[PATCH 3/5] gpiolib: add gpiochip_add_pinlist_range() function

[Thomas Richard <thomas.richard@xxxxxxxxxxx>]

Add gpiochip_add_pinlist_range() function to add a range for GPIO <-> pin
mapping, using a list of non consecutive pins.
Previously, it was only possible to add range of consecutive pins using
gpiochip_add_pin_range().

The struct pinctrl_gpio_range has a 'pins' member which allows to set a
list of pins (which can be non consecutive). gpiochip_add_pinlist_range()
is identical to gpiochip_add_pin_range(), except it set 'pins' member
instead of 'pin_base' member.

Signed-off-by: Thomas Richard <thomas.richard@xxxxxxxxxxx>
---
 drivers/gpio/gpiolib.c      | 74 +++++++++++++++++++++++++++++++++------------
 include/linux/gpio/driver.h | 12 ++++++++
 2 files changed, 66 insertions(+), 20 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 3c8ec7f3a83b..e0fe07167e62 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2227,26 +2227,9 @@ int gpiochip_add_pingroup_range(struct gpio_chip *gc,
 }
 EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range);
 
-/**
- * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping
- * @gc: the gpiochip to add the range for
- * @pinctl_name: the dev_name() of the pin controller to map to
- * @gpio_offset: the start offset in the current gpio_chip number space
- * @pin_offset: the start offset in the pin controller number space
- * @npins: the number of pins from the offset of each pin space (GPIO and
- *	pin controller) to accumulate in this range
- *
- * Calling this function directly from a DeviceTree-supported
- * pinctrl driver is DEPRECATED. Please see Section 2.1 of
- * Documentation/devicetree/bindings/gpio/gpio.txt on how to
- * bind pinctrl and gpio drivers via the "gpio-ranges" property.
- *
- * Returns:
- * 0 on success, or a negative errno on failure.
- */
-int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
-			   unsigned int gpio_offset, unsigned int pin_offset,
-			   unsigned int npins)
+static int __gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
+				    unsigned int gpio_offset, unsigned int pin_offset,
+				    unsigned int const *pins, unsigned int npins)
 {
 	struct gpio_pin_range *pin_range;
 	struct gpio_device *gdev = gc->gpiodev;
@@ -2264,6 +2247,7 @@ int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
 	pin_range->range.name = gc->label;
 	pin_range->range.base = gdev->base + gpio_offset;
 	pin_range->range.pin_base = pin_offset;
+	pin_range->range.pins = pins;
 	pin_range->range.npins = npins;
 	pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name,
 			&pin_range->range);
@@ -2282,8 +2266,58 @@ int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
 
 	return 0;
 }
+
+/**
+ * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping
+ * @gc: the gpiochip to add the range for
+ * @pinctl_name: the dev_name() of the pin controller to map to
+ * @gpio_offset: the start offset in the current gpio_chip number space
+ * @pin_offset: the start offset in the pin controller number space
+ * @npins: the number of pins from the offset of each pin space (GPIO and
+ *	pin controller) to accumulate in this range
+ *
+ * Calling this function directly from a DeviceTree-supported
+ * pinctrl driver is DEPRECATED. Please see Section 2.1 of
+ * Documentation/devicetree/bindings/gpio/gpio.txt on how to
+ * bind pinctrl and gpio drivers via the "gpio-ranges" property.
+ *
+ * Returns:
+ * 0 on success, or a negative errno on failure.
+ */
+int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
+			   unsigned int gpio_offset, unsigned int pin_offset,
+			   unsigned int npins)
+{
+	return __gpiochip_add_pin_range(gc, pinctl_name, gpio_offset,
+					pin_offset, NULL, npins);
+}
 EXPORT_SYMBOL_GPL(gpiochip_add_pin_range);
 
+/**
+ * gpiochip_add_pinlist_range() - add a range for GPIO <-> pin mapping
+ * @gc: the gpiochip to add the range for
+ * @pinctl_name: the dev_name() of the pin controller to map to
+ * @gpio_offset: the start offset in the current gpio_chip number space
+ * @pin_list: the list of pins to accumulate in this range
+ * @npins: the number of pins to accumulate in this range
+ *
+ * Calling this function directly from a DeviceTree-supported
+ * pinctrl driver is DEPRECATED. Please see Section 2.1 of
+ * Documentation/devicetree/bindings/gpio/gpio.txt on how to
+ * bind pinctrl and gpio drivers via the "gpio-ranges" property.
+ *
+ * Returns:
+ * 0 on success, or a negative errno on failure.
+ */
+int gpiochip_add_pinlist_range(struct gpio_chip *gc, const char *pinctl_name,
+			       unsigned int gpio_offset, unsigned int const *pins,
+			       unsigned int npins)
+{
+	return __gpiochip_add_pin_range(gc, pinctl_name, gpio_offset, 0, pins,
+					npins);
+}
+EXPORT_SYMBOL_GPL(gpiochip_add_pinlist_range);
+
 /**
  * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings
  * @gc: the chip to remove all the mappings for
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 2dd7cb9cc270..8037f9a1e2a9 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -751,6 +751,9 @@ struct gpio_pin_range {
 int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
 			   unsigned int gpio_offset, unsigned int pin_offset,
 			   unsigned int npins);
+int gpiochip_add_pinlist_range(struct gpio_chip *gc, const char *pinctl_name,
+			       unsigned int gpio_offset, unsigned int const *pins,
+			       unsigned int npins);
 int gpiochip_add_pingroup_range(struct gpio_chip *gc,
 			struct pinctrl_dev *pctldev,
 			unsigned int gpio_offset, const char *pin_group);
@@ -765,6 +768,15 @@ gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
 {
 	return 0;
 }
+
+static inline int
+gpiochip_add_pinlist_range(struct gpio_chip *gc, const char *pinctl_name,
+			   unsigned int gpio_offset, unsigned int const *pins,
+			   unsigned int npins)
+{
+	return 0;
+}
+
 static inline int
 gpiochip_add_pingroup_range(struct gpio_chip *gc,
 			struct pinctrl_dev *pctldev,

-- 
2.39.5