[PATCH] pinctrl: fix pinctrl_gpio_get_pinctrl_and_offset for gpio-ranges array

[quanyang.wang at windriver.com]

From: Quanyang Wang <quanyang.wang at windriver.com>

Sometimes a multi-element array is used for "gpio-ranges" property in
dts file:

    qe_pio_e: gpio-controller at 1460 {
        ......
        gpio-ranges = <&pinctrl1 0 20 10>, <&pinctrl2 10 50 20>;
        ......
    };

But the function pinctrl_gpio_get_pinctrl_and_offset can't handle this
case because the "index" argument passed to dev_read_phandle_with_args
is fixed to be "0". Use a loop to traverse the array to fix it.

Signed-off-by: Quanyang Wang <quanyang.wang at windriver.com>
---
 drivers/pinctrl/pinctrl-uclass.c | 47 ++++++++++++++++----------------
 1 file changed, 23 insertions(+), 24 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-uclass.c b/drivers/pinctrl/pinctrl-uclass.c
index 8837726cc1..73dd7b1038 100644
--- a/drivers/pinctrl/pinctrl-uclass.c
+++ b/drivers/pinctrl/pinctrl-uclass.c
@@ -169,34 +169,33 @@ pinctrl_gpio_get_pinctrl_and_offset(struct udevice *dev, unsigned offset,
 {
 	struct ofnode_phandle_args args;
 	unsigned gpio_offset, pfc_base, pfc_pins;
-	int ret;
+	int ret = 0;
+	int i = 0;
 
-	ret = dev_read_phandle_with_args(dev, "gpio-ranges", NULL, 3,
-					 0, &args);
-	if (ret) {
-		dev_dbg(dev, "%s: dev_read_phandle_with_args: err=%d\n",
-			__func__, ret);
-		return ret;
-	}
+	while (ret == 0) {
+		ret = dev_read_phandle_with_args(dev, "gpio-ranges", NULL, 3,
+						 i++, &args);
+		if (ret) {
+			dev_dbg(dev, "%s: dev_read_phandle_with_args: err=%d\n",
+				__func__, ret);
+			return ret;
+		}
 
-	ret = uclass_get_device_by_ofnode(UCLASS_PINCTRL,
-					  args.node, pctldev);
-	if (ret) {
-		dev_dbg(dev,
-			"%s: uclass_get_device_by_of_offset failed: err=%d\n",
-			__func__, ret);
-		return ret;
-	}
+		ret = uclass_get_device_by_ofnode(UCLASS_PINCTRL,
+						  args.node, pctldev);
+		if (ret) {
+			dev_dbg(dev,
+				"%s: uclass_get_device_by_of_offset failed: err=%d\n",
+				__func__, ret);
+			return ret;
+		}
 
-	gpio_offset = args.args[0];
-	pfc_base = args.args[1];
-	pfc_pins = args.args[2];
+		gpio_offset = args.args[0];
+		pfc_base = args.args[1];
+		pfc_pins = args.args[2];
 
-	if (offset < gpio_offset || offset > gpio_offset + pfc_pins) {
-		dev_dbg(dev,
-			"%s: GPIO can not be mapped to pincontrol pin\n",
-			__func__);
-		return -EINVAL;
+		if (offset >= gpio_offset && offset <= gpio_offset + pfc_pins)
+			break;
 	}
 
 	offset -= gpio_offset;
-- 
2.36.1