gpiolib: Add !CONFIG_GPIOLIB definitions of devm_ functions

Currently the managed gpio_request() and gpio_free() are not stubbed out
for configurations not using gpiolib - do that to aid use in drivers.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

include/linux/gpio.h

@@ -60,6 +60,12 @@ static inline int gpio_request(unsigned gpio, const char *label)
 	return -ENOSYS;
 }
 
+static inline int devm_gpio_request(struct device *dev, unsigned gpio,
+				    const char *label)
+{
+	return -ENOSYS;
+}
+
 static inline int gpio_request_one(unsigned gpio,
 					unsigned long flags, const char *label)
 {
@@ -79,6 +85,14 @@ static inline void gpio_free(unsigned gpio)
 	WARN_ON(1);
 }
 
+static inline void devm_gpio_free(struct device *dev, unsigned gpio)
+{
+	might_sleep();
+
+	/* GPIO can never have been requested */
+	WARN_ON(1);
+}
+
 static inline void gpio_free_array(const struct gpio *array, size_t num)
 {
 	might_sleep();