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@xxxxxxx>
---
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
