[RESEND v4 05/15] iio: adc: aspeed: Refactory model data structure

Jonathan Cameron
2021-08-29T15:13:18Z

On Tue, 24 Aug 2021 17:12:33 +0800
Billy Tsai <billy_tsai@aspeedtech.com> wrote:

> This patch refactory the model data structure to distinguish the
> function form differnet version of aspeed adc.

from different versions

> - Rename the vref_voltag to vref_fixed and add vref driver data

vref_voltage

> When driver probe will check vref_fixed value and store it
> to vref which isn't const value.
> - Add num_channels
> Make num_channles of iio device can be changed by differnet model_data

different

> - Add need_prescaler flag and scaler_bit_width
> The need_prescaler flag used to tell the driver the clock divider needs
> another prescaler and the scaler_bit_width to set the clock divider
> bitfiled width.

bitfield?

>
> 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 d85aa31ee3b1..f03c7921d534 100644
> --- a/drivers/iio/adc/aspeed_adc.c
> +++ b/drivers/iio/adc/aspeed_adc.c
> @@ -63,8 +63,11 @@ 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

Whilst here, you could make the name carry the information of the units.
e.g. vref_fixed_mv; That way we always know what the units are without having
to spot this comment.

> bool wait_init_sequence;
> + bool need_prescaler;
> + u8 scaler_bit_width;
> + unsigned int num_channels;
> };
>
> struct aspeed_adc_data {
> @@ -75,6 +78,7 @@ struct aspeed_adc_data {
> struct clk_hw *clk_prescaler;
> struct clk_hw *clk_scaler;
> struct reset_control *rst;
> + int vref;
vref_mv as above perhaps?
> };
>
> #define ASPEED_CHAN(_idx, _data_reg_addr) { \
> @@ -118,7 +122,7 @@ 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;
> *val2 = ASPEED_RESOLUTION_BITS;
> return IIO_VAL_FRACTIONAL_LOG2;
>
> @@ -312,17 +316,23 @@ 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 = 2500, // mV
> .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 = 1800, // mV
> .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[] = {