[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>


drivers/gpio/gpiolib-of.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

linux-2.6.orig/drivers/gpio/gpiolib-of.c
+++ linux-2.6/drivers/gpio/gpiolib-of.c
@@ -62,7 +62,10 @@ static int of_gpiochip_find_and_xlate(st
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. */
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