[PATCH v2 4/8] leds: pca995x: Add support for reset GPIO

[Nora Schiffer]

The PCA9952/9955B/9956B have a reset pin. Use it to reset the LED driver
if provided in the Device Tree.

Signed-off-by: Nora Schiffer <nora.schiffer@xxxxxxxxxxxxxxx>
---

v2:
- Use correct #includes
- Use udelay for small delay
- Use full hardware model names in commit description

 drivers/leds/leds-pca995x.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/leds/leds-pca995x.c b/drivers/leds/leds-pca995x.c
index 8b05b3f12cf38..0c0ea57f3225a 100644
--- a/drivers/leds/leds-pca995x.c
+++ b/drivers/leds/leds-pca995x.c
@@ -8,6 +8,8 @@
  * Copyright 2023 Marek Vasut
  */
 
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/leds.h>
 #include <linux/module.h>
@@ -121,6 +123,7 @@ static int pca995x_probe(struct i2c_client *client)
 	struct fwnode_handle *led_fwnodes[PCA995X_MAX_OUTPUTS] = { 0 };
 	struct device *dev = &client->dev;
 	const struct pca995x_chipdef *chipdef;
+	struct gpio_desc *reset_gpio;
 	struct pca995x_chip *chip;
 	struct pca995x_led *led;
 	int i, j, reg, ret;
@@ -130,6 +133,16 @@ static int pca995x_probe(struct i2c_client *client)
 	if (!dev_fwnode(dev))
 		return -ENODEV;
 
+	reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(reset_gpio),
+				     "failed to request reset GPIO\n");
+	if (reset_gpio) {
+		udelay(3);
+		gpiod_set_value_cansleep(reset_gpio, 0);
+		usleep_range(1500, 1600);
+	}
+
 	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;
-- 
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