couldn't get it work. It turned out it also had stopped working on
>> r8a7740/armadillo-legacy, so I started bisecting...
>
> Which board file that is?
>
> There is a bug that gpio_to_desc() returns NULL instead if ERR_PTR() in
> that patch but I wonder why gpio_is_valid() and devm_gpio_request_one()
> do not complain about that prior.

arch/arm/mach-shmobile/board-armadillo800eva.c

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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