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iio: adc: aspeed: Restructure the model data 

This patch refactors the model data structure to distinguish the
function form different versions of aspeed ADC.
- Rename the vref_voltage to vref_fixed_mv and add vref_mv driver data
When driver probe will check vref_fixed_mv value and store it to vref_mv
which isn't const value.
- Add num_channels
Make num_channles of iio device can be changed by different model_data
- Add need_prescaler flag and scaler_bit_width
The need_prescaler flag is used to tell the driver the clock divider needs
another Prescaler and the scaler_bit_width to set the clock divider
bitfield width.

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20210922081520.30580-3-billy_tsai@aspeedtech.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Billy Tsai 2021-09-22 16:15:11 +08:00 committed by Jonathan Cameron
parent 89c65417da
commit eaa74a8d51
1 changed files with 15 additions and 5 deletions
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20
drivers/iio/adc/aspeed_adc.c
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@ -71,8 +71,11 @@ struct aspeed_adc_model_data {
const char *model_name;
unsigned int min_sampling_rate; // Hz
unsigned int max_sampling_rate; // Hz
unsigned int vref_voltage; // mV
unsigned int vref_fixed_mv;
bool wait_init_sequence;
bool need_prescaler;
u8 scaler_bit_width;
unsigned int num_channels;
};
struct aspeed_adc_data {
@ -83,6 +86,7 @@ struct aspeed_adc_data {
struct clk_hw *clk_prescaler;
struct clk_hw *clk_scaler;
struct reset_control *rst;
int vref_mv;
};
#define ASPEED_CHAN(_idx, _data_reg_addr) { \
@ -126,7 +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_voltage;
*val = data->model_data->vref_fixed_mv;
*val2 = ASPEED_RESOLUTION_BITS;
return IIO_VAL_FRACTIONAL_LOG2;
@ -279,7 +283,7 @@ static int aspeed_adc_probe(struct platform_device *pdev)
indio_dev->info = &aspeed_adc_iio_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = aspeed_adc_iio_channels;
indio_dev->num_channels = ARRAY_SIZE(aspeed_adc_iio_channels);
indio_dev->num_channels = data->model_data->num_channels;
ret = iio_device_register(indio_dev);
if (ret)
@ -319,17 +323,23 @@ static int aspeed_adc_remove(struct platform_device *pdev)
static const struct aspeed_adc_model_data ast2400_model_data = {
.model_name = "ast2400-adc",
.vref_voltage = 2500, // mV
.vref_fixed_mv = 2500,
.min_sampling_rate = 10000,
.max_sampling_rate = 500000,
.need_prescaler = true,
.scaler_bit_width = 10,
.num_channels = 16,
};
static const struct aspeed_adc_model_data ast2500_model_data = {
.model_name = "ast2500-adc",
.vref_voltage = 1800, // mV
.vref_fixed_mv = 1800,
.min_sampling_rate = 1,
.max_sampling_rate = 1000000,
.wait_init_sequence = true,
.need_prescaler = true,
.scaler_bit_width = 10,
.num_channels = 16,
};
static const struct of_device_id aspeed_adc_matches[] = {