linux-kernel - [PATCH 1/2] leds: is31fl319x: Add sdb pin and generate a 5ms low pulse when startup

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Message-Id: <20200806062130.25187-1-von81@163.com>
Date:   Thu,  6 Aug 2020 14:21:29 +0800
From:   Grant Feng <von81@....com>
To:     von81@....com, jacek.anaszewski@...il.com, pavel@....cz,
        dmurphy@...com, robh+dt@...nel.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] leds: is31fl319x: Add sdb pin and generate a 5ms low pulse when startup

generate a 5ms low pulse on sdb pin when startup, then the chip
becomes more stable in the complex EM environment.

Signed-off-by: Grant Feng <von81@....com>
---
 drivers/leds/leds-is31fl319x.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/leds/leds-is31fl319x.c b/drivers/leds/leds-is31fl319x.c
index ca6634b8683c..b4f70002cec9 100644
--- a/drivers/leds/leds-is31fl319x.c
+++ b/drivers/leds/leds-is31fl319x.c
@@ -16,6 +16,8 @@
 #include <linux/of_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
 
 /* register numbers */
 #define IS31FL319X_SHUTDOWN		0x00
@@ -61,6 +63,7 @@
 struct is31fl319x_chip {
 	const struct is31fl319x_chipdef *cdef;
 	struct i2c_client               *client;
+	struct gpio_desc		*sdb_pin;
 	struct regmap                   *regmap;
 	struct mutex                    lock;
 	u32                             audio_gain_db;
@@ -265,6 +268,15 @@ static int is31fl319x_parse_dt(struct device *dev,
 		is31->audio_gain_db = min(is31->audio_gain_db,
 					  IS31FL319X_AUDIO_GAIN_DB_MAX);
 
+	is31->sdb_pin = gpiod_get(dev, "sdb", GPIOD_ASIS);
+	if (IS_ERR(is31->sdb_pin)) {
+		dev_warn(dev, "failed to get gpio_sdb, try default\r\n");
+	} else {
+		gpiod_direction_output(is31->sdb_pin, 0);
+		mdelay(5);
+		gpiod_direction_output(is31->sdb_pin, 1);
+	}
+
 	return 0;
 
 put_child_node:
-- 
2.17.1