Introduce gpio_find_by_label() in order to allow manipulating GPIOs by
the labels assigned to them via DT or board/driver code.
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
drivers/gpio/gpiolib.c | 17 +++++++++++++++++
include/gpio.h | 6 ++++++
2 files changed, 23 insertions(+)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index b83a27de7..afece61d9 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -91,6 +91,23 @@ done:
return ret;
}
+int gpio_find_by_label(const char *label)
+{
+ int i;
+
+ for (i = 0; i < ARCH_NR_GPIOS; i++) {
+ struct gpio_info *info = &gpio_desc[i];
+
+ if (!info->requested || !info->chip || !info->label)
+ continue;
+
+ if (!strcmp(info->label, label))
+ return i;
+ }
+
+ return -ENOENT;
+}
+
void gpio_free(unsigned gpio)
{
struct gpio_info *gi = gpio_to_desc(gpio);
diff --git a/include/gpio.h b/include/gpio.h
index e42fa2338..38d6ba2df 100644
--- a/include/gpio.h
+++ b/include/gpio.h
@@ -92,6 +92,11 @@ static inline int gpio_request(unsigned gpio, const char *label)
return 0;
}
+static inline int gpio_find_by_label(const char *label)
+{
+ return -ENOSYS;
+}
+
static inline void gpio_free(unsigned gpio)
{
}
@@ -114,6 +119,7 @@ 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_label(const char *label);
void gpio_free(unsigned gpio);
int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
int gpio_request_array(const struct gpio *array, size_t num);
--
2.17.1
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