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Message-ID: <20141106105855.GL1618@lahna.fi.intel.com>
Date: Thu, 6 Nov 2014 12:58:55 +0200
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
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
On Thu, Nov 06, 2014 at 11:32:19AM +0100, Geert Uytterhoeven wrote:
> 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
Thanks.
Are you able to put some printks() to the 'if (!template->gpiod)' branch
so that it prints out gpio number and what does devm_gpio_request_one()
return?
Something like:
if (!template->gpiod) {
...
ret = devm_gpio_request_one(parent, template->gpio, flags,
template->name);
dev_info(parent, "GPIO %u, ret: %d\n", template->gpio, ret);
if (ret < 0)
...
led_dat->gpiod = gpio_to_desc(template->gpio);
dev_info(parent, "GPIOD: %p\n", led_dat->gpiod);
}
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