pinctrl: add sleep mode management for hogs

This fix allows handling sleep mode for hogged
pins in pinctrl. It provides functions to set pins
to sleep/default configurations according to their
current state.

Signed-off-by: Julien Delacou <julien.delacou@stericsson.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/core.h

@@ -30,6 +30,8 @@ struct pinctrl_gpio_range;
  * @driver_data: driver data for drivers registering to the pin controller
  *	subsystem
  * @p: result of pinctrl_get() for this device
+ * @hog_default: default state for pins hogged by this device
+ * @hog_sleep: sleep state for pins hogged by this device
  * @device_root: debugfs root for this device
  */
 struct pinctrl_dev {
@@ -41,6 +43,8 @@ struct pinctrl_dev {
 	struct module *owner;
 	void *driver_data;
 	struct pinctrl *p;
+	struct pinctrl_state *hog_default;
+	struct pinctrl_state *hog_sleep;
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *device_root;
 #endif
@@ -164,5 +168,8 @@ int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
 			 bool dup, bool locked);
 void pinctrl_unregister_map(struct pinctrl_map const *map);
 
+extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev);
+extern int pinctrl_force_default(struct pinctrl_dev *pctldev);
+
 extern struct mutex pinctrl_mutex;
 extern struct list_head pinctrldev_list;