pinctrl: support gpio request deferred probing
As pinctrl handles, it may be possible the pinctrl gpio ranges
are still not got registered when user call pinctrl_gpio_request.
Thus, add defer support for it too.
Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index a6386b3..c3b331b 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -291,7 +291,8 @@
*
* Find the pin controller handling a certain GPIO pin from the pinspace of
* the GPIO subsystem, return the device and the matching GPIO range. Returns
- * negative if the GPIO range could not be found in any device.
+ * -EPROBE_DEFER if the GPIO range could not be found in any device since it
+ * may still have not been registered.
*/
static int pinctrl_get_device_gpio_range(unsigned gpio,
struct pinctrl_dev **outdev,
@@ -311,7 +312,7 @@
}
}
- return -EINVAL;
+ return -EPROBE_DEFER;
}
/**
@@ -397,7 +398,7 @@
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
if (ret) {
mutex_unlock(&pinctrl_mutex);
- return -EINVAL;
+ return ret;
}
/* Convert to the pin controllers number space */