ASoC: codecs: Add support for PCM1789

Add Texas Instruments's PCM1789 DAC support.
It is a simple DAC and does not have many registers.

One particularity about this DAC is that the clocks must be
always enabled. Also, an entire software reset is necessary
while starting to play a sound otherwise, the clocks are not
synchronized (so the DAC is not able to send data).

Signed-off-by: Mylène Josserand <mylene.josserand@bootlin.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 62 insertions, 0 deletions

diff --git a/sound/soc/codecs/pcm1789-i2c.c b/sound/soc/codecs/pcm1789-i2c.c
new file mode 100644
index 000000000000..327ec584f240
--- /dev/null
+++ b/sound/soc/codecs/pcm1789-i2c.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+// Audio driver for PCM1789 I2C
+// Copyright (C) 2018 Bootlin
+// Mylène Josserand <mylene.josserand@bootlin.com>
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+#include "pcm1789.h"
+
+static int pcm1789_i2c_probe(struct i2c_client *client,
+			     const struct i2c_device_id *id)
+{
+	struct regmap *regmap;
+	int ret;
+
+	regmap = devm_regmap_init_i2c(client, &pcm1789_regmap_config);
+	if (IS_ERR(regmap)) {
+		ret = PTR_ERR(regmap);
+		dev_err(&client->dev, "Failed to allocate regmap: %d\n", ret);
+		return ret;
+	}
+
+	return pcm1789_common_init(&client->dev, regmap);
+}
+
+static int pcm1789_i2c_remove(struct i2c_client *client)
+{
+	return pcm1789_common_exit(&client->dev);
+}
+
+static const struct of_device_id pcm1789_of_match[] = {
+	{ .compatible = "ti,pcm1789", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, pcm1789_of_match);
+
+static const struct i2c_device_id pcm1789_i2c_ids[] = {
+	{ "pcm1789", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, pcm1789_i2c_ids);
+
+static struct i2c_driver pcm1789_i2c_driver = {
+	.driver = {
+		.name	= "pcm1789",
+		.of_match_table = of_match_ptr(pcm1789_of_match),
+	},
+	.id_table	= pcm1789_i2c_ids,
+	.probe		= pcm1789_i2c_probe,
+	.remove	= pcm1789_i2c_remove,
+};
+
+module_i2c_driver(pcm1789_i2c_driver);
+
+MODULE_DESCRIPTION("ASoC PCM1789 I2C driver");
+MODULE_AUTHOR("Mylène Josserand <mylene.josserand@bootlin.com>");
+MODULE_LICENSE("GPL");