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gpio: Return -EPROBE_DEFER on gpio_get_num() 

GPIO drivers can be registered quite late in registration process
causing dependant devices to fail probing. If we know gpio_get_num
will be called with a non-NULL device, return -EPROBE_DEFER instead
of -ENODEV to allow re-probing later.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sebastian Hesselbarth 2015-04-15 00:53:16 +02:00 committed by Sascha Hauer
parent ab3da15bc1
commit 9744da2e2b
1 changed files with 4 additions and 1 deletions
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5
drivers/gpio/gpiolib.c
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@ -292,12 +292,15 @@ int gpio_get_num(struct device_d *dev, int gpio)
{
struct gpio_chip *chip;
if (!dev)
return -ENODEV;
list_for_each_entry(chip, &chip_list, list) {
if (chip->dev == dev)
return chip->base + gpio;
}
return -ENODEV;
return -EPROBE_DEFER;
}
#ifdef CONFIG_CMD_GPIO