Message-ID: <4FDF64C4.8060308@wwwdotorg.org>
Date: Mon, 18 Jun 2012 11:26:28 -0600
From: Stephen Warren <swarren@wwwdotorg.org>
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To: Roland Stigge <stigge@antcom.de>
CC: broonie@opensource.wolfsonmicro.com, cjb@laptop.org,
        grant.likely@secretlab.ca, rob.herring@calxeda.com,
        rmk+kernel@arm.linux.org.uk, ulf.hansson@stericsson.com,
        linus.walleij@linaro.org, linux-mmc@vger.kernel.org,
        linux-kernel@vger.kernel.org, aletes.xgr@gmail.com,
        linux-arm-kernel@lists.infradead.org, lrg@ti.com, perex@perex.cz,
        tiwai@suse.de, alsa-devel@alsa-project.org
Subject: Re: [PATCH] sound/gpio: of_get_named_gpio() return -EPROBE_DEFER
 if GPIO deferred
References: <1340040176-16553-1-git-send-email-stigge@antcom.de>
In-Reply-To: <1340040176-16553-1-git-send-email-stigge@antcom.de>
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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@wwwdotorg.org>

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