Re: [PATCH V3 6/7] iio: adc: sc27xx: add support for PMIC sc2730

[Jonathan Cameron <jic23@kernel.org>]

On Thu,  7 Apr 2022 16:21:47 +0800
Cixi Geng <gengcixi@gmail.com> wrote:

> From: Cixi Geng <cixi.geng1@unisoc.com>
> 
> sc2730 is the product of sc27xx series.
> 
> Co-developed-by: Yuming Zhu <yuming.zhu1@unisoc.com>
> Signed-off-by: Yuming Zhu <yuming.zhu1@unisoc.com>
> Signed-off-by: Cixi Geng <cixi.geng1@unisoc.com>

One minor comment inline.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/sc27xx_adc.c | 105 +++++++++++++++++++++++++++++++++++
>  1 file changed, 105 insertions(+)
> 
> diff --git a/drivers/iio/adc/sc27xx_adc.c b/drivers/iio/adc/sc27xx_adc.c
> index eb9e789dd8ee..43655a818d09 100644
> --- a/drivers/iio/adc/sc27xx_adc.c
> +++ b/drivers/iio/adc/sc27xx_adc.c
> @@ -13,9 +13,11 @@
>  #include <linux/slab.h>
>  
>  /* PMIC global registers definition */
> +#define SC2730_MODULE_EN		0x1808
>  #define SC2731_MODULE_EN		0xc08
>  #define SC27XX_MODULE_ADC_EN		BIT(5)
>  #define SC2721_ARM_CLK_EN		0xc0c
> +#define SC2730_ARM_CLK_EN		0x180c
>  #define SC2731_ARM_CLK_EN		0xc10
>  #define SC27XX_CLK_ADC_EN		BIT(5)
>  #define SC27XX_CLK_ADC_CLK_EN		BIT(6)
> @@ -307,6 +309,80 @@ static int sc2721_adc_get_ratio(int channel, int scale)
>  	return SC27XX_VOLT_RATIO(1, 1);
>  }
>  
> +static int sc2730_adc_get_ratio(int channel, int scale)
> +{
> +	switch (channel) {
> +	case 14:
> +		switch (scale) {
> +		case 0:
> +			return SC27XX_VOLT_RATIO(68, 900);
> +		case 1:
> +			return SC27XX_VOLT_RATIO(68, 1760);
> +		case 2:
> +			return SC27XX_VOLT_RATIO(68, 2327);
> +		case 3:
> +			return SC27XX_VOLT_RATIO(68, 3654);
> +		default:
> +			return SC27XX_VOLT_RATIO(1, 1);
> +		}
> +	case 15:
> +		switch (scale) {
> +		case 0:
> +			return SC27XX_VOLT_RATIO(1, 3);
> +		case 1:
> +			return SC27XX_VOLT_RATIO(1000, 5865);
> +		case 2:
> +			return SC27XX_VOLT_RATIO(500, 3879);
> +		case 3:
> +			return SC27XX_VOLT_RATIO(500, 6090);
> +		default:
> +			return SC27XX_VOLT_RATIO(1, 1);
> +		}
> +	case 16:
> +		switch (scale) {
> +		case 0:
> +			return SC27XX_VOLT_RATIO(48, 100);
> +		case 1:
> +			return SC27XX_VOLT_RATIO(480, 1955);
> +		case 2:
> +			return SC27XX_VOLT_RATIO(480, 2586);
> +		case 3:
> +			return SC27XX_VOLT_RATIO(48, 406);
> +		default:
> +			return SC27XX_VOLT_RATIO(1, 1);
> +		}
> +	case 21:
> +	case 22:
> +	case 23:
> +		switch (scale) {
> +		case 0:
> +			return SC27XX_VOLT_RATIO(3, 8);
> +		case 1:
> +			return SC27XX_VOLT_RATIO(375, 1955);
> +		case 2:
> +			return SC27XX_VOLT_RATIO(375, 2586);
> +		case 3:
> +			return SC27XX_VOLT_RATIO(300, 3248);
> +		default:
> +			return SC27XX_VOLT_RATIO(1, 1);
> +		}
> +	default:
> +		switch (scale) {
> +		case 0:
> +			return SC27XX_VOLT_RATIO(1, 1);
> +		case 1:
> +			return SC27XX_VOLT_RATIO(1000, 1955);
> +		case 2:
> +			return SC27XX_VOLT_RATIO(1000, 2586);
> +		case 3:
> +			return SC27XX_VOLT_RATIO(1000, 4060);
> +		default:
> +			return SC27XX_VOLT_RATIO(1, 1);
> +		}
> +	}
> +	return SC27XX_VOLT_RATIO(1, 1);
> +}
> +
>  static int sc2731_adc_get_ratio(int channel, int scale)
>  {
>  	switch (channel) {
> @@ -363,6 +439,22 @@ static void sc2720_adc_scale_init(struct sc27xx_adc_data *data)
>  	}
>  }
>  
> +static void sc2730_adc_scale_init(struct sc27xx_adc_data *data)
> +{
> +	int i;
> +
> +	for (i = 0; i < SC27XX_ADC_CHANNEL_MAX; i++) {
> +		if (i == 5 || i == 10 || i == 19 || i == 30 || i == 31)

I'd keep this looking like the other instances (in the previous patch)
and use a switch statement.  They are more lines, but easier to read.

> +			data->channel_scale[i] = 3;
> +		else if (i == 7 || i == 9)
> +			data->channel_scale[i] = 2;
> +		else if (i == 13)
> +			data->channel_scale[i] = 1;
> +		else
> +			data->channel_scale[i] = 0;
> +	}
> +}
> +
>  static void sc2731_adc_scale_init(struct sc27xx_adc_data *data)
>  {
>  	int i;
> @@ -720,6 +812,18 @@ static const struct sc27xx_adc_variant_data sc2731_data = {
>  	.get_ratio = sc2731_adc_get_ratio,
>  };
>  
> +static const struct sc27xx_adc_variant_data sc2730_data = {
> +	.pmic_type = SC27XX_ADC,
> +	.module_en = SC2730_MODULE_EN,
> +	.clk_en = SC2730_ARM_CLK_EN,
> +	.scale_shift = SC27XX_ADC_SCALE_SHIFT,
> +	.scale_mask = SC27XX_ADC_SCALE_MASK,
> +	.bscale_cal = &big_scale_graph_calib,
> +	.sscale_cal = &small_scale_graph_calib,
> +	.init_scale = sc2730_adc_scale_init,
> +	.get_ratio = sc2730_adc_get_ratio,
> +};
> +
>  static const struct sc27xx_adc_variant_data sc2721_data = {
>  	.pmic_type = SC2721_ADC,
>  	.module_en = SC2731_MODULE_EN,
> @@ -834,6 +938,7 @@ static int sc27xx_adc_probe(struct platform_device *pdev)
>  
>  static const struct of_device_id sc27xx_adc_of_match[] = {
>  	{ .compatible = "sprd,sc2731-adc", .data = &sc2731_data},
> +	{ .compatible = "sprd,sc2730-adc", .data = &sc2730_data},
>  	{ .compatible = "sprd,sc2721-adc", .data = &sc2721_data},
>  	{ .compatible = "sprd,sc2720-adc", .data = &sc2720_data},
>  	{ }