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authorRoland Stigge <stigge@antcom.de>2012-06-28 00:32:14 +0200
committerLinus Walleij <linus.walleij@linaro.org>2012-07-17 21:00:21 +0200
commit4fbb0022cba37eef4a263183fdb7dbee89b299f2 (patch)
treeb790642d9981ac77f244b989ae15bb9916b8427e /drivers/gpio
parente93545763021988def06fbda28fe5da133589a96 (diff)
downloadlinux-4fbb0022cba37eef4a263183fdb7dbee89b299f2.tar.bz2
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>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib-of.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index a71aecac451f..a18c4aa68b1e 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -62,7 +62,10 @@ static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
int of_get_named_gpio_flags(struct device_node *np, const char *propname,
int index, enum of_gpio_flags *flags)
{
- struct gg_data gg_data = { .flags = flags, .out_gpio = -ENODEV };
+ /* Return -EPROBE_DEFER to support probe() functions to be called
+ * later when the GPIO actually becomes available
+ */
+ struct gg_data gg_data = { .flags = flags, .out_gpio = -EPROBE_DEFER };
int ret;
/* .of_xlate might decide to not fill in the flags, so clear it. */