[PATCH v2 2/2] ASoC: codecs: es8316: Add regulator support

[Hongyang Zhao]

ES8316 has separate AVDD, CPVDD, DVDD and PVDD supply inputs.

Request and enable the supplies during I2C probe, before initializing
the regmap. Keep them enabled for the lifetime of the I2C device so the
regmap cannot access an unpowered device and its cache remains
synchronized if the ASoC component is unbound and rebound.

Signed-off-by: Hongyang Zhao <hongyang.zhao@xxxxxxxxxxxxxxx>
---
 sound/soc/codecs/es8316.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/sound/soc/codecs/es8316.c b/sound/soc/codecs/es8316.c
index 87f331868dc7..24ec8b211cdb 100644
--- a/sound/soc/codecs/es8316.c
+++ b/sound/soc/codecs/es8316.c
@@ -15,6 +15,7 @@
 #include <linux/i2c.h>
 #include <linux/mutex.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
@@ -31,6 +32,13 @@ static const unsigned int supported_mclk_lrck_ratios[] = {
 	256, 384, 400, 500, 512, 768, 1024
 };
 
+static const char * const es8316_supply_names[] = {
+	"avdd",
+	"cpvdd",
+	"dvdd",
+	"pvdd",
+};
+
 struct es8316_priv {
 	struct mutex lock;
 	struct clk *mclk;
@@ -866,6 +874,11 @@ static int es8316_i2c_probe(struct i2c_client *i2c_client)
 
 	i2c_set_clientdata(i2c_client, es8316);
 
+	ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(es8316_supply_names),
+					     es8316_supply_names);
+	if (ret)
+		return dev_err_probe(dev, ret, "unable to enable supplies\n");
+
 	es8316->regmap = devm_regmap_init_i2c(i2c_client, &es8316_regmap);
 	if (IS_ERR(es8316->regmap))
 		return PTR_ERR(es8316->regmap);

-- 
2.43.0