[PATCH 2/4] ARM: at91: gpio: implement gpio_free

configure a gpio as input when freeing it to reduce power consumption

Cc: Nicolas Ferre <redacted>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <redacted>
---
 arch/arm/mach-at91/gpio.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c
index 994ed02..3833f82 100644
--- a/arch/arm/mach-at91/gpio.c
+++ b/arch/arm/mach-at91/gpio.c

@@ -45,6 +45,7 @@ struct at91_gpio_chip {
 #define to_at91_gpio_chip(c) container_of(c, struct at91_gpio_chip, chip)
 
 static int at91_gpiolib_request(struct gpio_chip *chip, unsigned offset);
+static void at91_gpiolib_free(struct gpio_chip *chip, unsigned offset);
 static void at91_gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip);
 static void at91_gpiolib_set(struct gpio_chip *chip, unsigned offset, int val);
 static int at91_gpiolib_get(struct gpio_chip *chip, unsigned offset);

@@ -59,6 +60,7 @@ static int at91_gpiolib_to_irq(struct gpio_chip *chip, unsigned offset);
 		.chip = {						\
 			.label		  = name,			\
 			.request	  = at91_gpiolib_request,	\
+			.free		  = at91_gpiolib_free,		\
 			.direction_input  = at91_gpiolib_direction_input, \
 			.direction_output = at91_gpiolib_direction_output, \
 			.get		  = at91_gpiolib_get,		\

@@ -863,7 +865,10 @@ void __init at91_gpio_irq_setup(void)
 }
 
 /* gpiolib support */
-
+static void at91_gpiolib_free(struct gpio_chip *chip, unsigned offset)
+{
+	at91_gpiolib_direction_input(chip, offset);