diff options
Diffstat (limited to 'sound/soc/codecs/cs4270.c')
| -rw-r--r-- | sound/soc/codecs/cs4270.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c index 4b71b01..fd11bb6 100644 --- a/sound/soc/codecs/cs4270.c +++ b/sound/soc/codecs/cs4270.c @@ -30,6 +30,7 @@ #include <linux/delay.h> #include <linux/regulator/consumer.h> #include <linux/of_device.h> +#include <linux/of_gpio.h> /* * The codec isn't really big-endian or little-endian, since the I2S @@ -660,9 +661,25 @@ MODULE_DEVICE_TABLE(of, cs4270_of_match); static int cs4270_i2c_probe(struct i2c_client *i2c_client, const struct i2c_device_id *id) { + struct device_node *np = i2c_client->dev.of_node; struct cs4270_private *cs4270; int ret; + /* See if we have a way to bring the codec out of reset */ + if (np) { + enum of_gpio_flags flags; + int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags); + + if (gpio_is_valid(gpio)) { + ret = devm_gpio_request_one(&i2c_client->dev, gpio, + flags & OF_GPIO_ACTIVE_LOW ? + GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH, + "cs4270 reset"); + if (ret < 0) + return ret; + } + } + /* Verify that we have a CS4270 */ ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID); |