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Diffstat (limited to 'include/linux/pinctrl/pinmux.h')
-rw-r--r--include/linux/pinctrl/pinmux.h29
1 files changed, 27 insertions, 2 deletions
diff --git a/include/linux/pinctrl/pinmux.h b/include/linux/pinctrl/pinmux.h
index 3c430e797ef..937b3e2fa36 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;