linux-kernel - [PATCH v4 08/10] input: keyboard: adp5588-keys: add optional reset gpio

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Date:   Mon, 29 Aug 2022 15:15:51 +0200
From:   Nuno Sá <nuno.sa@...log.com>
To:     <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        <devicetree@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        <linux-input@...r.kernel.org>,
        Nuno Sá <nuno.sa@...log.com>
CC:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Hennerich <michael.hennerich@...log.com>
Subject: [PATCH v4 08/10] input: keyboard: adp5588-keys: add optional reset gpio

Optionally reset the device during probe.

Signed-off-by: Nuno Sá <nuno.sa@...log.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
 drivers/input/keyboard/adp5588-keys.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/input/keyboard/adp5588-keys.c b/drivers/input/keyboard/adp5588-keys.c
index 3a234ec37fd4..b2bb7c6702e1 100644
--- a/drivers/input/keyboard/adp5588-keys.c
+++ b/drivers/input/keyboard/adp5588-keys.c
@@ -11,6 +11,7 @@
 #include <linux/bits.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
+#include <linux/gpio/consumer.h>
 #include <linux/gpio/driver.h>
 #include <linux/i2c.h>
 #include <linux/input.h>
@@ -715,6 +716,7 @@ static int adp5588_probe(struct i2c_client *client,
 {
 	struct adp5588_kpad *kpad;
 	struct input_dev *input;
+	struct gpio_desc *gpio;
 	unsigned int revid;
 	int ret;
 	int error;
@@ -740,6 +742,16 @@ static int adp5588_probe(struct i2c_client *client,
 	if (error)
 		return error;
 
+	gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(gpio))
+		return PTR_ERR(gpio);
+
+	if (gpio) {
+		fsleep(30);
+		gpiod_set_value_cansleep(gpio, 0);
+		fsleep(60);
+	}
+
 	ret = adp5588_read(client, DEV_ID);
 	if (ret < 0)
 		return ret;
-- 
2.37.2