[PATCH] ASoC: ak4458: add optional reset control to instead of gpio

[PATCH] ASoC: ak4458: add optional reset control to instead of gpio

[Shengjiu Wang]

From: Viorel Suman <viorel.suman@nxp.com>

Add optional reset control instead of GPIO to manage codec
PDN pin.

As there is reference counter for reset control, so need
to remove one ak4458_reset in runtime resume to make the
reference counter balance.

Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 sound/soc/codecs/ak4458.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/ak4458.c b/sound/soc/codecs/ak4458.c
index 626310859814..ac328d598291 100644
--- a/sound/soc/codecs/ak4458.c
+++ b/sound/soc/codecs/ak4458.c
@@ -13,6 +13,7 @@
 #include <linux/of_gpio.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
+#include <linux/reset.h>
 #include <linux/slab.h>
 #include <sound/initval.h>
 #include <sound/pcm_params.h>
@@ -46,6 +47,7 @@ struct ak4458_priv {
 	struct device *dev;
 	struct regmap *regmap;
 	struct gpio_desc *reset_gpiod;
+	struct reset_control *reset;
 	struct gpio_desc *mute_gpiod;
 	int digfil;	/* SSLOW, SD, SLOW bits */
 	int fs;		/* sampling rate */
@@ -633,6 +635,12 @@ static void ak4458_reset(struct ak4458_priv *ak4458, bool active)
 	if (ak4458->reset_gpiod) {
 		gpiod_set_value_cansleep(ak4458->reset_gpiod, active);
 		usleep_range(1000, 2000);
+	} else if (!IS_ERR_OR_NULL(ak4458->reset)) {
+		if (active)
+			reset_control_assert(ak4458->reset);
+		else
+			reset_control_deassert(ak4458->reset);
+		usleep_range(1000, 2000);
 	}
 }
 
@@ -668,7 +676,6 @@ static int __maybe_unused ak4458_runtime_resume(struct device *dev)
 	if (ak4458->mute_gpiod)
 		gpiod_set_value_cansleep(ak4458->mute_gpiod, 1);
 
-	ak4458_reset(ak4458, true);
 	ak4458_reset(ak4458, false);
 
 	regcache_cache_only(ak4458->regmap, false);
@@ -748,6 +755,10 @@ static int ak4458_i2c_probe(struct i2c_client *i2c)
 
 	ak4458->drvdata = of_device_get_match_data(&i2c->dev);
 
+	ak4458->reset = devm_reset_control_get_optional_shared(ak4458->dev, NULL);
+	if (IS_ERR(ak4458->reset))
+		return PTR_ERR(ak4458->reset);
+
 	ak4458->reset_gpiod = devm_gpiod_get_optional(ak4458->dev, "reset",
 						      GPIOD_OUT_LOW);
 	if (IS_ERR(ak4458->reset_gpiod))
-- 
2.34.1

Re: [PATCH] ASoC: ak4458: add optional reset control to instead of gpio

[Mark Brown]

On Thu, 13 Oct 2022 20:36:51 +0800, Shengjiu Wang wrote:
> From: Viorel Suman <viorel.suman@nxp.com>
> 
> Add optional reset control instead of GPIO to manage codec
> PDN pin.
> 
> As there is reference counter for reset control, so need
> to remove one ak4458_reset in runtime resume to make the
> reference counter balance.
> 
> [...]

Applied to

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

Thanks!

[1/1] ASoC: ak4458: add optional reset control to instead of gpio
      commit: 8a0de73cf9dc044d65ad40112fd00025e225bc83

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