gpio: of: Extract of_gpiochip_add_hog()

Extract the code to add all GPIO hogs of a gpio-hog node into its own
function, so it can be reused.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200220130149.26283-2-geert+renesas@glider.beReviewed-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib-of.c

@@ -604,6 +604,35 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
 	return desc;
 }
 
+/**
+ * of_gpiochip_add_hog - Add all hogs in a hog device node
+ * @chip:	gpio chip to act on
+ * @hog:	device node describing the hogs
+ *
+ * Returns error if it fails otherwise 0 on success.
+ */
+static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog)
+{
+	enum gpiod_flags dflags;
+	struct gpio_desc *desc;
+	unsigned long lflags;
+	const char *name;
+	unsigned int i;
+	int ret;
+
+	for (i = 0;; i++) {
+		desc = of_parse_own_gpio(hog, chip, i, &name, &lflags, &dflags);
+		if (IS_ERR(desc))
+			break;
+
+		ret = gpiod_hog(desc, name, lflags, dflags);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
 /**
  * of_gpiochip_scan_gpios - Scan gpio-controller for gpio definitions
  * @chip:	gpio chip to act on
@@ -614,31 +643,19 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
  */
 static int of_gpiochip_scan_gpios(struct gpio_chip *chip)
 {
-	struct gpio_desc *desc = NULL;
 	struct device_node *np;
-	const char *name;
-	unsigned long lflags;
-	enum gpiod_flags dflags;
-	unsigned int i;
 	int ret;
 
 	for_each_available_child_of_node(chip->of_node, np) {
 		if (!of_property_read_bool(np, "gpio-hog"))
 			continue;
 
-		for (i = 0;; i++) {
-			desc = of_parse_own_gpio(np, chip, i, &name, &lflags,
-						 &dflags);
-			if (IS_ERR(desc))
-				break;
-
-			ret = gpiod_hog(desc, name, lflags, dflags);
+		ret = of_gpiochip_add_hog(chip, np);
 		if (ret < 0) {
 			of_node_put(np);
 			return ret;
 		}
 	}
-	}
 
 	return 0;
 }