diff options
Diffstat (limited to 'drivers/gpio/gpiolib-of.c')
| -rw-r--r-- | drivers/gpio/gpiolib-of.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index d18068a9f3e..f1a45997aea 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -21,7 +21,7 @@ #include <linux/of_gpio.h> #include <linux/slab.h> -/* Private data structure for of_gpiochip_is_match */ +/* Private data structure for of_gpiochip_find_and_xlate */ struct gg_data { enum of_gpio_flags *flags; struct of_phandle_args gpiospec; @@ -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. */ @@ -73,13 +76,13 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname, &gg_data.gpiospec); if (ret) { pr_debug("%s: can't parse gpios property\n", __func__); - return -EINVAL; + return ret; } gpiochip_find(&gg_data, of_gpiochip_find_and_xlate); of_node_put(gg_data.gpiospec.np); - pr_debug("%s exited with status %d\n", __func__, ret); + pr_debug("%s exited with status %d\n", __func__, gg_data.out_gpio); return gg_data.out_gpio; } EXPORT_SYMBOL(of_get_named_gpio_flags); |