[RESEND v4 10/15] iio: adc: aspeed: Support ast2600 adc.

Billy Tsai
2021-08-24T09:12:38Z

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: Billy Tsai <billy_tsai@aspeedtech.com>
---
drivers/iio/adc/aspeed_adc.c | 106 +++++++++++++++++++++++++++++++++--
1 file changed, 100 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c
index 1c87e12a0cab..ea3e9a52fcc9 100644
--- a/drivers/iio/adc/aspeed_adc.c
+++ b/drivers/iio/adc/aspeed_adc.c
@@ -1,6 +1,6 @@
// 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>
@@ -73,6 +74,7 @@ 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;
@@ -208,14 +210,80 @@ static void aspeed_adc_clk_disable_unprepare(void *data)
clk_disable_unprepare(clk);
}

+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 =
+ readl(data->base + ASPEED_REG_ENGINE_CONTROL);

if (data->model_data->vref_fixed) {
data->vref = data->model_data->vref_fixed;
return 0;
}
+
+ 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 = regulator_get_voltage(data->regulator);
+ /* Conversion from uV to mV */
+ data->vref /= 1000;
+ if ((data->vref >= 1550) && (data->vref <= 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 >= 900) && (data->vref <= 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);
+ return -EOPNOTSUPP;
+ }
+ } else {
+ if (PTR_ERR(data->regulator) != -ENODEV)
+ return PTR_ERR(data->regulator);
+ ret = of_property_read_u32(data->dev->of_node,
+ "aspeed,int_vref_mv", &data->vref);
+ if (ret < 0) {
+ dev_warn(data->dev,
+ "Using default vref: internal 2500 mv");
+ data->vref = 2500;
+ }
+ if (data->vref == 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 == 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);
+ return -EOPNOTSUPP;
+ }
+ }
+
return 0;
}

@@ -279,7 +347,7 @@ static int aspeed_adc_probe(struct platform_device *pdev)
if (ret)
return ret;

- 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");
@@ -297,10 +365,14 @@ static int aspeed_adc_probe(struct platform_device *pdev)
return ret;

if (data->model_data->wait_init_sequence) {
+ 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);

/* Wait for initial sequence complete. */
@@ -326,6 +398,8 @@ static int aspeed_adc_probe(struct platform_device *pdev)
return ret;

adc_engine_control_reg_val =
+ readl(data->base + ASPEED_REG_ENGINE_CONTROL);
+ adc_engine_control_reg_val |=
ASPEED_ADC_CTRL_CHANNEL |
FIELD_PREP(ASPEED_ADC_OP_MODE, ASPEED_ADC_OP_MODE_NORMAL) |
ASPEED_ADC_ENGINE_ENABLE;
@@ -376,9 +450,29 @@ 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);
@@ -395,5 +489,5 @@ 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");
--
2.25.1