gpiolib: Include GPIO label in log messages for GPIOs

Provide the human readable label for the GPIO as well as the number when
we are recording it in order to improve the readability of log messages.
Signed-off-by: NMark Brown <broonie@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib.c

@@ -102,6 +102,26 @@ static int gpiod_export_link(struct device *dev, const char *name,
 static int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value);
 static void gpiod_unexport(struct gpio_desc *desc);
 
+#ifdef CONFIG_DEBUG_FS
+#define gpiod_emerg(desc, fmt, ...)			                \
+	pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label, \
+                 ##__VA_ARGS__)
+#define gpiod_crit(desc, fmt, ...)			                \
+	pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label,  \
+                 ##__VA_ARGS__)
+#define gpiod_err(desc, fmt, ...)				        \
+	pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label,   \
+                 ##__VA_ARGS__)
+#define gpiod_warn(desc, fmt, ...)				        \
+	pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label,  \
+                 ##__VA_ARGS__)
+#define gpiod_info(desc, fmt, ...)				        \
+	pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label,  \
+                ##__VA_ARGS__)
+#define gpiod_dbg(desc, fmt, ...)				   \
+	pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label, \
+                 ##__VA_ARGS__)
+#else
 #define gpiod_emerg(desc, fmt, ...)			           \
 	pr_emerg("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
 #define gpiod_crit(desc, fmt, ...)			           \
@@ -114,6 +134,7 @@ static void gpiod_unexport(struct gpio_desc *desc);
 	pr_info("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
 #define gpiod_dbg(desc, fmt, ...)				   \
 	pr_debug("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
+#endif
 
 static inline void desc_set_label(struct gpio_desc *d, const char *label)
 {