[PATCH 07/11] gpiolib: Introduce gpio_find_by_label()

[Andrey Smirnov <andrew.smirnov@gmail.com>]

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@gmail.com>
---
 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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