From 4fbb0022cba37eef4a263183fdb7dbee89b299f2 Mon Sep 17 00:00:00 2001
From: Roland Stigge <stigge@antcom.de>
Date: Thu, 28 Jun 2012 00:32:14 +0200
Subject: [PATCH] gpio: of_get_named_gpio_flags() return -EPROBE_DEFER if GPIO
 not yet available

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.

Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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