gpiolib: of: Integrate of_gpiochip_init_valid_mask() into gpiochip_init_valid_mask()

In preparation to complete fwnode switch, integrate
of_gpiochip_init_valid_mask() into gpiochip_init_valid_mask().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpiolib-of.c

@@ -112,24 +112,6 @@ static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip,
 	return gpiochip_get_desc(chip, ret);
 }
 
-/**
- * of_gpio_need_valid_mask() - figure out if the OF GPIO driver needs
- * to set the .valid_mask
- * @gc: the target gpio_chip
- *
- * Return: true if the valid mask needs to be set
- */
-bool of_gpio_need_valid_mask(const struct gpio_chip *gc)
-{
-	int size;
-	const struct device_node *np = gc->of_node;
-
-	size = of_property_count_u32_elems(np,  "gpio-reserved-ranges");
-	if (size > 0 && size % 2 == 0)
-		return true;
-	return false;
-}
-
 /*
  * Overrides stated polarity of a gpio line and warns when there is a
  * discrepancy.
@@ -989,28 +971,6 @@ void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc)
 }
 EXPORT_SYMBOL_GPL(of_mm_gpiochip_remove);
 
-static void of_gpiochip_init_valid_mask(struct gpio_chip *chip)
-{
-	int len, i;
-	u32 start, count;
-	struct device_node *np = chip->of_node;
-
-	len = of_property_count_u32_elems(np,  "gpio-reserved-ranges");
-	if (len < 0 || len % 2 != 0)
-		return;
-
-	for (i = 0; i < len; i += 2) {
-		of_property_read_u32_index(np, "gpio-reserved-ranges",
-					   i, &start);
-		of_property_read_u32_index(np, "gpio-reserved-ranges",
-					   i + 1, &count);
-		if (start >= chip->ngpio || start + count > chip->ngpio)
-			continue;
-
-		bitmap_clear(chip->valid_mask, start, count);
-	}
-};
-
 #ifdef CONFIG_PINCTRL
 static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
 {
@@ -1119,8 +1079,6 @@ int of_gpiochip_add(struct gpio_chip *chip)
 	if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS)
 		return -EINVAL;
 
-	of_gpiochip_init_valid_mask(chip);
-
 	ret = of_gpiochip_add_pin_range(chip);
 	if (ret)
 		return ret;

drivers/gpio/gpiolib-of.h

@@ -14,7 +14,6 @@ struct gpio_desc *of_find_gpio(struct device *dev,
 int of_gpiochip_add(struct gpio_chip *gc);
 void of_gpiochip_remove(struct gpio_chip *gc);
 int of_gpio_get_count(struct device *dev, const char *con_id);
-bool of_gpio_need_valid_mask(const struct gpio_chip *gc);
 void of_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev);
 #else
 static inline struct gpio_desc *of_find_gpio(struct device *dev,
@@ -30,10 +29,6 @@ static inline int of_gpio_get_count(struct device *dev, const char *con_id)
 {
 	return 0;
 }
-static inline bool of_gpio_need_valid_mask(const struct gpio_chip *gc)
-{
-	return false;
-}
 static inline void of_gpio_dev_init(struct gpio_chip *gc,
 				    struct gpio_device *gdev)
 {

drivers/gpio/gpiolib.c

@@ -445,9 +445,21 @@ static unsigned long *gpiochip_allocate_mask(struct gpio_chip *gc)
 	return p;
 }
 
+static unsigned int gpiochip_count_reserved_ranges(struct gpio_chip *gc)
+{
+	int size;
+
+	/* Format is "start, count, ..." */
+	size = fwnode_property_count_u32(gc->fwnode, "gpio-reserved-ranges");
+	if (size > 0 && size % 2 == 0)
+		return size;
+
+	return 0;
+}
+
 static int gpiochip_alloc_valid_mask(struct gpio_chip *gc)
 {
-	if (!(of_gpio_need_valid_mask(gc) || gc->init_valid_mask))
+	if (!(gpiochip_count_reserved_ranges(gc) || gc->init_valid_mask))
 		return 0;
 
 	gc->valid_mask = gpiochip_allocate_mask(gc);
@@ -457,8 +469,48 @@ static int gpiochip_alloc_valid_mask(struct gpio_chip *gc)
 	return 0;
 }
 
+static int gpiochip_apply_reserved_ranges(struct gpio_chip *gc)
+{
+	unsigned int size;
+	u32 *ranges;
+	int ret;
+
+	size = gpiochip_count_reserved_ranges(gc);
+	if (size == 0)
+		return 0;
+
+	ranges = kmalloc_array(size, sizeof(*ranges), GFP_KERNEL);
+	if (!ranges)
+		return -ENOMEM;
+
+	ret = fwnode_property_read_u32_array(gc->fwnode, "gpio-reserved-ranges", ranges, size);
+	if (ret) {
+		kfree(ranges);
+		return ret;
+	}
+
+	while (size) {
+		u32 count = ranges[--size];
+		u32 start = ranges[--size];
+
+		if (start >= gc->ngpio || start + count > gc->ngpio)
+			continue;
+
+		bitmap_clear(gc->valid_mask, start, count);
+	}
+
+	kfree(ranges);
+	return 0;
+}
+
 static int gpiochip_init_valid_mask(struct gpio_chip *gc)
 {
+	int ret;
+
+	ret = gpiochip_apply_reserved_ranges(gc);
+	if (ret)
+		return ret;
+
 	if (gc->init_valid_mask)
 		return gc->init_valid_mask(gc,
 					   gc->valid_mask,