This patch adds support for the H3 ths sensor.

The H3 supports interrupts. The interrupt is configured to update the
the sensor values every second. The calibration data is writen at the
begin of the init process.

Signed-off-by: Philipp Rossak <redacted>
---
 drivers/iio/adc/sun4i-gpadc-iio.c | 86 +++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/sun4i-gpadc.h   | 22 ++++++++++
 2 files changed, 108 insertions(+)

diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
index b7b5451226b0..8196203d65fe 100644
--- a/drivers/iio/adc/sun4i-gpadc-iio.c
+++ b/drivers/iio/adc/sun4i-gpadc-iio.c

@@ -61,6 +61,9 @@ struct sun4i_gpadc_iio;
 static int sun4i_gpadc_sample_start(struct sun4i_gpadc_iio *info);
 static int sun4i_gpadc_sample_end(struct sun4i_gpadc_iio *info);
 
+static int sunxi_ths_sample_start(struct sun4i_gpadc_iio *info);
+static int sunxi_ths_sample_end(struct sun4i_gpadc_iio *info);
+
 struct gpadc_data {
 	int		temp_offset;
 	int		temp_scale;

@@ -71,6 +74,10 @@ struct gpadc_data {
 	unsigned int	temp_data[MAX_SENSOR_COUNT];
 	int		(*sample_start)(struct sun4i_gpadc_iio *info);
 	int		(*sample_end)(struct sun4i_gpadc_iio *info);
+	u32		ctrl0_map;
+	u32		ctrl2_map;
+	u32		sensor_en_map;
+	u32		filter_map;

 	u32		irq_clear_map;
 	u32		irq_control_map;
 	bool		has_bus_clk;

@@ -138,6 +145,31 @@ static const struct gpadc_data sun8i_a33_gpadc_data = {
 	.support_irq = false,
 };
 
+static const struct gpadc_data sun8i_h3_ths_data = {
+	.temp_offset = -1791,
+	.temp_scale = -121,
+	.temp_data = {SUN8I_H3_THS_TDATA0, 0, 0, 0},
+	.sample_start = sunxi_ths_sample_start,
+	.sample_end = sunxi_ths_sample_end,
+	.has_bus_clk = true,
+	.has_bus_rst = true,
+	.has_mod_clk = true,
+	.sensor_count = 1,
+	.supports_nvmem = true,
+	.support_irq = true,
+	.ctrl0_map = SUN4I_GPADC_CTRL0_T_ACQ(0xff),
+	.ctrl2_map = SUN8I_H3_THS_ACQ1(0x3f),
+	.sensor_en_map = SUN8I_H3_THS_TEMP_SENSE_EN0,
+	.filter_map = SUN4I_GPADC_CTRL3_FILTER_EN |
+		SUN4I_GPADC_CTRL3_FILTER_TYPE(0x2),
+	.irq_clear_map = SUN8I_H3_THS_INTS_ALARM_INT_0 |
+			SUN8I_H3_THS_INTS_SHUT_INT_0   |
+			SUN8I_H3_THS_INTS_TDATA_IRQ_0  |
+			SUN8I_H3_THS_INTS_ALARM_OFF_0,
+	.irq_control_map = SUN8I_H3_THS_INTC_TDATA_IRQ_EN0 |
+		SUN8I_H3_THS_TEMP_PERIOD(0x7),
+};
+
 struct sun4i_gpadc_iio {
 	struct iio_dev			*indio_dev;
 	struct completion		completion;

@@ -462,6 +494,16 @@ static int sun4i_gpadc_sample_end(struct sun4i_gpadc_iio *info)
 	return 0;
 }
 
+static int sunxi_ths_sample_end(struct sun4i_gpadc_iio *info)
+{
+	/* Disable ths interrupt */
+	regmap_write(info->regmap, SUN8I_H3_THS_INTC, 0x0);
+	/* Disable temperature sensor */
+	regmap_write(info->regmap, SUN8I_H3_THS_CTRL2, 0x0);
+
+	return 0;
+}
+
 static int sun4i_gpadc_runtime_suspend(struct device *dev)
 {
 	struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(dev));

@@ -473,6 +515,17 @@ static int sun4i_gpadc_runtime_suspend(struct device *dev)
 	return info->data->sample_end(info);
 }
 
+static void sunxi_calibrate(struct sun4i_gpadc_iio *info)
+{
+	if (info->has_calibration_data[0])
+		regmap_write(info->regmap, SUNXI_THS_CDATA_0_1,
+			info->calibration_data[0]);
+
+	if (info->has_calibration_data[1])
+		regmap_write(info->regmap, SUNXI_THS_CDATA_2_3,
+			info->calibration_data[1]);
+}
+
 static int sun4i_gpadc_sample_start(struct sun4i_gpadc_iio *info)
 {
 	/* clkin = 6MHz */

@@ -492,6 +545,35 @@ static int sun4i_gpadc_sample_start(struct sun4i_gpadc_iio *info)
 	return 0;
 }
 
+static int sunxi_ths_sample_start(struct sun4i_gpadc_iio *info)