gpiolib: rename pin range arguments

To be crystal clear on what the arguments mean in this
funtion dealing with both GPIO and PIN ranges with confusing
naming, we now have gpio_offset and pin_offset and we are
on the clear that these are offsets into the specific GPIO
and pin controller respectively. The GPIO chip itself will
of course keep track of the base offset into the global
GPIO number space.

Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib.c

@@ -1191,13 +1191,13 @@ EXPORT_SYMBOL_GPL(gpiochip_find);
  * 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
- * @offset: the start offset in the current gpio_chip number space
- * @pin_base: the start offset in the pin controller number space
+ * @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
  */
 int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
-			   unsigned int offset, unsigned int pin_base,
+			   unsigned int gpio_offset, unsigned int pin_offset,
 			   unsigned int npins)
 {
 	struct gpio_pin_range *pin_range;
@@ -1210,11 +1210,11 @@ int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
 	}
 
 	/* Use local offset as range ID */
-	pin_range->range.id = offset;
+	pin_range->range.id = gpio_offset;
 	pin_range->range.gc = chip;
 	pin_range->range.name = chip->label;
-	pin_range->range.base = chip->base + offset;
-	pin_range->range.pin_base = pin_base;
+	pin_range->range.base = chip->base + gpio_offset;
+	pin_range->range.pin_base = pin_offset;
 	pin_range->range.npins = npins;
 	pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name,
 			&pin_range->range);
@@ -1224,9 +1224,10 @@ int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
 		kfree(pin_range);
 		return PTR_ERR(pin_range->pctldev);
 	}
-	pr_debug("%s: GPIO chip: created GPIO range %d->%d ==> PIN %d->%d\n",
-		 chip->label, offset, offset + npins - 1,
-		 pin_base, pin_base + npins - 1);
+	pr_debug("GPIO chip %s: created GPIO range %d->%d ==> %s PIN %d->%d\n",
+		 chip->label, gpio_offset, gpio_offset + npins - 1,
+		 pinctl_name,
+		 pin_offset, pin_offset + npins - 1);
 
 	list_add_tail(&pin_range->node, &chip->pin_ranges);
 

include/asm-generic/gpio.h

@@ -283,15 +283,15 @@ struct gpio_pin_range {
 };
 
 int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
-			   unsigned int offset, unsigned int pin_base,
+			   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 offset, unsigned int pin_base,
+		       unsigned int gpio_offset, unsigned int pin_offset,
 		       unsigned int npins)
 {
 	return 0;

include/linux/gpio.h

@@ -233,7 +233,7 @@ static inline int irq_to_gpio(unsigned irq)
 
 static inline int
 gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
-		       unsigned int offset, unsigned int pin_base,
+		       unsigned int gpio_offset, unsigned int pin_offset,
 		       unsigned int npins)
 {
 	WARN_ON(1);