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

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Message-ID: <4FDF64C4.8060308@wwwdotorg.org>
Date:	Mon, 18 Jun 2012 11:26:28 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Roland Stigge <stigge@...com.de>
CC:	broonie@...nsource.wolfsonmicro.com, 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, aletes.xgr@...il.com,
	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 06/18/2012 11:22 AM, Roland Stigge 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.

Acked-by: Stephen Warren <swarren@...dotorg.org>

(That applies to the two separate sound patches too, if needed!)
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