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@xxxxxxxxxxxxxx>
---
drivers/iio/adc/aspeed_adc.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c
index 76ae1c3f584b..6ce2f676c54a 100644
--- a/drivers/iio/adc/aspeed_adc.c
+++ b/drivers/iio/adc/aspeed_adc.c
@@ -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;
@@ -320,17 +324,23 @@ 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[] = {
--
2.25.1
