[PATCH v2 1/2] leds: is31fl319x: Add sdb pin and generate a 5ms low pulse when startup

[PATCH v2 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 <von81@163.com>
---
 drivers/leds/leds-is31fl319x.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/leds/leds-is31fl319x.c b/drivers/leds/leds-is31fl319x.c
index ca6634b8683c..5c499a5895e0 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_gpio;
 	struct regmap                   *regmap;
 	struct mutex                    lock;
 	u32                             audio_gain_db;
@@ -207,6 +210,15 @@ static int is31fl319x_parse_dt(struct device *dev,
 	if (!np)
 		return -ENODEV;
 
+	is31->sdb_gpio = devm_gpiod_get_optional(dev,
+						"sdb",
+						GPIOD_OUT_HIGH);
+	if (IS_ERR(is31->sdb_gpio)) {
+		ret = PTR_ERR(is31->sdb_gpio);
+		dev_err(dev, "Failed to get sdb gpio: %d\n", ret);
+		return ret;
+	}
+
 	of_dev_id = of_match_device(of_is31fl319x_match, dev);
 	if (!of_dev_id) {
 		dev_err(dev, "Failed to match device with supported chips\n");
@@ -350,6 +362,12 @@ static int is31fl319x_probe(struct i2c_client *client,
 	if (err)
 		goto free_mutex;
 
+	if (is31->sdb_gpio) {
+		gpiod_direction_output(is31->sdb_gpio, 0);
+		mdelay(5);
+		gpiod_direction_output(is31->sdb_gpio, 1);
+	}
+
 	is31->client = client;
 	is31->regmap = devm_regmap_init_i2c(client, &regmap_config);
 	if (IS_ERR(is31->regmap)) {
-- 
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-is31fl319x.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt b/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt
index fc2603484544..e8bef4be57dc 100644
--- a/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt
+++ b/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt
@@ -16,6 +16,7 @@ Optional properties:
 - audio-gain-db : audio gain selection for external analog modulation input.
 	Valid values: 0 - 21, step by 3 (rounded down)
 	Default: 0
+- sdb-gpios : Specifier of the GPIO connected to SDB pin.
 
 Each led is represented as a sub-node of the issi,is31fl319x device.
 There can be less leds subnodes than the chip can support but not more.
@@ -44,6 +45,7 @@ fancy_leds: leds@65 {
 	#address-cells = <1>;
 	#size-cells = <0>;
 	reg = <0x65>;
+	sdb-gpios = <&gpio0 11 GPIO_ACTIVE_HIGH>;
 
 	red_aux: led@1 {
 		label = "red:aux";
-- 
2.17.1

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

[Rob Herring]

On Sat, Aug 08, 2020 at 11:37:31AM +0800, Grant Feng wrote:
> 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-is31fl319x.txt | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt b/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt
> index fc2603484544..e8bef4be57dc 100644
> --- a/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt
> +++ b/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt
> @@ -16,6 +16,7 @@ Optional properties:
>  - audio-gain-db : audio gain selection for external analog modulation input.
>  	Valid values: 0 - 21, step by 3 (rounded down)
>  	Default: 0
> +- sdb-gpios : Specifier of the GPIO connected to SDB pin.

We normally use 'shutdown-gpios' for a shutdown GPIO.

>  
>  Each led is represented as a sub-node of the issi,is31fl319x device.
>  There can be less leds subnodes than the chip can support but not more.
> @@ -44,6 +45,7 @@ fancy_leds: leds@65 {
>  	#address-cells = <1>;
>  	#size-cells = <0>;
>  	reg = <0x65>;
> +	sdb-gpios = <&gpio0 11 GPIO_ACTIVE_HIGH>;
>  
>  	red_aux: led@1 {
>  		label = "red:aux";
> -- 
> 2.17.1
> 
> 

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

[Grant Feng]

On 2020-08-25 6:21, Rob Herring wrote:
> On Sat, Aug 08, 2020 at 11:37:31AM +0800, Grant Feng wrote:
>> 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-is31fl319x.txt | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt b/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt
>> index fc2603484544..e8bef4be57dc 100644
>> --- a/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt
>> +++ b/Documentation/devicetree/bindings/leds/leds-is31fl319x.txt
>> @@ -16,6 +16,7 @@ Optional properties:
>>   - audio-gain-db : audio gain selection for external analog modulation input.
>>   	Valid values: 0 - 21, step by 3 (rounded down)
>>   	Default: 0
>> +- sdb-gpios : Specifier of the GPIO connected to SDB pin.
> We normally use 'shutdown-gpios' for a shutdown GPIO.
Thanks for the review.
>>   
>>   Each led is represented as a sub-node of the issi,is31fl319x device.
>>   There can be less leds subnodes than the chip can support but not more.
>> @@ -44,6 +45,7 @@ fancy_leds: leds@65 {
>>   	#address-cells = <1>;
>>   	#size-cells = <0>;
>>   	reg = <0x65>;
>> +	sdb-gpios = <&gpio0 11 GPIO_ACTIVE_HIGH>;
>>   
>>   	red_aux: led@1 {
>>   		label = "red:aux";
>> -- 
>> 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