linux-kernel - Re: [PATCH] sound/gpio: of_get_named_gpio() return -EPROBE

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Date:	Mon, 18 Jun 2012 14:29:07 -0300
From:	Alexandre Pereira da Silva <aletes.xgr@...il.com>
To:	Roland Stigge <stigge@...com.de>
Cc:	broonie@...nsource.wolfsonmicro.com, swarren@...dotorg.org,
	cjb@...top.org, grant.likely@...retlab.ca, rob.herring@...xeda.com,
	rmk+kernel@....linux.org.uk, ulf.hansson@...ricsson.com,
	linus.walleij@...aro.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	lrg@...com, perex@...ex.cz, tiwai@...e.de,
	alsa-devel@...a-project.org
Subject: Re: [PATCH] sound/gpio: of_get_named_gpio() return -EPROBE_DEFER if
 GPIO deferred

On Mon, Jun 18, 2012 at 2:22 PM, Roland Stigge <stigge@...com.de> wrote:
> of_get_named_gpio_flags() and of_get_named_gpio() return -EPROBE_DEFER if the
> respective GPIO is not (yet) available. This is useful if driver's probe()
> functions try to get a GPIO whose controller isn't probed yet. Thus, the driver
> can be probed again later on.
>
> The function still returns -EINVAL on other errors (parse error or node doesn't
> exist). This way, the case of an optional/intentionally missing GPIO is handled
> appropriately.
>
> For this change, two sound drivers (tegra_{alc5632,wm8903}) need to be
> adjusted.
>
> Signed-off-by: Roland Stigge <stigge@...com.de>
Acked-by: Alexandre Pereira da Silva <aletes.xgr@...il.com>
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