ASoC: cs4271: Convert to GPIO descriptors

This converts the Cirrus CS4271 ASoC codec driver to use
GPIO descriptors.

It turns out that there are two in-kernel users of the platform
data passing mechanism so these are switched over as well.

One locally defined GPIO "gpio_disabled" is declared in the
state struct but completely unused in the driver, so we delete
it.
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20231201-descriptors-sound-cirrus-v2-6-ee9f9d4655eb@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

arch/arm/mach-ep93xx/edb93xx.c

@@ -88,7 +88,7 @@ static void __init edb93xx_register_i2c(void)
  * EDB93xx SPI peripheral handling
  *************************************************************************/
 static struct cs4271_platform_data edb93xx_cs4271_data = {
-	.gpio_nreset	= -EINVAL,	/* filled in later */
+	/* Intentionally left blank */
 };
 
 static struct spi_board_info edb93xx_spi_board_info[] __initdata = {
@@ -114,14 +114,38 @@ static struct ep93xx_spi_info edb93xx_spi_info __initdata = {
 	/* Intentionally left blank */
 };
 
+static struct gpiod_lookup_table edb93xx_cs4272_edb9301_gpio_table = {
+	.dev_id = "spi0.0", /* CS0 on SPI0 */
+	.table = {
+		GPIO_LOOKUP("A", 1, "reset", GPIO_ACTIVE_LOW),
+		{ },
+	},
+};
+
+static struct gpiod_lookup_table edb93xx_cs4272_edb9302_gpio_table = {
+	.dev_id = "spi0.0", /* CS0 on SPI0 */
+	.table = {
+		GPIO_LOOKUP("H", 2, "reset", GPIO_ACTIVE_LOW),
+		{ },
+	},
+};
+
+static struct gpiod_lookup_table edb93xx_cs4272_edb9315_gpio_table = {
+	.dev_id = "spi0.0", /* CS0 on SPI0 */
+	.table = {
+		GPIO_LOOKUP("B", 6, "reset", GPIO_ACTIVE_LOW),
+		{ },
+	},
+};
+
 static void __init edb93xx_register_spi(void)
 {
 	if (machine_is_edb9301() || machine_is_edb9302())
-		edb93xx_cs4271_data.gpio_nreset = EP93XX_GPIO_LINE_EGPIO1;
+		gpiod_add_lookup_table(&edb93xx_cs4272_edb9301_gpio_table);
 	else if (machine_is_edb9302a() || machine_is_edb9307a())
-		edb93xx_cs4271_data.gpio_nreset = EP93XX_GPIO_LINE_H(2);
+		gpiod_add_lookup_table(&edb93xx_cs4272_edb9302_gpio_table);
 	else if (machine_is_edb9315a())
-		edb93xx_cs4271_data.gpio_nreset = EP93XX_GPIO_LINE_EGPIO14;
+		gpiod_add_lookup_table(&edb93xx_cs4272_edb9315_gpio_table);
 
 	gpiod_add_lookup_table(&edb93xx_spi_cs_gpio_table);
 	ep93xx_register_spi(&edb93xx_spi_info, edb93xx_spi_board_info,

arch/arm/mach-ep93xx/vision_ep9307.c

@@ -164,7 +164,7 @@ static struct i2c_board_info vision_i2c_info[] __initdata = {
  * SPI CS4271 Audio Codec
  *************************************************************************/
 static struct cs4271_platform_data vision_cs4271_data = {
-	.gpio_nreset	= EP93XX_GPIO_LINE_H(2),
+	/* Intentionally left blank */
 };
 
 /*************************************************************************
@@ -241,6 +241,15 @@ static struct spi_board_info vision_spi_board_info[] __initdata = {
 	},
 };
 
+static struct gpiod_lookup_table vision_spi_cs4271_gpio_table = {
+	.dev_id = "spi0.0", /* cs4271 @ CS0 */
+	.table = {
+		/* RESET */
+		GPIO_LOOKUP_IDX("H", 2, NULL, 0, GPIO_ACTIVE_LOW),
+		{ },
+	},
+};
+
 static struct gpiod_lookup_table vision_spi_cs_gpio_table = {
 	.dev_id = "spi0",
 	.table = {
@@ -292,6 +301,7 @@ static void __init vision_init_machine(void)
 
 	ep93xx_register_i2c(vision_i2c_info,
 				ARRAY_SIZE(vision_i2c_info));
+	gpiod_add_lookup_table(&vision_spi_cs4271_gpio_table);
 	gpiod_add_lookup_table(&vision_spi_mmc_gpio_table);
 	gpiod_add_lookup_table(&vision_spi_cs_gpio_table);
 	ep93xx_register_spi(&vision_spi_master, vision_spi_board_info,

include/sound/cs4271.h

@@ -9,7 +9,6 @@
 #define __CS4271_H
 
 struct cs4271_platform_data {
-	int gpio_nreset;	/* GPIO driving Reset pin, if any */
 	bool amutec_eq_bmutec;	/* flag to enable AMUTEC=BMUTEC */
 
 	/*

sound/soc/codecs/cs4271.c

@@ -13,9 +13,8 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/regulator/consumer.h>
 #include <sound/pcm.h>
 #include <sound/soc.h>
@@ -160,9 +159,7 @@ struct cs4271_private {
 	/* Current sample rate for de-emphasis control */
 	int				rate;
 	/* GPIO driving Reset pin, if any */
-	int				gpio_nreset;
-	/* GPIO that disable serial bus, if any */
-	int				gpio_disable;
+	struct gpio_desc		*reset;
 	/* enable soft reset workaround */
 	bool				enable_soft_reset;
 	struct regulator_bulk_data      supplies[ARRAY_SIZE(supply_names)];
@@ -487,12 +484,10 @@ static int cs4271_reset(struct snd_soc_component *component)
 {
 	struct cs4271_private *cs4271 = snd_soc_component_get_drvdata(component);
 
-	if (gpio_is_valid(cs4271->gpio_nreset)) {
-		gpio_direction_output(cs4271->gpio_nreset, 0);
-		mdelay(1);
-		gpio_set_value(cs4271->gpio_nreset, 1);
-		mdelay(1);
-	}
+	gpiod_direction_output(cs4271->reset, 1);
+	mdelay(1);
+	gpiod_set_value(cs4271->reset, 0);
+	mdelay(1);
 
 	return 0;
 }
@@ -612,9 +607,8 @@ static void cs4271_component_remove(struct snd_soc_component *component)
 {
 	struct cs4271_private *cs4271 = snd_soc_component_get_drvdata(component);
 
-	if (gpio_is_valid(cs4271->gpio_nreset))
-		/* Set codec to the reset state */
-		gpio_set_value(cs4271->gpio_nreset, 0);
+	/* Set codec to the reset state */
+	gpiod_set_value(cs4271->reset, 1);
 
 	regcache_mark_dirty(cs4271->regmap);
 	regulator_bulk_disable(ARRAY_SIZE(cs4271->supplies), cs4271->supplies);
@@ -639,7 +633,6 @@ static const struct snd_soc_component_driver soc_component_dev_cs4271 = {
 static int cs4271_common_probe(struct device *dev,
 			       struct cs4271_private **c)
 {
-	struct cs4271_platform_data *cs4271plat = dev->platform_data;
 	struct cs4271_private *cs4271;
 	int i, ret;
 
@@ -647,17 +640,11 @@ static int cs4271_common_probe(struct device *dev,
 	if (!cs4271)
 		return -ENOMEM;
 
-	cs4271->gpio_nreset = of_get_named_gpio(dev->of_node, "reset-gpio", 0);
-
-	if (cs4271plat)
-		cs4271->gpio_nreset = cs4271plat->gpio_nreset;
-
-	if (gpio_is_valid(cs4271->gpio_nreset)) {
-		ret = devm_gpio_request(dev, cs4271->gpio_nreset,
-					"CS4271 Reset");
-		if (ret < 0)
-			return ret;
-	}
+	cs4271->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_ASIS);
+	if (IS_ERR(cs4271->reset))
+		return dev_err_probe(dev, PTR_ERR(cs4271->reset),
+				     "error retrieveing RESET GPIO\n");
+	gpiod_set_consumer_name(cs4271->reset, "CS4271 Reset");
 
 	for (i = 0; i < ARRAY_SIZE(supply_names); i++)
 		cs4271->supplies[i].supply = supply_names[i];