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Date: Sun, 10 Apr 2022 17:33:38 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Cixi Geng <gengcixi@...il.com>
Cc: lars@...afoo.de, robh+dt@...nel.org, orsonzhai@...il.com,
baolin.wang7@...il.com, zhang.lyra@...il.com,
yuming.zhu1@...soc.com, linux-iio@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 6/7] iio: adc: sc27xx: add support for PMIC sc2730
On Thu, 7 Apr 2022 16:21:47 +0800
Cixi Geng <gengcixi@...il.com> wrote:
> From: Cixi Geng <cixi.geng1@...soc.com>
>
> sc2730 is the product of sc27xx series.
>
> Co-developed-by: Yuming Zhu <yuming.zhu1@...soc.com>
> Signed-off-by: Yuming Zhu <yuming.zhu1@...soc.com>
> Signed-off-by: Cixi Geng <cixi.geng1@...soc.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},
> { }
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