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iio: adc: aspeed: Add vref config function

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Add the function to check the vref_fixed_mv and set the value to driver
data.

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20210922081520.30580-4-billy_tsai@aspeedtech.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Billy Tsai 2021-09-22 16:15:12 +08:00 committed by Jonathan Cameron
parent eaa74a8d51
commit 1de952a4b1
1 changed files with 17 additions and 1 deletions
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18
drivers/iio/adc/aspeed_adc.c
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@ -130,7 +130,7 @@ static int aspeed_adc_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = data->model_data->vref_fixed_mv;
*val = data->vref_mv;
*val2 = ASPEED_RESOLUTION_BITS;
return IIO_VAL_FRACTIONAL_LOG2;
@ -195,6 +195,17 @@ static const struct iio_info aspeed_adc_iio_info = {
.debugfs_reg_access = aspeed_adc_reg_access,
};
static int aspeed_adc_vref_config(struct iio_dev *indio_dev)
{
struct aspeed_adc_data *data = iio_priv(indio_dev);
if (data->model_data->vref_fixed_mv) {
data->vref_mv = data->model_data->vref_fixed_mv;
return 0;
}
return 0;
}
static int aspeed_adc_probe(struct platform_device *pdev)
{
struct iio_dev *indio_dev;
@ -249,6 +260,10 @@ static int aspeed_adc_probe(struct platform_device *pdev)
}
reset_control_deassert(data->rst);
ret = aspeed_adc_vref_config(indio_dev);
if (ret)
goto vref_config_error;
if (data->model_data->wait_init_sequence) {
/* Enable engine in normal mode. */
writel(FIELD_PREP(ASPEED_ADC_OP_MODE,
@ -297,6 +312,7 @@ static int aspeed_adc_probe(struct platform_device *pdev)
clk_disable_unprepare(data->clk_scaler->clk);
clk_enable_error:
poll_timeout_error:
vref_config_error:
reset_control_assert(data->rst);
reset_error:
clk_hw_unregister_divider(data->clk_scaler);