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@xxxxxxxxx>
---
Cc: barebox@xxxxxxxxxxxxxxxxxxx
---
drivers/gpio/gpiolib.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 611e41ea5606..1f57c76ec16d 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -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
--
2.1.0
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