ASoC: ak4458: add optional reset control to instead of gpio

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 <[e-mail]>
Signed-off-by: Shengjiu Wang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/ak4458.c

···
 #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>
···
 	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 */
···
 	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);
 	}
 }
 
···
 	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);
···
 	ak4458->dev = &i2c->dev;
 
 	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);