Commit 1b5ceb55 authored by Billy Tsai's avatar Billy Tsai Committed by Jonathan Cameron
Browse files

iio: adc: aspeed: Support ast2600 adc. 



Make driver to support ast2600 adc device.
- Use shared reset controller
- Complete the vref configure function
- Add the model data for ast2600 adc

Signed-off-by: default avatarBilly Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20210922081520.30580-7-billy_tsai@aspeedtech.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 4c56572c

drivers/iio/adc/aspeed_adc.c

+96 −5
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Aspeed AST2400/2500 ADC

 * Aspeed AST2400/2500/2600 ADC

 *

 * Copyright (C) 2017 Google, Inc.

 * Copyright (C) 2021 Aspeed Technology Inc.
@@ -14,6 +14,7 @@ 
#include <linux/module.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <linux/regulator/consumer.h>

#include <linux/reset.h>

#include <linux/spinlock.h>

#include <linux/types.h>
@@ -81,6 +82,7 @@ struct aspeed_adc_model_data { 
struct aspeed_adc_data {

	struct device		*dev;

	const struct aspeed_adc_model_data *model_data;

	struct regulator	*regulator;

	void __iomem		*base;

	spinlock_t		clk_lock;

	struct clk_hw		*clk_prescaler;
@@ -217,14 +219,79 @@ static void aspeed_adc_power_down(void *data) 
	       priv_data->base + ASPEED_REG_ENGINE_CONTROL);

}



static void aspeed_adc_reg_disable(void *data)

{

	struct regulator *reg = data;



	regulator_disable(reg);

}



static int aspeed_adc_vref_config(struct iio_dev *indio_dev)

{

	struct aspeed_adc_data *data = iio_priv(indio_dev);

	int ret;

	u32 adc_engine_control_reg_val;



	if (data->model_data->vref_fixed_mv) {

		data->vref_mv = data->model_data->vref_fixed_mv;

		return 0;

	}

	adc_engine_control_reg_val =

		readl(data->base + ASPEED_REG_ENGINE_CONTROL);

	data->regulator = devm_regulator_get_optional(data->dev, "vref");

	if (!IS_ERR(data->regulator)) {

		ret = regulator_enable(data->regulator);

		if (ret)

			return ret;

		ret = devm_add_action_or_reset(

			data->dev, aspeed_adc_reg_disable, data->regulator);

		if (ret)

			return ret;

		data->vref_mv = regulator_get_voltage(data->regulator);

		/* Conversion from uV to mV */

		data->vref_mv /= 1000;

		if ((data->vref_mv >= 1550) && (data->vref_mv <= 2700))

			writel(adc_engine_control_reg_val |

				FIELD_PREP(

					ASPEED_ADC_REF_VOLTAGE,

					ASPEED_ADC_REF_VOLTAGE_EXT_HIGH),

			data->base + ASPEED_REG_ENGINE_CONTROL);

		else if ((data->vref_mv >= 900) && (data->vref_mv <= 1650))

			writel(adc_engine_control_reg_val |

				FIELD_PREP(

					ASPEED_ADC_REF_VOLTAGE,

					ASPEED_ADC_REF_VOLTAGE_EXT_LOW),

			data->base + ASPEED_REG_ENGINE_CONTROL);

		else {

			dev_err(data->dev, "Regulator voltage %d not support",

				data->vref_mv);

			return -EOPNOTSUPP;

		}

	} else {

		if (PTR_ERR(data->regulator) != -ENODEV)

			return PTR_ERR(data->regulator);

		data->vref_mv = 2500000;

		of_property_read_u32(data->dev->of_node,

				     "aspeed,int-vref-microvolt",

				     &data->vref_mv);

		/* Conversion from uV to mV */

		data->vref_mv /= 1000;

		if (data->vref_mv == 2500)

			writel(adc_engine_control_reg_val |

				FIELD_PREP(ASPEED_ADC_REF_VOLTAGE,

						ASPEED_ADC_REF_VOLTAGE_2500mV),

			data->base + ASPEED_REG_ENGINE_CONTROL);

		else if (data->vref_mv == 1200)

			writel(adc_engine_control_reg_val |

				FIELD_PREP(ASPEED_ADC_REF_VOLTAGE,

						ASPEED_ADC_REF_VOLTAGE_1200mV),

			data->base + ASPEED_REG_ENGINE_CONTROL);

		else {

			dev_err(data->dev, "Voltage %d not support", data->vref_mv);

			return -EOPNOTSUPP;

		}

	}



	return 0;

}
@@ -280,7 +347,7 @@ static int aspeed_adc_probe(struct platform_device *pdev) 
	if (IS_ERR(data->clk_scaler))

		return PTR_ERR(data->clk_scaler);



	data->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);

	data->rst = devm_reset_control_get_shared(&pdev->dev, NULL);

	if (IS_ERR(data->rst)) {

		dev_err(&pdev->dev,

			"invalid or missing reset controller device tree entry");
@@ -297,9 +364,13 @@ static int aspeed_adc_probe(struct platform_device *pdev) 
	if (ret)

		return ret;



	adc_engine_control_reg_val =

		readl(data->base + ASPEED_REG_ENGINE_CONTROL);

	adc_engine_control_reg_val |=

		FIELD_PREP(ASPEED_ADC_OP_MODE, ASPEED_ADC_OP_MODE_NORMAL) |

		ASPEED_ADC_ENGINE_ENABLE;

	/* Enable engine in normal mode. */

	writel(FIELD_PREP(ASPEED_ADC_OP_MODE, ASPEED_ADC_OP_MODE_NORMAL) |

		       ASPEED_ADC_ENGINE_ENABLE,

	writel(adc_engine_control_reg_val,

	       data->base + ASPEED_REG_ENGINE_CONTROL);



	ret = devm_add_action_or_reset(data->dev, aspeed_adc_power_down,
@@ -367,9 +438,29 @@ static const struct aspeed_adc_model_data ast2500_model_data = { 
	.num_channels = 16,

};



static const struct aspeed_adc_model_data ast2600_adc0_model_data = {

	.model_name = "ast2600-adc0",

	.min_sampling_rate = 10000,

	.max_sampling_rate = 500000,

	.wait_init_sequence = true,

	.scaler_bit_width = 16,

	.num_channels = 8,

};



static const struct aspeed_adc_model_data ast2600_adc1_model_data = {

	.model_name = "ast2600-adc1",

	.min_sampling_rate = 10000,

	.max_sampling_rate = 500000,

	.wait_init_sequence = true,

	.scaler_bit_width = 16,

	.num_channels = 8,

};



static const struct of_device_id aspeed_adc_matches[] = {

	{ .compatible = "aspeed,ast2400-adc", .data = &ast2400_model_data },

	{ .compatible = "aspeed,ast2500-adc", .data = &ast2500_model_data },

	{ .compatible = "aspeed,ast2600-adc0", .data = &ast2600_adc0_model_data },

	{ .compatible = "aspeed,ast2600-adc1", .data = &ast2600_adc1_model_data },

	{},

};

MODULE_DEVICE_TABLE(of, aspeed_adc_matches);
@@ -385,5 +476,5 @@ static struct platform_driver aspeed_adc_driver = { 
module_platform_driver(aspeed_adc_driver);



MODULE_AUTHOR("Rick Altherr <raltherr@google.com>");

MODULE_DESCRIPTION("Aspeed AST2400/2500 ADC Driver");

MODULE_DESCRIPTION("Aspeed AST2400/2500/2600 ADC Driver");

MODULE_LICENSE("GPL");