[PATCH 2/3] gpio: rockchip: get pinctrl node from 'gpio-ranges' property

[Jianqun Xu <jay.xu@xxxxxxxxxxxxxx>]

The dt nodes for rockchip soc designes as

    pinctrl: pinctrl {
        gpio {
	};
    };

Currently, we get the pinctrl dt node from parent of gpio, this patch
try to get pinctrl dt node from 'gpio-ranges' property.

After this patch, the dt nodes possible to be

    gpio {
        gpio-ranges = <&pinctrl xxx>;
    };

    pinctrl: pinctrl {
    };

then the gpio driver could register as platform device itself, but not
populate from pinctrl driver.

Signed-off-by: Jianqun Xu <jay.xu@xxxxxxxxxxxxxx>
---
 drivers/gpio/gpio-rockchip.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 1da0324445cc..46c54dff92db 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -690,6 +690,9 @@ rockchip_gpio_find_bank(struct pinctrl_dev *pctldev, int id)
 	int i, found = 0;
 
 	info = pinctrl_dev_get_drvdata(pctldev);
+	if (!info)
+		return NULL;
+
 	bank = info->ctrl->pin_banks;
 	for (i = 0; i < info->ctrl->nr_banks; i++, bank++) {
 		if (bank->bank_num == id) {
@@ -705,15 +708,16 @@ static int rockchip_gpio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
-	struct device_node *pctlnp = of_get_parent(np);
+	struct device_node *pctlnp = NULL;
 	struct pinctrl_dev *pctldev = NULL;
 	struct rockchip_pin_bank *bank = NULL;
 	struct rockchip_pin_output_deferred *cfg;
 	static int gpio;
 	int id, ret;
 
-	if (!np || !pctlnp)
-		return -ENODEV;
+	pctlnp = of_parse_phandle(np, "gpio-ranges", 0);
+	if (!pctlnp)
+		pctlnp = of_get_parent(np);
 
 	pctldev = of_pinctrl_get(pctlnp);
 	if (!pctldev)
-- 
2.25.1