linux-kernel - [PATCH v2 1/2] gpio: fxl6408: Add optional reset gpio control

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Message-ID: <20251117001502.12618-2-jszhang@kernel.org>
Date: Mon, 17 Nov 2025 08:15:01 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] gpio: fxl6408: Add optional reset gpio control

Add optional active low reset-gpios pin control. If present, de-assert
the specified reset gpio pin to bring the chip out of reset.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 drivers/gpio/gpio-fxl6408.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpio/gpio-fxl6408.c b/drivers/gpio/gpio-fxl6408.c
index 86ebc66b1104..7074831639ce 100644
--- a/drivers/gpio/gpio-fxl6408.c
+++ b/drivers/gpio/gpio-fxl6408.c
@@ -13,6 +13,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 
 #define FXL6408_REG_DEVICE_ID		0x01
 #define FXL6408_MF_FAIRCHILD		0b101
@@ -104,6 +105,7 @@ static int fxl6408_identify(struct device *dev, struct regmap *regmap)
 static int fxl6408_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
+	struct gpio_desc *reset_gpio;
 	int ret;
 	struct gpio_regmap_config gpio_config = {
 		.parent = dev,
@@ -114,6 +116,10 @@ static int fxl6408_probe(struct i2c_client *client)
 		.ngpio_per_reg = FXL6408_NGPIO,
 	};
 
+	reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(reset_gpio), "Failed to get reset gpio\n");
+
 	gpio_config.regmap = devm_regmap_init_i2c(client, &regmap);
 	if (IS_ERR(gpio_config.regmap))
 		return dev_err_probe(dev, PTR_ERR(gpio_config.regmap),
-- 
2.51.0