diff options
| -rw-r--r-- | Documentation/devicetree/bindings/sound/ak4104.txt | 5 | ||||
| -rw-r--r-- | sound/soc/codecs/ak4104.c | 17 |
2 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sound/ak4104.txt b/Documentation/devicetree/bindings/sound/ak4104.txt index 1f8e5066d44..b902ee39cf8 100644 --- a/Documentation/devicetree/bindings/sound/ak4104.txt +++ b/Documentation/devicetree/bindings/sound/ak4104.txt @@ -8,6 +8,11 @@ Required properties: - reg : The chip select number on the SPI bus +Optional properties: + + - reset-gpio : a GPIO spec for the reset pin. If specified, it will be + deasserted before communication to the device starts. + Example: spdif: ak4104@0 { diff --git a/sound/soc/codecs/ak4104.c b/sound/soc/codecs/ak4104.c index d4d48580889..eec086b226f 100644 --- a/sound/soc/codecs/ak4104.c +++ b/sound/soc/codecs/ak4104.c @@ -15,6 +15,8 @@ #include <sound/soc.h> #include <sound/initval.h> #include <linux/spi/spi.h> +#include <linux/of_device.h> +#include <linux/of_gpio.h> #include <sound/asoundef.h> /* AK4104 registers addresses */ @@ -204,6 +206,7 @@ static const struct regmap_config ak4104_regmap = { static int ak4104_spi_probe(struct spi_device *spi) { + struct device_node *np = spi->dev.of_node; struct ak4104_private *ak4104; unsigned int val; int ret; @@ -225,6 +228,20 @@ static int ak4104_spi_probe(struct spi_device *spi) return ret; } + 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(&spi->dev, gpio, + flags & OF_GPIO_ACTIVE_LOW ? + GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH, + "ak4104 reset"); + if (ret < 0) + return ret; + } + } + /* read the 'reserved' register - according to the datasheet, it * should contain 0x5b. Not a good way to verify the presence of * the device, but there is no hardware ID register. */ |