diff mbox series

[v4,20/20] mfd: adp5585: add support for a reset pin

Message ID 20250521-dev-adp5589-fw-v4-20-f2c988d7a7a0@analog.com
State New
Headers show
Series [v4,01/20] dt-bindings: mfd: adp5585: ease on the required properties | expand

Commit Message

Nuno Sá via B4 Relay May 21, 2025, 1:03 p.m. UTC 
From: Nuno Sá <nuno.sa@analog.com>

Make sure to perform an Hardware reset during probe  if the pin is given
in FW.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
 drivers/mfd/adp5585.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
diff mbox series

Patch

diff --git a/drivers/mfd/adp5585.c b/drivers/mfd/adp5585.c
index e8b9a0ef4ee654ac1abc4042152fe0933f1d9f0d..164da0b804c4fce4e3af1ac0c2813020a77f4938 100644
--- a/drivers/mfd/adp5585.c
+++ b/drivers/mfd/adp5585.c
@@ -12,6 +12,7 @@ 
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
+#include <linux/gpio/consumer.h>
 #include <linux/mfd/adp5585.h>
 #include <linux/mfd/core.h>
 #include <linux/mod_devicetable.h>
@@ -697,6 +698,7 @@  static int adp5585_i2c_probe(struct i2c_client *i2c)
 {
 	struct regmap_config regmap_config;
 	struct adp5585_dev *adp5585;
+	struct gpio_desc *gpio;
 	unsigned int id;
 	int ret;
 
@@ -718,6 +720,20 @@  static int adp5585_i2c_probe(struct i2c_client *i2c)
 	if (ret)
 		return ret;
 
+	gpio = devm_gpiod_get_optional(&i2c->dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(gpio))
+		return PTR_ERR(gpio);
+
+	/*
+	 * Note the timings are not documented anywhere in the DS. They are just
+	 * reasonable values that work.
+	 */
+	if (gpio) {
+		fsleep(30);
+		gpiod_set_value_cansleep(gpio, 0);
+		fsleep(60);
+	}
+
 	adp5585->regmap = devm_regmap_init_i2c(i2c, &regmap_config);
 	if (IS_ERR(adp5585->regmap))
 		return dev_err_probe(&i2c->dev, PTR_ERR(adp5585->regmap),