From dddb4e38c6ba3f7ff5202d556982a0c82fa9a240 Mon Sep 17 00:00:00 2001 From: Grant Feng Date: Tue, 25 Aug 2020 16:22:05 +0800 Subject: leds: is31fl319x: Add shutdown pin and generate a 5ms low pulse when startup generate a 5ms low pulse on shutdown pin when startup, then the chip becomes more stable in the complex EM environment. Signed-off-by: Grant Feng Signed-off-by: Pavel Machek --- drivers/leds/leds-is31fl319x.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'drivers/leds') diff --git a/drivers/leds/leds-is31fl319x.c b/drivers/leds/leds-is31fl319x.c index ca6634b8683c..54ac50740d43 100644 --- a/drivers/leds/leds-is31fl319x.c +++ b/drivers/leds/leds-is31fl319x.c @@ -16,6 +16,8 @@ #include #include #include +#include +#include /* 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 *shutdown_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->shutdown_gpio = devm_gpiod_get_optional(dev, + "shutdown", + GPIOD_OUT_HIGH); + if (IS_ERR(is31->shutdown_gpio)) { + ret = PTR_ERR(is31->shutdown_gpio); + dev_err(dev, "Failed to get shutdown 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->shutdown_gpio) { + gpiod_direction_output(is31->shutdown_gpio, 0); + mdelay(5); + gpiod_direction_output(is31->shutdown_gpio, 1); + } + is31->client = client; is31->regmap = devm_regmap_init_i2c(client, ®map_config); if (IS_ERR(is31->regmap)) { -- cgit v1.2.3-59-g8ed1b