ASoC: max98373: Convert to use GPIO descriptors

Instead of relying on legacy interfaces, convert the driver to
use GPIO descriptors. This is a straight-forward conversion,
we support also sdw devices providing GPIO descriptor tables
if they so desire.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230825-descriptors-asoc-max-v1-3-b212292b2f08@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max98373-i2c.c

@@ -3,12 +3,10 @@
 
 #include <linux/acpi.h>
 #include <linux/delay.h>
-#include <linux/gpio.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/pm.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
@@ -560,21 +558,6 @@ static int max98373_i2c_probe(struct i2c_client *i2c)
 	/* voltage/current slot & gpio configuration */
 	max98373_slot_config(&i2c->dev, max98373);
 
-	/* Power on device */
-	if (gpio_is_valid(max98373->reset_gpio)) {
-		ret = devm_gpio_request(&i2c->dev, max98373->reset_gpio,
-					"MAX98373_RESET");
-		if (ret) {
-			dev_err(&i2c->dev, "%s: Failed to request gpio %d\n",
-				__func__, max98373->reset_gpio);
-			return -EINVAL;
-		}
-		gpio_direction_output(max98373->reset_gpio, 0);
-		msleep(50);
-		gpio_direction_output(max98373->reset_gpio, 1);
-		msleep(20);
-	}
-
 	/* Check Revision ID */
 	ret = regmap_read(max98373->regmap,
 			  MAX98373_R21FF_REV_ID, &reg);

sound/soc/codecs/max98373.c

@@ -12,9 +12,8 @@
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <sound/tlv.h>
 #include "max98373.h"
 
@@ -478,20 +477,24 @@ void max98373_slot_config(struct device *dev,
 		max98373->i_slot = value & 0xF;
 	else
 		max98373->i_slot = 1;
-	if (dev->of_node) {
-		max98373->reset_gpio = of_get_named_gpio(dev->of_node,
-						"maxim,reset-gpio", 0);
-		if (!gpio_is_valid(max98373->reset_gpio)) {
-			dev_err(dev, "Looking up %s property in node %s failed %d\n",
-				"maxim,reset-gpio", dev->of_node->full_name,
-				max98373->reset_gpio);
-		} else {
-			dev_dbg(dev, "maxim,reset-gpio=%d",
-				max98373->reset_gpio);
-		}
-	} else {
-		/* this makes reset_gpio as invalid */
-		max98373->reset_gpio = -1;
+
+	/* This will assert RESET */
+	max98373->reset = devm_gpiod_get_optional(dev,
+						  "maxim,reset",
+						  GPIOD_OUT_HIGH);
+	if (IS_ERR(max98373->reset)) {
+		dev_err(dev, "error %ld looking up RESET GPIO line\n",
+			PTR_ERR(max98373->reset));
+		return;
+	}
+
+	/* Cycle reset */
+	if (max98373->reset) {
+		gpiod_set_consumer_name(max98373->reset ,"MAX98373_RESET");
+		gpiod_direction_output(max98373->reset, 1);
+		msleep(50);
+		gpiod_direction_output(max98373->reset, 0);
+		msleep(20);
 	}
 
 	if (!device_property_read_u32(dev, "maxim,spkfb-slot-no", &value))

sound/soc/codecs/max98373.h

@@ -213,7 +213,7 @@ struct max98373_cache {
 
 struct max98373_priv {
 	struct regmap *regmap;
-	int reset_gpio;
+	struct gpio_desc *reset;
 	unsigned int v_slot;
 	unsigned int i_slot;
 	unsigned int spkfb_slot;