ASoC: cs530x: Add SPI bus support for cs530x parts

Cirrus Logic cs530x device family has 2 control buses I2C and SPI.
This patch adds SPI support.

Signed-off-by: Vitaly Rodionov <vitalyr@opensource.cirrus.com>
Link: https://patch.msgid.link/20251023090327.58275-13-vitalyr@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -106,6 +106,7 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_CS48L32
 	imply SND_SOC_CS53L30
 	imply SND_SOC_CS530X_I2C
+	imply SND_SOC_CS530X_SPI
 	imply SND_SOC_CX20442
 	imply SND_SOC_CX2072X
 	imply SND_SOC_DA7210
@@ -1082,6 +1083,15 @@ config SND_SOC_CS530X_I2C
 	  Enable support for Cirrus Logic CS530X ADCs
 	  with I2C control.
 
+config SND_SOC_CS530X_SPI
+	tristate "Cirrus Logic CS530x ADCs (SPI)"
+	depends on SPI_MASTER
+	select REGMAP_SPI
+	select SND_SOC_CS530X
+	help
+	  Enable support for Cirrus Logic CS530X ADCs
+	  with SPI control.
+
 config SND_SOC_CX20442
 	tristate
 	depends on TTY

sound/soc/codecs/Makefile

@@ -115,6 +115,7 @@ snd-soc-cs48l32-y := cs48l32.o cs48l32-tables.o
 snd-soc-cs53l30-y := cs53l30.o
 snd-soc-cs530x-y := cs530x.o
 snd-soc-cs530x-i2c-y := cs530x-i2c.o
+snd-soc-cs530x-spi-y := cs530x-spi.o
 snd-soc-cx20442-y := cx20442.o
 snd-soc-cx2072x-y := cx2072x.o
 snd-soc-da7210-y := da7210.o
@@ -546,6 +547,7 @@ obj-$(CONFIG_SND_SOC_CS48L32)	+= snd-soc-cs48l32.o
 obj-$(CONFIG_SND_SOC_CS53L30)	+= snd-soc-cs53l30.o
 obj-$(CONFIG_SND_SOC_CS530X)	+= snd-soc-cs530x.o
 obj-$(CONFIG_SND_SOC_CS530X_I2C)	+= snd-soc-cs530x-i2c.o
+obj-$(CONFIG_SND_SOC_CS530X_SPI)	+= snd-soc-cs530x-spi.o
 obj-$(CONFIG_SND_SOC_CX20442)	+= snd-soc-cx20442.o
 obj-$(CONFIG_SND_SOC_CX2072X)	+= snd-soc-cx2072x.o
 obj-$(CONFIG_SND_SOC_DA7210)	+= snd-soc-da7210.o

sound/soc/codecs/cs530x-spi.c

@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// CS530x CODEC driver
+//
+// Copyright (C) 2025 Cirrus Logic, Inc. and
+//                    Cirrus Logic International Semiconductor Ltd.
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+
+#include "cs530x.h"
+
+static const struct of_device_id cs530x_of_match[] = {
+	{
+		.compatible = "cirrus,cs4282",
+		.data = (void *)CS4282,
+	}, {
+		.compatible = "cirrus,cs4302",
+		.data = (void *)CS4302,
+	}, {
+		.compatible = "cirrus,cs4304",
+		.data = (void *)CS4304,
+	}, {
+		.compatible = "cirrus,cs4308",
+		.data = (void *)CS4308,
+	}, {
+		.compatible = "cirrus,cs5302",
+		.data = (void *)CS5302,
+	}, {
+		.compatible = "cirrus,cs5304",
+		.data = (void *)CS5304,
+	}, {
+		.compatible = "cirrus,cs5304",
+		.data = (void *)CS5308,
+	},
+	{}
+};
+MODULE_DEVICE_TABLE(of, cs530x_of_match);
+
+static const struct spi_device_id cs530x_spi_id[] = {
+	{ "cs4282", CS4282 },
+	{ "cs4302", CS4302 },
+	{ "cs4304", CS4304 },
+	{ "cs4308", CS4308 },
+	{ "cs5302", CS5302 },
+	{ "cs5304", CS5304 },
+	{ "cs5308", CS5308 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, cs530x_spi_id);
+
+static int cs530x_spi_probe(struct spi_device *spi)
+{
+	struct cs530x_priv *cs530x;
+	struct device *dev = &spi->dev;
+	int ret;
+
+	cs530x = devm_kzalloc(dev, sizeof(struct cs530x_priv), GFP_KERNEL);
+	if (cs530x == NULL)
+		return -ENOMEM;
+
+	spi_set_drvdata(spi, cs530x);
+
+	cs530x->regmap = devm_regmap_init_spi(spi, &cs530x_regmap_spi);
+	if (IS_ERR(cs530x->regmap)) {
+		ret = PTR_ERR(cs530x->regmap);
+		dev_err(dev, "Failed to allocate register map: %d\n", ret);
+		return ret;
+	}
+
+	cs530x->devtype = (unsigned long)spi_get_device_match_data(spi);
+	cs530x->dev = &spi->dev;
+
+	return cs530x_probe(cs530x);
+}
+
+static struct spi_driver cs530x_spi_driver = {
+	.driver = {
+		.name		= "cs530x",
+		.of_match_table = cs530x_of_match,
+	},
+	.id_table	= cs530x_spi_id,
+	.probe		= cs530x_spi_probe,
+};
+
+module_spi_driver(cs530x_spi_driver);
+
+MODULE_DESCRIPTION("SPI CS530X driver");
+MODULE_IMPORT_NS("SND_SOC_CS530X");
+MODULE_AUTHOR("Vitaly Rodionov <vitalyr@opensource.cirrus.com>");
+MODULE_LICENSE("GPL");

sound/soc/codecs/cs530x.c

@@ -12,6 +12,7 @@
 #include <linux/pm.h>
 #include <linux/property.h>
 #include <linux/slab.h>
+#include <linux/spi/spi.h>
 #include <sound/core.h>
 #include <sound/initval.h>
 #include <sound/pcm.h>
@@ -1142,6 +1143,26 @@ const struct regmap_config cs530x_regmap_i2c = {
 };
 EXPORT_SYMBOL_NS_GPL(cs530x_regmap_i2c, "SND_SOC_CS530X");
 
+const struct regmap_config cs530x_regmap_spi = {
+	.reg_bits = 16,
+	.pad_bits = 16,
+	.val_bits = 16,
+
+	.reg_stride = 2,
+
+	.reg_format_endian = REGMAP_ENDIAN_BIG,
+	.val_format_endian = REGMAP_ENDIAN_BIG,
+
+	.max_register = CS530X_MAX_REGISTER,
+	.writeable_reg = cs530x_writeable_register,
+	.readable_reg = cs530x_readable_register,
+
+	.cache_type = REGCACHE_MAPLE,
+	.reg_defaults = cs530x_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(cs530x_reg_defaults),
+};
+EXPORT_SYMBOL_NS_GPL(cs530x_regmap_spi, "SND_SOC_CS530X");
+
 static int cs530x_check_device_id(struct cs530x_priv *cs530x)
 {
 	struct device *dev = cs530x->dev;

sound/soc/codecs/cs530x.h

@@ -247,6 +247,7 @@ struct cs530x_priv {
 };
 
 extern const struct regmap_config cs530x_regmap_i2c;
+extern const struct regmap_config cs530x_regmap_spi;
 int cs530x_probe(struct cs530x_priv *cs530x);
 
 #endif