1 files changed, 51 insertions, 1 deletions

diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index a9432fc6b8ba..20ca7663975f 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -5,6 +5,7 @@
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/of.h>
+#include <linux/pinctrl/pinctrl.h>
 
 #ifdef CONFIG_GPIOLIB
 
@@ -56,6 +57,8 @@ struct device_node;
  *      enabling module power and clock; may sleep
  * @free: optional hook for chip-specific deactivation, such as
  *      disabling module power and clock; may sleep
+ * @get_direction: returns direction for signal "offset", 0=out, 1=in,
+ *      (same as GPIOF_DIR_XXX), or negative error
  * @direction_input: configures signal "offset" as input, or returns error
  * @get: returns value for signal "offset"; for output signals this
  *      returns either the value actually sensed, or zero
@@ -100,7 +103,8 @@ struct gpio_chip {
                                                 unsigned offset);
         void                    (*free)(struct gpio_chip *chip,
                                                 unsigned offset);
-
+        int                     (*get_direction)(struct gpio_chip *chip,
+                                                unsigned offset);
         int                     (*direction_input)(struct gpio_chip *chip,
                                                 unsigned offset);
         int                     (*get)(struct gpio_chip *chip,
@@ -134,6 +138,15 @@ struct gpio_chip {
         int (*of_xlate)(struct gpio_chip *gc,
                         const struct of_phandle_args *gpiospec, u32 *flags);
 #endif
+#ifdef CONFIG_PINCTRL
+        /*
+         * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally
+         * describe the actual pin range which they serve in an SoC. This
+         * information would be used by pinctrl subsystem to configure
+         * corresponding pins for gpio usage.
+         */
+        struct list_head pin_ranges;
+#endif
 };
 
 extern const char *gpiochip_is_requested(struct gpio_chip *chip,
@@ -257,4 +270,41 @@ static inline void gpio_unexport(unsigned gpio)
 }
 #endif  /* CONFIG_GPIO_SYSFS */
 
+#ifdef CONFIG_PINCTRL
+
+/**
+ * struct gpio_pin_range - pin range controlled by a gpio chip
+ * @head: list for maintaining set of pin ranges, used internally
+ * @pctldev: pinctrl device which handles corresponding pins
+ * @range: actual range of pins controlled by a gpio controller
+ */
+
+struct gpio_pin_range {
+        struct list_head node;
+        struct pinctrl_dev *pctldev;
+        struct pinctrl_gpio_range range;
+};
+
+int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
+                           unsigned int gpio_offset, unsigned int pin_offset,
+                           unsigned int npins);
+void gpiochip_remove_pin_ranges(struct gpio_chip *chip);
+
+#else
+
+static inline int
+gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
+                       unsigned int gpio_offset, unsigned int pin_offset,
+                       unsigned int npins)
+{
+        return 0;
+}
+
+static inline void
+gpiochip_remove_pin_ranges(struct gpio_chip *chip)
+{
+}
+
+#endif /* CONFIG_PINCTRL */
+
 #endif /* _ASM_GENERIC_GPIO_H */