gpio: Pass GPIO label down to gpiod_request

Currently all users of fwnode_get_named_gpiod() have no way to
specify a label for the GPIO. So GPIOs listed in debugfs are shown
with label "?". With this change a proper label is used.

Also adjust all users so they can pass a label, properly retrieved
from device tree properties.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpio/devres.c b/drivers/gpio/devres.c
index 5e0b41b5e554..89969e887e5d 100644
--- a/drivers/gpio/devres.c
+++ b/drivers/gpio/devres.c
@@ -138,7 +138,8 @@ EXPORT_SYMBOL(devm_gpiod_get_index);
 struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
                                             const char *con_id,
                                             struct fwnode_handle *child,
-                                            enum gpiod_flags flags)
+                                            enum gpiod_flags flags,
+                                            const char *label)
 {
         static const char * const suffixes[] = { "gpios", "gpio" };
         char prop_name[32]; /* 32 is max size of property name */
@@ -159,7 +160,7 @@ struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
                         snprintf(prop_name, sizeof(prop_name), "%s",
                                                                suffixes[i]);
 
-                desc = fwnode_get_named_gpiod(child, prop_name, flags);
+                desc = fwnode_get_named_gpiod(child, prop_name, flags, label);
                 if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT))
                         break;
         }