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gpiolib: Defer failed gpio requests by default

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Since users must be explicitly provided with a GPIO number in order to
request one the overwhelmingly common case for failing to request will
be that the required GPIO driver has not yet registered and we should
therefore defer until it has registered.

In order to avoid having to code this logic in individual drivers have
gpio_request() return -EPROBE_DEFER when failing to look up the GPIO.
Drivers which don't want this behaviour can override it if they desire.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Mark Brown 2012-07-09 12:22:56 +01:00 committed by Linus Walleij
parent 6d99471016
commit e935457630
1 changed files with 1 additions and 1 deletions
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drivers/gpio/gpiolib.c
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@ -1186,7 +1186,7 @@ int gpio_request(unsigned gpio, const char *label)
{ {
struct gpio_desc *desc; struct gpio_desc *desc;
struct gpio_chip *chip; struct gpio_chip *chip;
int status = -EINVAL; int status = -EPROBE_DEFER;
unsigned long flags; unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags); spin_lock_irqsave(&gpio_lock, flags);