iio: adc: sc27xx: add support for PMIC sc2730

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>
Link: https://lore.kernel.org/r/20220419142458.884933-8-gengcixi@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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)
@@ -301,6 +303,80 @@ 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) {
@@ -357,6 +433,33 @@ 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++) {
+		switch (i) {
+		case 5:
+		case 10:
+		case 19:
+		case 30:
+		case 31:
+			data->channel_scale[i] = 3;
+			break;
+		case 7:
+		case 9:
+			data->channel_scale[i] = 2;
+			break;
+		case 13:
+			data->channel_scale[i] = 1;
+			break;
+		default:
+			data->channel_scale[i] = 0;
+			break;
+		}
+	}
+}
+
 static void sc2731_adc_scale_init(struct sc27xx_adc_data *data)
 {
 	int i;
@@ -718,6 +821,18 @@ static const struct sc27xx_adc_variant_data sc2731_data = {
 	.set_volref = false,
 };
 
+static const struct sc27xx_adc_variant_data sc2730_data = {
+	.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,
+	.set_volref = false,
+};
+
 static const struct sc27xx_adc_variant_data sc2721_data = {
 	.module_en = SC2731_MODULE_EN,
 	.clk_en = SC2721_ARM_CLK_EN,
@@ -829,6 +944,7 @@ 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},
 	{ }