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>

1 files changed, 58 insertions, 0 deletions

diff --git a/sound/soc/codecs/adau1372-spi.c b/sound/soc/codecs/adau1372-spi.c
new file mode 100644
index 000000000000..51298e00fbd6
--- /dev/null
+++ b/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");