1 files changed, 27 insertions, 2 deletions

diff --git a/include/linux/pinctrl/pinmux.h b/include/linux/pinctrl/pinmux.h
index 3c430e797efc..937b3e2fa36f 100644
--- a/include/linux/pinctrl/pinmux.h
+++ b/include/linux/pinctrl/pinmux.h
@@ -52,9 +52,15 @@ struct pinctrl_dev;
  * @disable: disable a certain muxing selector with a certain pin group
  * @gpio_request_enable: requests and enables GPIO on a certain pin.
  *      Implement this only if you can mux every pin individually as GPIO. The
- *      affected GPIO range is passed along with an offset into that
+ *      affected GPIO range is passed along with an offset(pin number) into that
  *      specific GPIO range - function selectors and pin groups are orthogonal
- *      to this, the core will however make sure the pins do not collide
+ *      to this, the core will however make sure the pins do not collide.
+ * @gpio_disable_free: free up GPIO muxing on a certain pin, the reverse of
+ *      @gpio_request_enable
+ * @gpio_set_direction: Since controllers may need different configurations
+ *      depending on whether the GPIO is configured as input or output,
+ *      a direction selector function may be implemented as a backing
+ *      to the GPIO controllers that need pin muxing.
  */
 struct pinmux_ops {
         int (*request) (struct pinctrl_dev *pctldev, unsigned offset);
@@ -73,11 +79,20 @@ struct pinmux_ops {
         int (*gpio_request_enable) (struct pinctrl_dev *pctldev,
                                     struct pinctrl_gpio_range *range,
                                     unsigned offset);
+        void (*gpio_disable_free) (struct pinctrl_dev *pctldev,
+                                   struct pinctrl_gpio_range *range,
+                                   unsigned offset);
+        int (*gpio_set_direction) (struct pinctrl_dev *pctldev,
+                                   struct pinctrl_gpio_range *range,
+                                   unsigned offset,
+                                   bool input);
 };
 
 /* External interface to pinmux */
 extern int pinmux_request_gpio(unsigned gpio);
 extern void pinmux_free_gpio(unsigned gpio);
+extern int pinmux_gpio_direction_input(unsigned gpio);
+extern int pinmux_gpio_direction_output(unsigned gpio);
 extern struct pinmux * __must_check pinmux_get(struct device *dev, const char *name);
 extern void pinmux_put(struct pinmux *pmx);
 extern int pinmux_enable(struct pinmux *pmx);
@@ -94,6 +109,16 @@ static inline void pinmux_free_gpio(unsigned gpio)
 {
 }
 
+static inline int pinmux_gpio_direction_input(unsigned gpio)
+{
+        return 0;
+}
+
+static inline int pinmux_gpio_direction_output(unsigned gpio)
+{
+        return 0;
+}
+
 static inline struct pinmux * __must_check pinmux_get(struct device *dev, const char *name)
 {
         return NULL;