[PATCH 1/2] ASoC: dt-bindings: ak4458: Add power supply property

[PATCH 1/2] ASoC: dt-bindings: ak4458: Add power supply property

[Shengjiu Wang]

AVDD-supply is for Analog power supply
DVDD-supply is for Digital power supply

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 Documentation/devicetree/bindings/sound/ak4458.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/ak4458.txt b/Documentation/devicetree/bindings/sound/ak4458.txt
index e5820235e0d5..8f6c84f21468 100644
--- a/Documentation/devicetree/bindings/sound/ak4458.txt
+++ b/Documentation/devicetree/bindings/sound/ak4458.txt
@@ -10,6 +10,8 @@ Required properties:
 Optional properties:
 - reset-gpios: A GPIO specifier for the power down & reset pin
 - mute-gpios: A GPIO specifier for the soft mute pin
+- AVDD-supply: Analog power supply
+- DVDD-supply: Digital power supply
 
 Example:
 
-- 
2.27.0

[PATCH 2/2] ASoC: ak4458: Add regulator support

[Shengjiu Wang]

"AVDD" is for analog power supply,  "DVDD" is for digital power
supply, they can improve the power management.

As the regulator is enabled in pm runtime resume, which is
behind the component driver probe, so accessing registers in
component driver probe will fail. Fix this issue by enabling
regcache_cache_only after pm_runtime_enable.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 sound/soc/codecs/ak4458.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/ak4458.c b/sound/soc/codecs/ak4458.c
index cbe3c782e0ca..763e6839428f 100644
--- a/sound/soc/codecs/ak4458.c
+++ b/sound/soc/codecs/ak4458.c
@@ -12,6 +12,7 @@
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <sound/initval.h>
 #include <sound/pcm_params.h>
@@ -21,6 +22,12 @@
 
 #include "ak4458.h"
 
+#define AK4458_NUM_SUPPLIES 2
+static const char *ak4458_supply_names[AK4458_NUM_SUPPLIES] = {
+	"DVDD",
+	"AVDD",
+};
+
 struct ak4458_drvdata {
 	struct snd_soc_dai_driver *dai_drv;
 	const struct snd_soc_component_driver *comp_drv;
@@ -28,6 +35,7 @@ struct ak4458_drvdata {
 
 /* AK4458 Codec Private Data */
 struct ak4458_priv {
+	struct regulator_bulk_data supplies[AK4458_NUM_SUPPLIES];
 	struct device *dev;
 	struct regmap *regmap;
 	struct gpio_desc *reset_gpiod;
@@ -587,12 +595,22 @@ static int __maybe_unused ak4458_runtime_suspend(struct device *dev)
 	if (ak4458->mute_gpiod)
 		gpiod_set_value_cansleep(ak4458->mute_gpiod, 0);
 
+	regulator_bulk_disable(ARRAY_SIZE(ak4458->supplies),
+			       ak4458->supplies);
 	return 0;
 }
 
 static int __maybe_unused ak4458_runtime_resume(struct device *dev)
 {
 	struct ak4458_priv *ak4458 = dev_get_drvdata(dev);
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ak4458->supplies),
+				    ak4458->supplies);
+	if (ret != 0) {
+		dev_err(ak4458->dev, "Failed to enable supplies: %d\n", ret);
+		return ret;
+	}
 
 	if (ak4458->mute_gpiod)
 		gpiod_set_value_cansleep(ak4458->mute_gpiod, 1);
@@ -667,7 +685,7 @@ static int ak4458_i2c_probe(struct i2c_client *i2c)
 {
 	struct ak4458_priv *ak4458;
 	const struct ak4458_drvdata *drvdata;
-	int ret;
+	int ret, i;
 
 	ak4458 = devm_kzalloc(&i2c->dev, sizeof(*ak4458), GFP_KERNEL);
 	if (!ak4458)
@@ -692,6 +710,16 @@ static int ak4458_i2c_probe(struct i2c_client *i2c)
 	if (IS_ERR(ak4458->mute_gpiod))
 		return PTR_ERR(ak4458->mute_gpiod);
 
+	for (i = 0; i < ARRAY_SIZE(ak4458->supplies); i++)
+		ak4458->supplies[i].supply = ak4458_supply_names[i];
+
+	ret = devm_regulator_bulk_get(ak4458->dev, ARRAY_SIZE(ak4458->supplies),
+				      ak4458->supplies);
+	if (ret != 0) {
+		dev_err(ak4458->dev, "Failed to request supplies: %d\n", ret);
+		return ret;
+	}
+
 	ret = devm_snd_soc_register_component(ak4458->dev, drvdata->comp_drv,
 					      drvdata->dai_drv, 1);
 	if (ret < 0) {
@@ -700,6 +728,7 @@ static int ak4458_i2c_probe(struct i2c_client *i2c)
 	}
 
 	pm_runtime_enable(&i2c->dev);
+	regcache_cache_only(ak4458->regmap, true);
 
 	return 0;
 }
-- 
2.27.0

Re: [PATCH 1/2] ASoC: dt-bindings: ak4458: Add power supply property

[Mark Brown]

On Fri, 14 Aug 2020 17:32:40 +0800, Shengjiu Wang wrote:
> AVDD-supply is for Analog power supply
> DVDD-supply is for Digital power supply

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/2] ASoC: dt-bindings: ak4458: Add power supply property
      commit: 617a156f2ebae841bcd64ee5a21d0e12b5d733ab
[2/2] ASoC: ak4458: Add regulator support
      commit: 7e3096e8f823682c20e033113ec32dd590364774

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark