linux-kernel - [PATCH v2 3/8] gpio: gpio-rockchip: parse gpio-ranges for bank id

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Message-ID: <890be9a0-8e82-a8f4-bc15-d5d1597343c2@gmail.com>
Date:   Sat, 21 Jan 2023 12:08:38 +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,
        kever.yang@...k-chips.com, sjg@...omium.org,
        philipp.tomsich@...ll.eu, john@...anate.com,
        quentin.schulz@...obroma-systems.com
Subject: [PATCH v2 3/8] gpio: gpio-rockchip: parse gpio-ranges for bank id

Parse the gpio-ranges 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 | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index e5de15a2a..df74b71aa 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -702,24 +702,36 @@ 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 == 0) {
+		pctlnp = args.np;
+		id = args.args[1] / 32;
+	} else {
+		pctlnp = of_get_parent(np);
+		id = of_alias_get_id(np, "gpio");
+		if (id < 0)
+			id = gpio++;
+	}
+
+	if (!pctlnp)
 		return -ENODEV;

 	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