3 files changed, 24 insertions, 4 deletions
diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h
index 1bcf071b860e..d9245ecec71d 100644
--- a/include/linux/pinctrl/pinconf-generic.h
+++ b/include/linux/pinctrl/pinconf-generic.h
@@ -88,9 +88,13 @@ struct pinctrl_map;
  *	passed in the argument on a custom form, else just use argument 1
  *	to indicate low power mode, argument 0 turns low power mode off.
  * @PIN_CONFIG_MODE_PWM: this will configure the pin for PWM
- * @PIN_CONFIG_OUTPUT: this will configure the pin as an output and drive a
- * 	value on the line. Use argument 1 to indicate high level, argument 0 to
- *	indicate low level. (Please see Documentation/driver-api/pin-control.rst,
+ * @PIN_CONFIG_LEVEL: setting this will configure the pin as an output and
+ *	drive a value on the line. Use argument 1 to indicate high level,
+ *	argument 0 to indicate low level. Conversely the value of the line
+ *	can be read using this parameter, if and only if that value can be
+ *	represented as a binary 0 or 1 where 0 indicate a low voltage level
+ *	and 1 indicate a high voltage level.
+ *	(Please see Documentation/driver-api/pin-control.rst,
  *	section "GPIO mode pitfalls" for a discussion around this parameter.)
  * @PIN_CONFIG_OUTPUT_ENABLE: this will enable the pin's output mode
  * 	without driving a value there. For most platforms this reduces to
@@ -137,7 +141,7 @@ enum pin_config_param {
 	PIN_CONFIG_INPUT_SCHMITT_UV,
 	PIN_CONFIG_MODE_LOW_POWER,
 	PIN_CONFIG_MODE_PWM,
-	PIN_CONFIG_OUTPUT,
+	PIN_CONFIG_LEVEL,
 	PIN_CONFIG_OUTPUT_ENABLE,
 	PIN_CONFIG_OUTPUT_IMPEDANCE_OHMS,
 	PIN_CONFIG_PERSIST_STATE,
diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
index d138e1815645..1a8084e29405 100644
--- a/include/linux/pinctrl/pinctrl.h
+++ b/include/linux/pinctrl/pinctrl.h
@@ -11,6 +11,7 @@
 #ifndef __LINUX_PINCTRL_PINCTRL_H
 #define __LINUX_PINCTRL_PINCTRL_H
 
+#include <linux/bits.h>
 #include <linux/types.h>
 
 struct device;
@@ -206,16 +207,20 @@ extern int pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
 				  const char *pin_group, const unsigned int **pins,
 				  unsigned int *num_pins);
 
+#define PINFUNCTION_FLAG_GPIO	BIT(0)
+
 /**
  * struct pinfunction - Description about a function
  * @name: Name of the function
  * @groups: An array of groups for this function
  * @ngroups: Number of groups in @groups
+ * @flags: Additional pin function flags
  */
 struct pinfunction {
 	const char *name;
 	const char * const *groups;
 	size_t ngroups;
+	unsigned long flags;
 };
 
 /* Convenience macro to define a single named pinfunction */
@@ -226,6 +231,15 @@ struct pinfunction {
 		.ngroups = (_ngroups),			\
 	}
 
+/* Same as PINCTRL_PINFUNCTION() but for the GPIO category of functions */
+#define PINCTRL_GPIO_PINFUNCTION(_name, _groups, _ngroups)	\
+(struct pinfunction) {						\
+		.name = (_name),				\
+		.groups = (_groups),				\
+		.ngroups = (_ngroups),				\
+		.flags = PINFUNCTION_FLAG_GPIO,			\
+	}
+
 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_PINCTRL)
 extern struct pinctrl_dev *of_pinctrl_get(struct device_node *np);
 #else
diff --git a/include/linux/pinctrl/pinmux.h b/include/linux/pinctrl/pinmux.h
index d6f7b58d6ad0..6db6c3e1ccc2 100644
--- a/include/linux/pinctrl/pinmux.h
+++ b/include/linux/pinctrl/pinmux.h
@@ -66,6 +66,8 @@ struct pinmux_ops {
 				    unsigned int selector,
 				    const char * const **groups,
 				    unsigned int *num_groups);
+	bool (*function_is_gpio) (struct pinctrl_dev *pctldev,
+				  unsigned int selector);
 	int (*set_mux) (struct pinctrl_dev *pctldev, unsigned int func_selector,
 			unsigned int group_selector);
 	int (*gpio_request_enable) (struct pinctrl_dev *pctldev,