drivers: dac: add driver for AD5592

Add MFD subdriver for the built-in DAC controller
in AD5592 chip.

Signed-off-by: Bartosz Bilas <b.bilas@grinn-global.com>

CODEOWNERS

@@ -275,6 +275,7 @@
 /drivers/display/display_ili9342c.*       @extremegtx
 /drivers/dac/                             @martinjaeger
 /drivers/dac/*ad56xx*                     @benediktibk
+/drivers/dac/dac_ad5592.c                 @bbilas
 /drivers/dai/                             @kv2019i @marcinszkudlinski @abonislawski
 /drivers/dai/intel/                       @kv2019i @marcinszkudlinski @abonislawski
 /drivers/dai/intel/ssp/                   @kv2019i @marcinszkudlinski @abonislawski

drivers/dac/CMakeLists.txt

@@ -18,5 +18,6 @@ zephyr_library_sources_ifdef(CONFIG_DAC_MCP4725		dac_mcp4725.c)
 zephyr_library_sources_ifdef(CONFIG_DAC_MCP4728		dac_mcp4728.c)
 zephyr_library_sources_ifdef(CONFIG_DAC_GD32		dac_gd32.c)
 zephyr_library_sources_ifdef(CONFIG_DAC_ESP32		dac_esp32.c)
+zephyr_library_sources_ifdef(CONFIG_DAC_AD5592		dac_ad5592.c)
 zephyr_library_sources_ifdef(CONFIG_DAC_AD56XX		dac_ad56xx.c)
 zephyr_library_sources_ifdef(CONFIG_USERSPACE		dac_handlers.c)

drivers/dac/Kconfig

@@ -54,4 +54,6 @@ source "drivers/dac/Kconfig.esp32"
 
 source "drivers/dac/Kconfig.ad56xx"
 
+source "drivers/dac/Kconfig.ad5592"
+
 endif # DAC

drivers/dac/Kconfig.ad5592

@@ -0,0 +1,10 @@
+# Copyright (c) 2023 Grinn
+# SPDX -License-Identifier: Apache-2.0
+
+config DAC_AD5592
+	bool "AD5592 DAC driver"
+	default y
+	depends on DT_HAS_ADI_AD5592_DAC_ENABLED
+	select MFD
+	help
+	  Enable the AD5592 DAC driver.

drivers/dac/dac_ad5592.c

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2023 Grinn
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define DT_DRV_COMPAT adi_ad5592_dac
+
+#include <zephyr/drivers/dac.h>
+#include <zephyr/kernel.h>
+#include <zephyr/sys/byteorder.h>
+
+#include <zephyr/drivers/mfd/ad5592.h>
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_REGISTER(dac_ad5592, CONFIG_DAC_LOG_LEVEL);
+
+#define AD5592_DAC_RESOLUTION 12
+#define AD5592_DAC_WR_MSB_BIT BIT(15)
+#define AD5592_DAC_CHANNEL_SHIFT_VAL 12
+
+struct dac_ad5592_config {
+	const struct device *mfd_dev;
+};
+
+struct dac_ad5592_data {
+	uint8_t dac_conf;
+};
+
+static int dac_ad5592_channel_setup(const struct device *dev,
+				    const struct dac_channel_cfg *channel_cfg)
+{
+	const struct dac_ad5592_config *config = dev->config;
+	struct dac_ad5592_data *data = dev->data;
+
+	if (channel_cfg->channel_id >= AD5592_PIN_MAX) {
+		LOG_ERR("Invalid channel number %d", channel_cfg->channel_id);
+		return -EINVAL;
+	}
+
+	if (channel_cfg->resolution != AD5592_DAC_RESOLUTION) {
+		LOG_ERR("Invalid resolution %d", channel_cfg->resolution);
+		return -EINVAL;
+	}
+
+	data->dac_conf |= BIT(channel_cfg->channel_id);
+
+	return mfd_ad5592_write_reg(config->mfd_dev, AD5592_REG_LDAC_EN, data->dac_conf);
+}
+
+static int dac_ad5592_write_value(const struct device *dev, uint8_t channel,
+				  uint32_t value)
+{
+	const struct dac_ad5592_config *config = dev->config;
+	uint16_t msg;
+
+	if (channel >= AD5592_PIN_MAX) {
+		LOG_ERR("Invalid channel number %d", channel);
+		return -EINVAL;
+	}
+
+	if (value >= (1 << AD5592_DAC_RESOLUTION)) {
+		LOG_ERR("Value %d out of range", value);
+		return -EINVAL;
+	}
+
+	msg = sys_cpu_to_be16(AD5592_DAC_WR_MSB_BIT |
+			      channel << AD5592_DAC_CHANNEL_SHIFT_VAL |
+			      value);
+
+	return mfd_ad5592_write_raw(config->mfd_dev, msg);
+}
+
+static const struct dac_driver_api dac_ad5592_api = {
+	.channel_setup = dac_ad5592_channel_setup,
+	.write_value = dac_ad5592_write_value,
+};
+
+static int dac_ad5592_init(const struct device *dev)
+{
+	const struct dac_ad5592_config *config = dev->config;
+	int ret;
+
+	if (!device_is_ready(config->mfd_dev)) {
+		return -ENODEV;
+	}
+
+	ret = mfd_ad5592_write_reg(config->mfd_dev, AD5592_REG_PD_REF_CTRL, AD5592_EN_REF);
+	if (ret < 0) {
+		return ret;
+	}
+
+	return 0;
+}
+
+#define DAC_AD5592_DEFINE(inst)							\
+	static const struct dac_ad5592_config dac_ad5592_config##inst = {	\
+		.mfd_dev = DEVICE_DT_GET(DT_INST_PARENT(inst)),			\
+	};									\
+										\
+	struct dac_ad5592_data dac_ad5592_data##inst;				\
+										\
+	DEVICE_DT_INST_DEFINE(inst, dac_ad5592_init, NULL,			\
+			      &dac_ad5592_data##inst, &dac_ad5592_config##inst, \
+			      POST_KERNEL, CONFIG_MFD_INIT_PRIORITY,		\
+			      &dac_ad5592_api);
+
+DT_INST_FOREACH_STATUS_OKAY(DAC_AD5592_DEFINE)

dts/bindings/dac/adi,ad5592-dac.yaml

@@ -0,0 +1,15 @@
+# Copyright (c) 2023 Grinn
+# SPDX-License-Identifier: Apache-2.0
+
+description: AD5592 DAC Controller
+
+compatible: "adi,ad5592-dac"
+
+include: dac-controller.yaml
+
+properties:
+  "#io-channel-cells":
+    const: 1
+
+io-channel-cells:
+  - output

tests/drivers/build_all/dac/app.overlay

@@ -82,6 +82,7 @@
 				   <&test_gpio 0 0>,
 				   <&test_gpio 0 0>,
 				   <&test_gpio 0 0>,
+				   <&test_gpio 0 0>,
 				   <&test_gpio 0 0>;
 
 			test_spi_dac60508: dac60508@0 {
@@ -233,6 +234,19 @@
 				#io-channel-cells = <1>;
 				reset-gpios = <&test_gpio 0 0>;
 			};
+
+			test_spi_ad5592: ad5592@10 {
+				compatible = "adi,ad5592";
+				status = "okay";
+				reg = <0x10>;
+				spi-max-frequency = <0>;
+				reset-gpios = <&test_gpio 0 0>;
+
+				ad5592_dac: dac-controller {
+					compatible = "adi,ad5592-dac";
+					#io-channel-cells = <1>;
+				};
+			};
 		};
 	};
 };