diff options
| author | Grant Feng <von81@163.com> | 2020-08-25 11:22:05 +0300 |
|---|---|---|
| committer | Pavel Machek <pavel@ucw.cz> | 2020-09-09 12:16:59 +0300 |
| commit | dddb4e38c6ba3f7ff5202d556982a0c82fa9a240 (patch) | |
| tree | 4e44a858e95718f98bffc67b0ad7fb6cf9e66ffc /drivers/leds | |
| parent | 3d93edc77515c6f51fa9bbbe2185e2ec32bad024 (diff) | |
| download | linux-dddb4e38c6ba3f7ff5202d556982a0c82fa9a240.tar.xz | |
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 <von81@163.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/leds-is31fl319x.c | 18 |
1 files changed, 18 insertions, 0 deletions
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 <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 *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)) { |