linux-kernel - [PATCH v4 3/7] gpio: gpio-rockchip: parse rockchip,gpio-controller property for bank id

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Date:   Thu, 23 Feb 2023 20:46:47 +0100
From:   Johan Jonker <jbx6244@...il.com>
To:     linus.walleij@...aro.org, brgl@...ev.pl
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        heiko@...ech.de, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/7] gpio: gpio-rockchip: parse rockchip,gpio-controller
 property for bank id

Parse the rockchip,gpio-controller property in Rockchip gpio nodes to be
independent from aliases and probe order for our bank id.

Signed-off-by: Johan Jonker <jbx6244@...il.com>
---
 drivers/gpio/gpio-rockchip.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index e5de15a2a..47e45299f 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -702,24 +702,38 @@ 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;
 	struct pinctrl_dev *pctldev = NULL;
 	struct rockchip_pin_bank *bank = NULL;
 	struct rockchip_pin_deferred *cfg;
+	struct of_phandle_args args;
 	static int gpio;
 	int id, ret;

-	if (!np || !pctlnp)
+	if (!np)
 		return -ENODEV;

+	ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &args);
+	if (!ret)
+		pctlnp = args.np;
+	else
+		pctlnp = of_get_parent(np);
+
+	if (!pctlnp)
+		return -ENODEV;
+
+	ret = of_property_read_u32(np, "rockchip,gpio-controller", &id);
+	if (ret)  {
+		id = of_alias_get_id(np, "gpio");
+		if (id < 0)
+			id = gpio++;
+	}
+
 	pctldev = of_pinctrl_get(pctlnp);
+	of_node_put(pctlnp);
 	if (!pctldev)
 		return -EPROBE_DEFER;

-	id = of_alias_get_id(np, "gpio");
-	if (id < 0)
-		id = gpio++;
-
 	bank = rockchip_gpio_find_bank(pctldev, id);
 	if (!bank)
 		return -EINVAL;
--
2.20.1