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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: Jean-Jacques Hiblot <jjhiblot@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jean-Jacques Hiblot 2018-04-27 15:55:47 +02:00 committed by Mark Brown
parent b24c539b4d
commit e3976aa6fb
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2 changed files with 23 additions and 0 deletions
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1
Documentation/devicetree/bindings/sound/ti,tas6424.txt
View File

@ -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:

22
sound/soc/codecs/tas6424.c
View File

@ -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) {