Unverified Commit 4d67dc19 authored by Alejandro Tafalla's avatar Alejandro Tafalla Committed by Mark Brown
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ASoC: max98927: Handle reset gpio when probing i2c 



The max98927 codec on some devices requires pulling a reset gpio before
responding to any i2c command. This commit adds support for it through
an optional reset-gpios property.

Signed-off-by: default avatarAlejandro Tafalla <atafalla@dnyon.com>
Link: https://lore.kernel.org/r/d74b12a79ae9ca728d5d9e64c55b3e59e8c0e509.1633572679.git.atafalla@dnyon.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent dc1fad25

sound/soc/codecs/max98927.c

+25 −0
Original line number Diff line number Diff line
@@ -898,6 +898,19 @@ static int max98927_i2c_probe(struct i2c_client *i2c, 
		return ret;

	}

	

	max98927->reset_gpio 

		= devm_gpiod_get_optional(&i2c->dev, "reset", GPIOD_OUT_HIGH);

	if (IS_ERR(max98927->reset_gpio)) {

		ret = PTR_ERR(max98927->reset_gpio);

		return dev_err_probe(&i2c->dev, ret, "failed to request GPIO reset pin");

	}



	if (max98927->reset_gpio) {

		gpiod_set_value_cansleep(max98927->reset_gpio, 0);

		/* Wait for i2c port to be ready */

		usleep_range(5000, 6000);

	}



	/* Check Revision ID */

	ret = regmap_read(max98927->regmap,

		MAX98927_R01FF_REV_ID, &reg);
@@ -921,6 +934,17 @@ static int max98927_i2c_probe(struct i2c_client *i2c, 
	return ret;

}



static int max98927_i2c_remove(struct i2c_client *i2c)

{

	struct max98927_priv *max98927 = i2c_get_clientdata(i2c);



	if (max98927->reset_gpio) {

		gpiod_set_value_cansleep(max98927->reset_gpio, 1);

	}



	return 0;

}



static const struct i2c_device_id max98927_i2c_id[] = {

	{ "max98927", 0},

	{ },
@@ -952,6 +976,7 @@ static struct i2c_driver max98927_i2c_driver = { 
		.pm = &max98927_pm,

	},

	.probe  = max98927_i2c_probe,

	.remove = max98927_i2c_remove,

	.id_table = max98927_i2c_id,

};

sound/soc/codecs/max98927.h

+1 −0
Original line number Diff line number Diff line
@@ -255,6 +255,7 @@ struct max98927_priv { 
	struct regmap *regmap;

	struct snd_soc_component *component;

	struct max98927_pdata *pdata;

	struct gpio_desc *reset_gpio; 

	unsigned int spk_gain;

	unsigned int sysclk;

	unsigned int v_l_slot;