[v5 05/15] iio: adc: aspeed: Refactory model data structure

Jonathan Cameron
2021-09-05T14:37:20Z

On Tue, 31 Aug 2021 15:14:48 +0800
Billy Tsai <billy_tsai@aspeedtech.com> wrote:

Title. Refactor (refactory isn't a word as far as I know though it perhaps should
be ;)

If you are rerolling the latter part of this series, merge patch 7 down into this one.
If not, it's fine as it stands. That one is trivial and a direct result of this one.

Jonathan

> 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>
> ---
> 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[] = {