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Unverified Commit e3976aa6 authored by Jean-Jacques Hiblot's avatar Jean-Jacques Hiblot Committed by Mark Brown
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ASoC: tas6424: Add support for the standby pin 



The standby pin can be connected to a GPIO. In that case we have to drive
it to the correct values for the TAS6424 to operate properly.

Signed-off-by: default avatarJean-Jacques Hiblot <jjhiblot@ti.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent b24c539b

Documentation/devicetree/bindings/sound/ti,tas6424.txt

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ Required properties: 
	- compatible: "ti,tas6424" - TAS6424

	- reg: I2C slave address

	- sound-dai-cells: must be equal to 0

	- standby-gpios: GPIO used to shut the TAS6424 down.



Example:

sound/soc/codecs/tas6424.c

+22 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/slab.h>

#include <linux/regulator/consumer.h>

#include <linux/delay.h>

#include <linux/gpio/consumer.h>



#include <sound/pcm.h>

#include <sound/pcm_params.h>
@@ -43,6 +44,7 @@ struct tas6424_data { 
	unsigned int last_fault1;

	unsigned int last_fault2;

	unsigned int last_warn;

	struct gpio_desc *standby_gpio;

};



/*
@@ -627,6 +629,22 @@ static int tas6424_i2c_probe(struct i2c_client *client, 
		return ret;

	}



	/*

	 * Get control of the standby pin and set it LOW to take the codec

	 * out of the stand-by mode.

	 * Note: The actual pin polarity is taken care of in the GPIO lib

	 * according the polarity specified in the DTS.

	 */

	tas6424->standby_gpio = devm_gpiod_get_optional(dev, "standby",

						      GPIOD_OUT_LOW);

	if (IS_ERR(tas6424->standby_gpio)) {

		if (PTR_ERR(tas6424->standby_gpio) == -EPROBE_DEFER)

			return -EPROBE_DEFER;

		dev_info(dev, "failed to get standby GPIO: %ld\n",

			PTR_ERR(tas6424->standby_gpio));

		tas6424->standby_gpio = NULL;

	}



	for (i = 0; i < ARRAY_SIZE(tas6424->supplies); i++)

		tas6424->supplies[i].supply = tas6424_supply_names[i];

	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tas6424->supplies),
@@ -671,6 +689,10 @@ static int tas6424_i2c_remove(struct i2c_client *client) 


	cancel_delayed_work_sync(&tas6424->fault_check_work);



	/* put the codec in stand-by */

	if (tas6424->standby_gpio)

		gpiod_set_value_cansleep(tas6424->standby_gpio, 1);



	ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),

				     tas6424->supplies);

	if (ret < 0) {