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Commit 385a4c2e authored by Daniel Mack's avatar Daniel Mack Committed by Mark Brown
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ASoC: ak4104: add reset line property to DT bindings 



This device doesn't have a pdata definition for legacy boards, and
unless anyone need to control the reset GPIO, it's not worth adding one.
So this feature is only available to DT users for now.

Signed-off-by: default avatarDaniel Mack <zonque@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent ac5dbea0

Documentation/devicetree/bindings/sound/ak4104.txt

+5 −0
Original line number Diff line number Diff line
@@ -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 {

sound/soc/codecs/ak4104.c

+17 −0
Original line number Diff line number Diff line
@@ -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. */