drivers: dac: Add driver for mcux lpdac (2ffead78) · Commits · Wenxi XU / zephyr

drivers/dac/CMakeLists.txt

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		@@ -4,6 +4,7 @@ zephyr_syscall_header(${ZEPHYR_BASE}/include/zephyr/drivers/dac.h)

		zephyr_library()

		zephyr_library_sources_ifdef(CONFIG_DAC_MCUX_LPDAC dac_mcux_lpdac.c)
		zephyr_library_sources_ifdef(CONFIG_DAC_MCUX_DAC dac_mcux_dac.c)
		zephyr_library_sources_ifdef(CONFIG_DAC_MCUX_DAC32 dac_mcux_dac32.c)
		zephyr_library_sources_ifdef(CONFIG_DAC_STM32 dac_stm32.c)

drivers/dac/Kconfig.mcux

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		@@ -19,6 +19,13 @@ config DAC_MCUX_DAC32
		help
		Enable the driver for the NXP Kinetis MCUX DAC32.

		config DAC_MCUX_LPDAC
		bool "NXP MCUX LPDAC driver"
		default y
		depends on DT_HAS_NXP_LPDAC_ENABLED
		help
		Enable the driver for the NXP MCUX LPDAC.

		config DAC_MCUX_DAC32_TESTOUT
		bool "DAC test output"
		depends on DAC_MCUX_DAC32

drivers/dac/dac_mcux_lpdac.c

0 → 100644

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		/*
		* Copyright (c) 2020 Henrik Brix Andersen <henrik@brixandersen.dk>
		* Copyright (c) 2023, NXP
		*
		* SPDX-License-Identifier: Apache-2.0
		*/
		#define DT_DRV_COMPAT nxp_lpdac

		#include <zephyr/kernel.h>
		#include <zephyr/drivers/dac.h>
		#include <zephyr/logging/log.h>

		#include <fsl_dac.h>

		LOG_MODULE_REGISTER(dac_mcux_lpdac, CONFIG_DAC_LOG_LEVEL);

		struct mcux_lpdac_config {
		LPDAC_Type *base;
		dac_reference_voltage_source_t ref_voltage;
		bool low_power;
		};

		struct mcux_lpdac_data {
		bool configured;
		};

		static int mcux_lpdac_channel_setup(const struct device *dev,
		const struct dac_channel_cfg *channel_cfg)
		{
		const struct mcux_lpdac_config *config = dev->config;
		struct mcux_lpdac_data *data = dev->data;
		dac_config_t dac_config;

		if (channel_cfg->channel_id != 0) {
		LOG_ERR("unsupported channel %d", channel_cfg->channel_id);
		return -ENOTSUP;
		}

		if (channel_cfg->resolution != 12) {
		LOG_ERR("unsupported resolution %d", channel_cfg->resolution);
		return -ENOTSUP;
		}

		DAC_GetDefaultConfig(&dac_config);
		dac_config.referenceVoltageSource = config->ref_voltage;
		#if defined(FSL_FEATURE_LPDAC_HAS_GCR_BUF_SPD_CTRL) && FSL_FEATURE_LPDAC_HAS_GCR_BUF_SPD_CTRL
		dac_config.enableLowerLowPowerMode = config->low_power;
		#else
		dac_config.enableLowPowerMode = config->low_power;
		#endif
		DAC_Init(config->base, &dac_config);
		DAC_Enable(config->base, false);
		data->configured = true;

		return 0;
		}

		static int mcux_lpdac_write_value(const struct device *dev, uint8_t channel, uint32_t value)
		{
		const struct mcux_lpdac_config *config = dev->config;
		struct mcux_lpdac_data *data = dev->data;

		if (!data->configured) {
		LOG_ERR("channel not initialized");
		return -EINVAL;
		}

		if (channel != 0) {
		LOG_ERR("unsupported channel %d", channel);
		return -ENOTSUP;
		}

		if (value >= 4096) {
		LOG_ERR("unsupported value %d", value);
		return -EINVAL;
		}

		DAC_Enable(config->base, true);
		DAC_SetData(config->base, value);

		return 0;
		}

		static int mcux_lpdac_init(const struct device *dev)
		{
		return 0;
		}

		static const struct dac_driver_api mcux_lpdac_driver_api = {
		.channel_setup = mcux_lpdac_channel_setup,
		.write_value = mcux_lpdac_write_value,
		};

		#define MCUX_LPDAC_INIT(n) \
		static struct mcux_lpdac_data mcux_lpdac_data_##n; \
		\
		static const struct mcux_lpdac_config mcux_lpdac_config_##n = { \
		.base = (LPDAC_Type *)DT_INST_REG_ADDR(n), \
		.ref_voltage = DT_INST_PROP(n, voltage_reference), \
		.low_power = DT_INST_PROP(n, low_power_mode), \
		}; \
		\
		DEVICE_DT_INST_DEFINE(n, mcux_lpdac_init, NULL, &mcux_lpdac_data_##n, \
		&mcux_lpdac_config_##n, POST_KERNEL, CONFIG_DAC_INIT_PRIORITY, \
		&mcux_lpdac_driver_api);

		DT_INST_FOREACH_STATUS_OKAY(MCUX_LPDAC_INIT)

dts/bindings/dac/nxp,lpdac.yaml

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		# Copyright (c) 2023, NXP
		# SPDX-License-Identifier: Apache-2.0

		description: NXP MCUX LPDAC

		compatible: "nxp,lpdac"

		include: dac-controller.yaml

		properties:
		reg:
		required: true

		voltage-reference:
		type: int
		required: true
		description: \|
		DAC voltage reference select. The meaning of the value may be
		different for different SoCs.

		low-power-mode:
		type: boolean
		description: Enable low-power mode

		"#io-channel-cells":
		const: 1

		io-channel-cells:
		- output

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