gpio: Introduce GPIO names

This introduces GPIO names. So far we only have labels which are given
by the requester. In contrast names are given by the provider and do not
change depending on whoever requests a GPIO. The gpio commands now also
accept to reference a GPIO by name.
The printing of the gpioinfo command is adjusted to nicely print both
the label and the name.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/gpio.h b/include/gpio.h
index 4d5f2c25c7..0c0c0337e0 100644
--- a/include/gpio.h
+++ b/include/gpio.h
@@ -114,6 +114,11 @@ static inline int gpio_request(unsigned gpio, const char *label)
 	return 0;
 }
 
+static inline int gpio_find_by_name(const char *name)
+{
+	return -ENOSYS;
+}
+
 static inline int gpio_find_by_label(const char *label)
 {
 	return -ENOSYS;
@@ -141,6 +146,7 @@ static inline void gpio_free_array(const struct gpio *array, size_t num)
 }
 #else
 int gpio_request(unsigned gpio, const char *label);
+int gpio_find_by_name(const char *name);
 int gpio_find_by_label(const char *label);
 void gpio_free(unsigned gpio);
 int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);