[PATCH v1] leds: is31fl32xx: 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-is31fl32xx.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/leds-is31fl32xx.c b/drivers/leds/leds-is31fl32xx.c
index cd768f991da1..e0f8734223c0 100644
--- a/drivers/leds/leds-is31fl32xx.c
+++ b/drivers/leds/leds-is31fl32xx.c
@@ -16,6 +16,8 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
 
 /* Used to indicate a device has no such register */
 #define IS31FL32XX_REG_NONE 0xFF
@@ -43,6 +45,7 @@ struct is31fl32xx_led_data {
 struct is31fl32xx_priv {
        const struct is31fl32xx_chipdef *cdef;
        struct i2c_client *client;
+       struct gpio_desc *sdb_pin;
        unsigned int num_leds;
        struct is31fl32xx_led_data leds[];
 };
@@ -405,6 +408,15 @@ static int is31fl32xx_parse_dt(struct device *dev,
                priv->num_leds++;
        }
 
+       priv->sdb_pin = gpiod_get(dev, "sdb", GPIOD_ASIS);
+       if (IS_ERR(priv->sdb_pin)) {
+               dev_warn(dev, "failed to get SDB GPIO, try default\r\n");
+       } else {
+               gpiod_direction_output(priv->sdb_pin, 0);
+               mdelay(5);
+               gpiod_direction_output(priv->sdb_pin, 1);
+       }
+
        return 0;
 
 err:
@@ -453,11 +465,11 @@ static int is31fl32xx_probe(struct i2c_client *client,
        priv->cdef = cdef;
        i2c_set_clientdata(client, priv);
 
-       ret = is31fl32xx_init_regs(priv);
+       ret = is31fl32xx_parse_dt(dev, priv);
        if (ret)
                return ret;
 
-       ret = is31fl32xx_parse_dt(dev, priv);
+       ret = is31fl32xx_init_regs(priv);
        if (ret)
                return ret;
 
-- 
2.17.1