ASoC: Add ADAU1372 audio CODEC support

Add support for the Analog Devices ADAU1372 audio CODEC.

[Alexandre Belloni: allow 32kHz for TDM4 in slave mode]

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20201127123030.1610574-2-alexandre.belloni@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -23,6 +23,8 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_AD193X_I2C
 	imply SND_SOC_AD1980
 	imply SND_SOC_AD73311
+	imply SND_SOC_ADAU1372_I2C
+	imply SND_SOC_ADAU1372_SPI
 	imply SND_SOC_ADAU1373
 	imply SND_SOC_ADAU1761_I2C
 	imply SND_SOC_ADAU1761_SPI
@@ -364,6 +366,20 @@ config SND_SOC_AD73311
 config SND_SOC_ADAU_UTILS
 	tristate
 
+config SND_SOC_ADAU1372
+	tristate
+	select SND_SOC_ADAU_UTILS
+
+config SND_SOC_ADAU1372_I2C
+	tristate "Analog Devices ADAU1372 CODEC (I2C)"
+	select SND_SOC_ADAU1372
+	select REGMAP_I2C
+
+config SND_SOC_ADAU1372_SPI
+	tristate "Analog Devices ADAU1372 CODEC (SPI)"
+	select SND_SOC_ADAU1372
+	select REGMAP_SPI
+
 config SND_SOC_ADAU1373
 	tristate
 	depends on I2C

sound/soc/codecs/Makefile

@@ -9,6 +9,9 @@ snd-soc-ad193x-i2c-objs := ad193x-i2c.o
 snd-soc-ad1980-objs := ad1980.o
 snd-soc-ad73311-objs := ad73311.o
 snd-soc-adau-utils-objs := adau-utils.o
+snd-soc-adau1372-objs := adau1372.o
+snd-soc-adau1372-i2c-objs := adau1372-i2c.o
+snd-soc-adau1372-spi-objs := adau1372-spi.o
 snd-soc-adau1373-objs := adau1373.o
 snd-soc-adau1701-objs := adau1701.o
 snd-soc-adau17x1-objs := adau17x1.o
@@ -319,6 +322,9 @@ obj-$(CONFIG_SND_SOC_AD193X_I2C)	+= snd-soc-ad193x-i2c.o
 obj-$(CONFIG_SND_SOC_AD1980)	+= snd-soc-ad1980.o
 obj-$(CONFIG_SND_SOC_AD73311) += snd-soc-ad73311.o
 obj-$(CONFIG_SND_SOC_ADAU_UTILS)	+= snd-soc-adau-utils.o
+obj-$(CONFIG_SND_SOC_ADAU1372)	+= snd-soc-adau1372.o
+obj-$(CONFIG_SND_SOC_ADAU1372_I2C)	+= snd-soc-adau1372-i2c.o
+obj-$(CONFIG_SND_SOC_ADAU1372_SPI)	+= snd-soc-adau1372-spi.o
 obj-$(CONFIG_SND_SOC_ADAU1373)	+= snd-soc-adau1373.o
 obj-$(CONFIG_SND_SOC_ADAU1701)		+= snd-soc-adau1701.o
 obj-$(CONFIG_SND_SOC_ADAU17X1)		+= snd-soc-adau17x1.o

sound/soc/codecs/adau1372-i2c.c

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for ADAU1372 codec
+ *
+ * Copyright 2016 Analog Devices Inc.
+ *  Author: Lars-Peter Clausen <lars@metafoo.de>
+ */
+
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <sound/soc.h>
+
+#include "adau1372.h"
+
+static int adau1372_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	return adau1372_probe(&client->dev,
+		devm_regmap_init_i2c(client, &adau1372_regmap_config), NULL);
+}
+
+static const struct i2c_device_id adau1372_i2c_ids[] = {
+	{ "adau1372", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, adau1372_i2c_ids);
+
+static struct i2c_driver adau1372_i2c_driver = {
+	.driver = {
+		.name = "adau1372",
+	},
+	.probe = adau1372_i2c_probe,
+	.id_table = adau1372_i2c_ids,
+};
+module_i2c_driver(adau1372_i2c_driver);
+
+MODULE_DESCRIPTION("ASoC ADAU1372 CODEC I2C driver");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_LICENSE("GPL v2");

sound/soc/codecs/adau1372-spi.c

@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for ADAU1372 codec
+ *
+ * Copyright 2016 Analog Devices Inc.
+ *  Author: Lars-Peter Clausen <lars@metafoo.de>
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <sound/soc.h>
+
+#include "adau1372.h"
+
+static void adau1372_spi_switch_mode(struct device *dev)
+{
+	struct spi_device *spi = to_spi_device(dev);
+
+	/*
+	 * To get the device into SPI mode CLATCH has to be pulled low three
+	 * times.  Do this by issuing three dummy reads.
+	 */
+	spi_w8r8(spi, 0x00);
+	spi_w8r8(spi, 0x00);
+	spi_w8r8(spi, 0x00);
+}
+
+static int adau1372_spi_probe(struct spi_device *spi)
+{
+	struct regmap_config config;
+
+	config = adau1372_regmap_config;
+	config.read_flag_mask = 0x1;
+
+	return adau1372_probe(&spi->dev,
+		devm_regmap_init_spi(spi, &config), adau1372_spi_switch_mode);
+}
+
+static const struct spi_device_id adau1372_spi_id[] = {
+	{ "adau1372", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, adau1372_spi_id);
+
+static struct spi_driver adau1372_spi_driver = {
+	.driver = {
+		.name = "adau1372",
+	},
+	.probe = adau1372_spi_probe,
+	.id_table = adau1372_spi_id,
+};
+module_spi_driver(adau1372_spi_driver);
+
+MODULE_DESCRIPTION("ASoC ADAU1372 CODEC SPI driver");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_LICENSE("GPL v2");

sound/soc/codecs/adau1372.h

@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * ADAU1372 driver
+ *
+ * Copyright 2016 Analog Devices Inc.
+ *  Author: Lars-Peter Clausen <lars@metafoo.de>
+ */
+
+#ifndef SOUND_SOC_CODECS_ADAU1372_H
+#define SOUND_SOC_CODECS_ADAU1372_H
+
+#include <linux/regmap.h>
+
+struct device;
+
+int adau1372_probe(struct device *dev, struct regmap *regmap,
+		   void (*switch_mode)(struct device *dev));
+
+extern const struct regmap_config adau1372_regmap_config;
+
+#endif