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: Billy Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20210922081520.30580-7-billy_tsai@aspeedtech.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c
index 7c9ac72..846fead 100644 (file)
--- 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>
@@ -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");