gpio: make gpio_{request,free}_array gpio array parameter const

gpio_{request,free}_array should not (and do not) modify the passed gpio
array, so make the parameter const.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/gpio/gpiolib.c

@@ -1296,7 +1296,7 @@ EXPORT_SYMBOL_GPL(gpio_request_one);
  * @array:	array of the 'struct gpio'
  * @num:	how many GPIOs in the array
  */
-int gpio_request_array(struct gpio *array, size_t num)
+int gpio_request_array(const struct gpio *array, size_t num)
 {
 	int i, err;
 
@@ -1319,7 +1319,7 @@ EXPORT_SYMBOL_GPL(gpio_request_array);
  * @array:	array of the 'struct gpio'
  * @num:	how many GPIOs in the array
  */
-void gpio_free_array(struct gpio *array, size_t num)
+void gpio_free_array(const struct gpio *array, size_t num)
 {
 	while (num--)
 		gpio_free((array++)->gpio);

include/asm-generic/gpio.h

@@ -193,8 +193,8 @@ struct gpio {
 };
 
 extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
-extern int gpio_request_array(struct gpio *array, size_t num);
-extern void gpio_free_array(struct gpio *array, size_t num);
+extern int gpio_request_array(const struct gpio *array, size_t num);
+extern void gpio_free_array(const struct gpio *array, size_t num);
 
 #ifdef CONFIG_GPIO_SYSFS
 

include/linux/gpio.h

@@ -41,7 +41,7 @@ static inline int gpio_request_one(unsigned gpio,
 	return -ENOSYS;
 }
 
-static inline int gpio_request_array(struct gpio *array, size_t num)
+static inline int gpio_request_array(const struct gpio *array, size_t num)
 {
 	return -ENOSYS;
 }
@@ -54,7 +54,7 @@ static inline void gpio_free(unsigned gpio)
 	WARN_ON(1);
 }
 
-static inline void gpio_free_array(struct gpio *array, size_t num)
+static inline void gpio_free_array(const struct gpio *array, size_t num)
 {
 	might_sleep();