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

[Grant Feng]

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 <vo...@163.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