linux-kernel - Re: [v5 05/15] iio: adc: aspeed: Refactory model data structure

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Date:   Sun, 5 Sep 2021 15:37:20 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Billy Tsai <billy_tsai@...eedtech.com>
Cc:     <lars@...afoo.de>, <pmeerw@...erw.net>, <robh+dt@...nel.org>,
        <joel@....id.au>, <andrew@...id.au>, <p.zabel@...gutronix.de>,
        <lgirdwood@...il.com>, <broonie@...nel.org>,
        <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-aspeed@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        <BMC-SW@...eedtech.com>
Subject: Re: [v5 05/15] iio: adc: aspeed: Refactory model data structure

On Tue, 31 Aug 2021 15:14:48 +0800
Billy Tsai <billy_tsai@...eedtech.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@...eedtech.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[] = {