gpio: tps65910: Add sleep control support

The device tps65910/tps65911 supports the sleep
functionality in some of gpios. If gpio is configured
in output mode and sleep is enabled then during device
sleep state, the output of gpio becomes LOW regardless
of non-sleep output value.
Such gpio can be used to control regulator switch such
that output of regulator is off in device sleep state.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 18 insertions, 2 deletions

diff --git a/drivers/gpio/gpio-tps65910.c b/drivers/gpio/gpio-tps65910.c
index 91f45b965d1e..7eef648a3351 100644
--- a/drivers/gpio/gpio-tps65910.c
+++ b/drivers/gpio/gpio-tps65910.c
@@ -69,6 +69,7 @@ static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
 void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base)
 {
         int ret;
+        struct tps65910_board *board_data;
 
         if (!gpio_base)
                 return;
@@ -80,10 +81,10 @@ void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base)
 
         switch(tps65910_chip_id(tps65910)) {
         case TPS65910:
-                tps65910->gpio.ngpio    = 6;
+                tps65910->gpio.ngpio    = TPS65910_NUM_GPIO;
                 break;
         case TPS65911:
-                tps65910->gpio.ngpio    = 9;
+                tps65910->gpio.ngpio    = TPS65911_NUM_GPIO;
                 break;
         default:
                 return;
@@ -95,6 +96,21 @@ void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base)
         tps65910->gpio.set              = tps65910_gpio_set;
         tps65910->gpio.get              = tps65910_gpio_get;
 
+        /* Configure sleep control for gpios */
+        board_data = dev_get_platdata(tps65910->dev);
+        if (board_data) {
+                int i;
+                for (i = 0; i < tps65910->gpio.ngpio; ++i) {
+                        if (board_data->en_gpio_sleep[i]) {
+                                ret = tps65910_set_bits(tps65910,
+                                        TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
+                                if (ret < 0)
+                                        dev_warn(tps65910->dev,
+                                                "GPIO Sleep setting failed\n");
+                        }
+                }
+        }
+
         ret = gpiochip_add(&tps65910->gpio);
 
         if (ret)