1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 86ef3461ec06..b83b7e491f76 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1320,6 +1320,53 @@ EXPORT_SYMBOL_GPL(gpiochip_find);
 #ifdef CONFIG_PINCTRL
 
 /**
+ * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping
+ * @chip: the gpiochip to add the range for
+ * @pinctrl: the dev_name() of the pin controller to map to
+ * @gpio_offset: the start offset in the current gpio_chip number space
+ * @pin_group: name of the pin group inside the pin controller
+ */
+int gpiochip_add_pingroup_range(struct gpio_chip *chip,
+                        struct pinctrl_dev *pctldev,
+                        unsigned int gpio_offset, const char *pin_group)
+{
+        struct gpio_pin_range *pin_range;
+        int ret;
+
+        pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
+        if (!pin_range) {
+                pr_err("%s: GPIO chip: failed to allocate pin ranges\n",
+                                chip->label);
+                return -ENOMEM;
+        }
+
+        /* Use local offset as range ID */
+        pin_range->range.id = gpio_offset;
+        pin_range->range.gc = chip;
+        pin_range->range.name = chip->label;
+        pin_range->range.base = chip->base + gpio_offset;
+        pin_range->pctldev = pctldev;
+
+        ret = pinctrl_get_group_pins(pctldev, pin_group,
+                                        &pin_range->range.pins,
+                                        &pin_range->range.npins);
+        if (ret < 0)
+                return ret;
+
+        pinctrl_add_gpio_range(pctldev, &pin_range->range);
+
+        pr_debug("GPIO chip %s: created GPIO range %d->%d ==> %s PINGRP %s\n",
+                 chip->label, gpio_offset,
+                 gpio_offset + pin_range->range.npins - 1,
+                 pinctrl_dev_get_devname(pctldev), pin_group);
+
+        list_add_tail(&pin_range->node, &chip->pin_ranges);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range);
+
+/**
  * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping
  * @chip: the gpiochip to add the range for
  * @pinctrl_name: the dev_name() of the pin controller to map to