[PATCH v2 1/2] leds: is31fl32xx: Add sdb pin and generate a 5ms low pulse when startup

[PATCH v2 1/2] 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 <von81@163.com>
---
 drivers/leds/leds-is31fl32xx.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/leds/leds-is31fl32xx.c b/drivers/leds/leds-is31fl32xx.c
index cd768f991da1..07b543120e06 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_gpio;
 	unsigned int num_leds;
 	struct is31fl32xx_led_data leds[];
 };
@@ -282,11 +285,17 @@ static int is31fl32xx_software_shutdown(struct is31fl32xx_priv *priv,
 	return 0;
 }
 
-static int is31fl32xx_init_regs(struct is31fl32xx_priv *priv)
+static int is31fl32xx_init(struct is31fl32xx_priv *priv)
 {
 	const struct is31fl32xx_chipdef *cdef = priv->cdef;
 	int ret;
 
+	if (priv->sdb_gpio) {
+		gpiod_direction_output(priv->sdb_gpio, 0);
+		mdelay(5);
+		gpiod_direction_output(priv->sdb_gpio, 1);
+	}
+
 	ret = is31fl32xx_reset_regs(priv);
 	if (ret)
 		return ret;
@@ -372,6 +381,15 @@ static int is31fl32xx_parse_dt(struct device *dev,
 	struct device_node *child;
 	int ret = 0;
 
+	priv->sdb_gpio = devm_gpiod_get_optional(dev,
+						"sdb",
+						GPIOD_OUT_HIGH);
+	if (IS_ERR(priv->sdb_gpio)) {
+		ret = PTR_ERR(priv->sdb_gpio);
+		dev_err(dev, "Failed to get sdb gpio: %d\n", ret);
+		return ret;
+	}
+
 	for_each_child_of_node(dev->of_node, child) {
 		struct is31fl32xx_led_data *led_data =
 			&priv->leds[priv->num_leds];
@@ -453,11 +471,11 @@ 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(priv);
 	if (ret)
 		return ret;
 
-- 
2.17.1

[PATCH v2 2/2] leds: Add an optional property named 'sdb-gpios'

[Grant Feng]

The chip enters hardware shutdown when the SDB pin is pulled low.
The chip releases hardware shutdown when the SDB pin is pulled high.

Signed-off-by: Grant Feng <von81@163.com>
---
 Documentation/devicetree/bindings/leds/leds-is31fl32xx.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/leds-is31fl32xx.txt b/Documentation/devicetree/bindings/leds/leds-is31fl32xx.txt
index 926c2117942c..94f02827fd83 100644
--- a/Documentation/devicetree/bindings/leds/leds-is31fl32xx.txt
+++ b/Documentation/devicetree/bindings/leds/leds-is31fl32xx.txt
@@ -15,6 +15,8 @@ Required properties:
 - reg: I2C slave address
 - address-cells : must be 1
 - size-cells : must be 0
+- sdb-gpios : (optional)
+  Specifier of the GPIO connected to SDB pin.
 
 LED sub-node properties:
 - reg : LED channel number (1..N)
@@ -31,6 +33,7 @@ is31fl3236: led-controller@3c {
 	reg = <0x3c>;
 	#address-cells = <1>;
 	#size-cells = <0>;
+	sdb-gpios = <&gpio0 11 GPIO_ACTIVE_HIGH>;
 
 	led@1 {
 		reg = <1>;
-- 
2.17.1