[PATCH v3 21/22] mfd: adp5585: add support for a reset pin

["Nuno Sá via B4 Relay" <devnull+nuno.sa.analog.com@kernel.org>]

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 --git a/drivers/mfd/adp5585.c b/drivers/mfd/adp5585.c
index 88401668f30e06ac201175470eeaf6216f3121d9..0fbe1f7f2582408b2e1b99f629182ceebce73fd7 100644
--- a/drivers/mfd/adp5585.c
+++ b/drivers/mfd/adp5585.c
@@ -11,6 +11,7 @@
 #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>
@@ -712,6 +713,7 @@ static int adp5585_i2c_probe(struct i2c_client *i2c)
 {
 	struct regmap_config regmap_config;
 	struct adp5585_dev *adp5585;
+	struct gpio_desc *gpio;
 	struct mfd_cell *devs;
 	unsigned int id;
 	int ret, n_devs;
@@ -730,6 +732,20 @@ 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),

-- 
2.49.0