2021-08-29 16:02:58

by Alejandro Tafalla

Subject: [PATCH 0/2] Add reset-gpios handling for max98927

The max98927 codec on some devices (i.e. Xiaomi Mi A2 Lite phone) require
hardware-resetting the codec by driving a reset-gpio. This series add
support for it through an optional reset-gpios property.

Alejandro Tafalla (2):
ASoC: max98927: Handle reset gpio when probing i2c
dt-bindings: sound: max98927: Add reset-gpios optional property

.../devicetree/bindings/sound/max9892x.txt | 3 +++
sound/soc/codecs/max98927.c | 16 ++++++++++++++++
sound/soc/codecs/max98927.h | 1 +
3 files changed, 20 insertions(+)

--
2.32.0

2021-08-29 16:02:58

by Alejandro Tafalla

Subject: [PATCH 1/2] ASoC: max98927: Handle reset gpio when probing i2c

Drive the reset gpio if defined in the DTS node.

Signed-off-by: Alejandro Tafalla <[email protected]>
---
sound/soc/codecs/max98927.c | 16 ++++++++++++++++
sound/soc/codecs/max98927.h | 1 +
2 files changed, 17 insertions(+)

diff --git a/sound/soc/codecs/max98927.c b/sound/soc/codecs/max98927.c
index 8b206ee77709..dacf64c4cdf7 100644
--- a/sound/soc/codecs/max98927.c
+++ b/sound/soc/codecs/max98927.c
@@ -898,6 +898,22 @@ 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);
+ dev_err(&i2c->dev,
+ "Failed to request GPIO reset pin, error %d\n", ret);
+ return ret;
+ }
+
+ if (max98927->reset_gpio) {
+ gpiod_set_value_cansleep(max98927->reset_gpio, 0);
+ usleep_range(5, 10)
+ gpiod_set_value_cansleep(max98927->reset_gpio, 1);
+ usleep_range(1, 5)
+ }
+
/* Check Revision ID */
ret = regmap_read(max98927->regmap,
MAX98927_R01FF_REV_ID, &reg);
diff --git a/sound/soc/codecs/max98927.h b/sound/soc/codecs/max98927.h
index 05f495db914d..5c04bf38e24a 100644
--- a/sound/soc/codecs/max98927.h
+++ b/sound/soc/codecs/max98927.h
@@ -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;
--
2.32.0