3 files changed, 116 insertions, 60 deletions
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index db2dfbae8edb..45b651c05b9c 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -3,6 +3,7 @@
 #define __LINUX_GPIO_CONSUMER_H
 
 #include <linux/bits.h>
+#include <linux/err.h>
 #include <linux/types.h>
 
 struct acpi_device;
@@ -110,8 +111,6 @@ int gpiod_get_direction(struct gpio_desc *desc);
 int gpiod_direction_input(struct gpio_desc *desc);
 int gpiod_direction_output(struct gpio_desc *desc, int value);
 int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
-int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags);
-int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags);
 
 /* Value get/set from non-sleeping context */
 int gpiod_get_value(const struct gpio_desc *desc);
@@ -119,7 +118,7 @@ int gpiod_get_array_value(unsigned int array_size,
 			  struct gpio_desc **desc_array,
 			  struct gpio_array *array_info,
 			  unsigned long *value_bitmap);
-void gpiod_set_value(struct gpio_desc *desc, int value);
+int gpiod_set_value(struct gpio_desc *desc, int value);
 int gpiod_set_array_value(unsigned int array_size,
 			  struct gpio_desc **desc_array,
 			  struct gpio_array *array_info,
@@ -129,7 +128,7 @@ int gpiod_get_raw_array_value(unsigned int array_size,
 			      struct gpio_desc **desc_array,
 			      struct gpio_array *array_info,
 			      unsigned long *value_bitmap);
-void gpiod_set_raw_value(struct gpio_desc *desc, int value);
+int gpiod_set_raw_value(struct gpio_desc *desc, int value);
 int gpiod_set_raw_array_value(unsigned int array_size,
 			      struct gpio_desc **desc_array,
 			      struct gpio_array *array_info,
@@ -141,7 +140,7 @@ int gpiod_get_array_value_cansleep(unsigned int array_size,
 				   struct gpio_desc **desc_array,
 				   struct gpio_array *array_info,
 				   unsigned long *value_bitmap);
-void gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
+int gpiod_set_value_cansleep(struct gpio_desc *desc, int value);
 int gpiod_set_array_value_cansleep(unsigned int array_size,
 				   struct gpio_desc **desc_array,
 				   struct gpio_array *array_info,
@@ -151,7 +150,7 @@ int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
 				       struct gpio_desc **desc_array,
 				       struct gpio_array *array_info,
 				       unsigned long *value_bitmap);
-void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
+int gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value);
 int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
 				       struct gpio_desc **desc_array,
 				       struct gpio_array *array_info,
@@ -183,11 +182,9 @@ struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev,
 
 #else /* CONFIG_GPIOLIB */
 
-#include <linux/err.h>
+#include <linux/bug.h>
 #include <linux/kernel.h>
 
-#include <asm/bug.h>
-
 static inline int gpiod_count(struct device *dev, const char *con_id)
 {
 	return 0;
@@ -348,18 +345,6 @@ static inline int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
 	WARN_ON(desc);
 	return -ENOSYS;
 }
-static inline int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc,
-					       unsigned long flags)
-{
-	WARN_ON(desc);
-	return -ENOSYS;
-}
-static inline int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc,
-						unsigned long flags)
-{
-	WARN_ON(desc);
-	return -ENOSYS;
-}
 static inline int gpiod_get_value(const struct gpio_desc *desc)
 {
 	/* GPIO can never have been requested */
@@ -375,10 +360,11 @@ static inline int gpiod_get_array_value(unsigned int array_size,
 	WARN_ON(desc_array);
 	return 0;
 }
-static inline void gpiod_set_value(struct gpio_desc *desc, int value)
+static inline int gpiod_set_value(struct gpio_desc *desc, int value)
 {
 	/* GPIO can never have been requested */
 	WARN_ON(desc);
+	return 0;
 }
 static inline int gpiod_set_array_value(unsigned int array_size,
 					struct gpio_desc **desc_array,
@@ -404,10 +390,11 @@ static inline int gpiod_get_raw_array_value(unsigned int array_size,
 	WARN_ON(desc_array);
 	return 0;
 }
-static inline void gpiod_set_raw_value(struct gpio_desc *desc, int value)
+static inline int gpiod_set_raw_value(struct gpio_desc *desc, int value)
 {
 	/* GPIO can never have been requested */
 	WARN_ON(desc);
+	return 0;
 }
 static inline int gpiod_set_raw_array_value(unsigned int array_size,
 					    struct gpio_desc **desc_array,
@@ -434,10 +421,11 @@ static inline int gpiod_get_array_value_cansleep(unsigned int array_size,
 	WARN_ON(desc_array);
 	return 0;
 }
-static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
+static inline int gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
 {
 	/* GPIO can never have been requested */
 	WARN_ON(desc);
+	return 0;
 }
 static inline int gpiod_set_array_value_cansleep(unsigned int array_size,
 					    struct gpio_desc **desc_array,
@@ -463,11 +451,12 @@ static inline int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
 	WARN_ON(desc_array);
 	return 0;
 }
-static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
-						int value)
+static inline int gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
+					       int value)
 {
 	/* GPIO can never have been requested */
 	WARN_ON(desc);
+	return 0;
 }
 static inline int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
 						struct gpio_desc **desc_array,
@@ -560,6 +549,31 @@ struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev,
 
 #endif /* CONFIG_GPIOLIB */
 
+#if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_HTE)
+int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags);
+int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags);
+#else
+
+#include <linux/bug.h>
+
+static inline int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc,
+					       unsigned long flags)
+{
+	if (!IS_ENABLED(CONFIG_GPIOLIB))
+		WARN_ON(desc);
+
+	return -ENOSYS;
+}
+static inline int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc,
+						unsigned long flags)
+{
+	if (!IS_ENABLED(CONFIG_GPIOLIB))
+		WARN_ON(desc);
+
+	return -ENOSYS;
+}
+#endif /* CONFIG_GPIOLIB && CONFIG_HTE */
+
 static inline
 struct gpio_desc *devm_fwnode_gpiod_get(struct device *dev,
 					struct fwnode_handle *fwnode,
@@ -608,8 +622,6 @@ int devm_acpi_dev_add_driver_gpios(struct device *dev,
 
 #else  /* CONFIG_GPIOLIB && CONFIG_ACPI */
 
-#include <linux/err.h>
-
 static inline int acpi_dev_add_driver_gpios(struct acpi_device *adev,
 			      const struct acpi_gpio_mapping *gpios)
 {
@@ -635,8 +647,6 @@ void gpiod_unexport(struct gpio_desc *desc);
 
 #else  /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
 
-#include <asm/errno.h>
-
 static inline int gpiod_export(struct gpio_desc *desc,
 			       bool direction_may_change)
 {
@@ -655,4 +665,14 @@ static inline void gpiod_unexport(struct gpio_desc *desc)
 
 #endif /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
 
+static inline int gpiod_multi_set_value_cansleep(struct gpio_descs *descs,
+						 unsigned long *value_bitmap)
+{
+	if (IS_ERR_OR_NULL(descs))
+		return PTR_ERR_OR_ZERO(descs);
+
+	return gpiod_set_array_value_cansleep(descs->ndescs, descs->desc,
+					      descs->info, value_bitmap);
+}
+
 #endif
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 2dd7cb9cc270..4c0294a9104d 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -14,6 +14,7 @@
 #include <linux/property.h>
 #include <linux/spinlock_types.h>
 #include <linux/types.h>
+#include <linux/util_macros.h>
 
 #ifdef CONFIG_GENERIC_MSI_IRQ
 #include <asm/msi.h>
@@ -328,7 +329,8 @@ struct gpio_irq_chip {
  * @fwnode: optional fwnode providing this controller's properties
  * @owner: helps prevent removal of modules exporting active GPIOs
  * @request: optional hook for chip-specific activation, such as
- *	enabling module power and clock; may sleep
+ *	enabling module power and clock; may sleep; must return 0 on success
+ *	or negative error number on failure
  * @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,
@@ -344,10 +346,15 @@ struct gpio_irq_chip {
  * @get: returns value for signal "offset", 0=low, 1=high, or negative error
  * @get_multiple: reads values for multiple signals defined by "mask" and
  *	stores them in "bits", returns 0 on success or negative error
- * @set: assigns output value for signal "offset"
- * @set_multiple: assigns output values for multiple signals defined by "mask"
+ * @set: **DEPRECATED** - please use set_rv() instead
+ * @set_multiple: **DEPRECATED** - please use set_multiple_rv() instead
+ * @set_rv: assigns output value for signal "offset", returns 0 on success or
+ *          negative error value
+ * @set_multiple_rv: assigns output values for multiple signals defined by
+ *                   "mask", returns 0 on success or negative error value
  * @set_config: optional hook for all kinds of settings. Uses the same
- *	packed config format as generic pinconf.
+ *	packed config format as generic pinconf. Must return 0 on success and
+ *	a negative error number on failure.
  * @to_irq: optional hook supporting non-static gpiod_to_irq() mappings;
  *	implementation may not sleep
  * @dbg_show: optional routine to show contents in debugfs; default code
@@ -394,6 +401,7 @@ struct gpio_irq_chip {
  * @reg_dir_in: direction in setting register for generic GPIO
  * @bgpio_dir_unreadable: indicates that the direction register(s) cannot
  *	be read and we need to rely on out internal state tracking.
+ * @bgpio_pinctrl: the generic GPIO uses a pin control backend.
  * @bgpio_bits: number of register bits used for a generic GPIO i.e.
  *	<register width> * 8
  * @bgpio_lock: used to lock chip->bgpio_data. Also, this is needed to keep
@@ -441,6 +449,12 @@ struct gpio_chip {
 	void			(*set_multiple)(struct gpio_chip *gc,
 						unsigned long *mask,
 						unsigned long *bits);
+	int			(*set_rv)(struct gpio_chip *gc,
+					  unsigned int offset,
+					  int value);
+	int			(*set_multiple_rv)(struct gpio_chip *gc,
+						   unsigned long *mask,
+						   unsigned long *bits);
 	int			(*set_config)(struct gpio_chip *gc,
 					      unsigned int offset,
 					      unsigned long config);
@@ -478,6 +492,7 @@ struct gpio_chip {
 	void __iomem *reg_dir_out;
 	void __iomem *reg_dir_in;
 	bool bgpio_dir_unreadable;
+	bool bgpio_pinctrl;
 	int bgpio_bits;
 	raw_spinlock_t bgpio_lock;
 	unsigned long bgpio_data;
@@ -499,14 +514,6 @@ struct gpio_chip {
 	struct gpio_irq_chip irq;
 #endif /* CONFIG_GPIOLIB_IRQCHIP */
 
-	/**
-	 * @valid_mask:
-	 *
-	 * If not %NULL, holds bitmask of GPIOs which are valid to be used
-	 * from the chip.
-	 */
-	unsigned long *valid_mask;
-
 #if defined(CONFIG_OF_GPIO)
 	/*
 	 * If CONFIG_OF_GPIO is enabled, then all GPIO controllers described in
@@ -516,11 +523,33 @@ struct gpio_chip {
 	/**
 	 * @of_gpio_n_cells:
 	 *
-	 * Number of cells used to form the GPIO specifier.
+	 * Number of cells used to form the GPIO specifier. The standard is 2
+	 * cells:
+	 *
+	 * gpios = <&gpio offset flags>;
+	 *
+	 * some complex GPIO controllers instantiate more than one chip per
+	 * device tree node and have 3 cells:
+	 *
+	 * gpios = <&gpio instance offset flags>;
+	 *
+	 * Legacy GPIO controllers may even have 1 cell:
+	 *
+	 * gpios = <&gpio offset>;
 	 */
 	unsigned int of_gpio_n_cells;
 
 	/**
+	 * @of_node_instance_match:
+	 *
+	 * Determine if a chip is the right instance. Must be implemented by
+	 * any driver using more than one gpio_chip per device tree node.
+	 * Returns true if gc is the instance indicated by i (which is the
+	 * first cell in the phandles for GPIO lines and gpio-ranges).
+	 */
+	bool (*of_node_instance_match)(struct gpio_chip *gc, unsigned int i);
+
+	/**
 	 * @of_xlate:
 	 *
 	 * Callback to translate a device tree GPIO specifier into a chip-
@@ -550,19 +579,29 @@ DEFINE_CLASS(_gpiochip_for_each_data,
 	     const char **label, int *i)
 
 /**
+ * for_each_hwgpio_in_range - Iterates over all GPIOs in a given range
+ * @_chip: Chip to iterate over.
+ * @_i: Loop counter.
+ * @_base: First GPIO in the ranger.
+ * @_size: Amount of GPIOs to check starting from @base.
+ * @_label: Place to store the address of the label if the GPIO is requested.
+ *          Set to NULL for unused GPIOs.
+ */
+#define for_each_hwgpio_in_range(_chip, _i, _base, _size, _label)			\
+	for (CLASS(_gpiochip_for_each_data, _data)(&_label, &_i);			\
+	     _i < _size;								\
+	     _i++, kfree(_label), _label = NULL)					\
+		for_each_if(!IS_ERR(_label = gpiochip_dup_line_label(_chip, _base + _i)))
+
+/**
  * for_each_hwgpio - Iterates over all GPIOs for given chip.
  * @_chip: Chip to iterate over.
  * @_i: Loop counter.
  * @_label: Place to store the address of the label if the GPIO is requested.
  *          Set to NULL for unused GPIOs.
  */
-#define for_each_hwgpio(_chip, _i, _label) \
-	for (CLASS(_gpiochip_for_each_data, _data)(&_label, &_i); \
-	     *_data.i < _chip->ngpio; \
-	     (*_data.i)++, kfree(*(_data.label)), *_data.label = NULL) \
-		if (IS_ERR(*_data.label = \
-			gpiochip_dup_line_label(_chip, *_data.i))) {} \
-		else
+#define for_each_hwgpio(_chip, _i, _label)						\
+	for_each_hwgpio_in_range(_chip, _i, 0, _chip->ngpio, _label)
 
 /**
  * for_each_requested_gpio_in_range - iterates over requested GPIOs in a given range
@@ -573,13 +612,8 @@ DEFINE_CLASS(_gpiochip_for_each_data,
  * @_label:	label of current GPIO
  */
 #define for_each_requested_gpio_in_range(_chip, _i, _base, _size, _label)		\
-	for (CLASS(_gpiochip_for_each_data, _data)(&_label, &_i);			\
-	     *_data.i < _size;								\
-	     (*_data.i)++, kfree(*(_data.label)), *_data.label = NULL)			\
-		if ((*_data.label =							\
-			gpiochip_dup_line_label(_chip, _base + *_data.i)) == NULL) {}	\
-		else if (IS_ERR(*_data.label)) {}					\
-		else
+	for_each_hwgpio_in_range(_chip, _i, _base, _size, _label)			\
+		for_each_if(_label)
 
 /* Iterates over all requested GPIO of the given @chip */
 #define for_each_requested_gpio(chip, i, label)						\
@@ -678,6 +712,7 @@ bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset);
 /* Sleep persistence inquiry for drivers */
 bool gpiochip_line_is_persistent(struct gpio_chip *gc, unsigned int offset);
 bool gpiochip_line_is_valid(const struct gpio_chip *gc, unsigned int offset);
+const unsigned long *gpiochip_query_valid_mask(const struct gpio_chip *gc);
 
 /* get driver data */
 void *gpiochip_get_data(struct gpio_chip *gc);
@@ -713,6 +748,7 @@ int bgpio_init(struct gpio_chip *gc, struct device *dev,
 #define BGPIOF_READ_OUTPUT_REG_SET	BIT(4) /* reg_set stores output value */
 #define BGPIOF_NO_OUTPUT		BIT(5) /* only input */
 #define BGPIOF_NO_SET_ON_INPUT		BIT(6)
+#define BGPIOF_PINCTRL_BACKEND		BIT(7) /* Call pinctrl direction setters */
 
 #ifdef CONFIG_GPIOLIB_IRQCHIP
 int gpiochip_irqchip_add_domain(struct gpio_chip *gc,
@@ -865,7 +901,7 @@ static inline void gpiochip_unlock_as_irq(struct gpio_chip *gc,
 
 #define for_each_gpiochip_node(dev, child)					\
 	device_for_each_child_node(dev, child)					\
-		if (!fwnode_property_present(child, "gpio-controller")) {} else
+		for_each_if(fwnode_property_present(child, "gpio-controller"))
 
 static inline unsigned int gpiochip_node_count(struct device *dev)
 {
diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h
index a9f7b7faf57b..c722c67668c6 100644
--- a/include/linux/gpio/regmap.h
+++ b/include/linux/gpio/regmap.h
@@ -21,7 +21,7 @@ struct regmap;
  *			If not given, the fwnode of the parent is used.
  * @label:		(Optional) Descriptive name for GPIO controller.
  *			If not given, the name of the device is used.
- * @ngpio:		Number of GPIOs
+ * @ngpio:		(Optional) Number of GPIOs
  * @names:		(Optional) Array of names for gpios
  * @reg_dat_base:	(Optional) (in) register base address
  * @reg_set_base:	(Optional) set register base address
@@ -30,7 +30,7 @@ struct regmap;
  * @reg_dir_out_base:	(Optional) out setting register base address
  * @reg_stride:		(Optional) May be set if the registers (of the
  *			same type, dat, set, etc) are not consecutive.
- * @ngpio_per_reg:	Number of GPIOs per register
+ * @ngpio_per_reg:	(Optional) Number of GPIOs per register
  * @irq_domain:		(Optional) IRQ domain if the controller is
  *			interrupt-capable
  * @reg_mask_xlate:     (Optional) Translates base address and GPIO