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   | 91 +++++++++++++++++++++++++++++++++++++
 include/linux/iio/adc/sun4i-gpadc.h | 18 ++++++++
 2 files changed, 109 insertions(+)

diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
index c7b46c82e3e5..d5c7971b2558 100644
--- a/drivers/iio/adc/sun4i-gpadc-iio.c
+++ b/drivers/iio/adc/sun4i-gpadc-iio.c

@@ -72,6 +72,7 @@ struct gpadc_data {
 	u32		temp_data_base;
 	int		sensor_count;
 	bool		supports_nvmem;
+	u32		ths_irq_clear;
 };
 
 static irqreturn_t sun4i_gpadc_data_irq_handler(int irq, void *dev_id);

@@ -79,6 +80,10 @@ static irqreturn_t sun4i_gpadc_data_irq_handler(int irq, void *dev_id);
 static int sun4i_ths_resume(struct sun4i_gpadc_iio *info);
 static int sun4i_ths_suspend(struct sun4i_gpadc_iio *info);
 
+static int sun8i_h3_ths_resume(struct sun4i_gpadc_iio *info);
+static int sun8i_h3_ths_suspend(struct sun4i_gpadc_iio *info);
+static irqreturn_t sunx8i_h3_irq_thread(int irq, void *data);
+
 static const struct gpadc_data sun4i_gpadc_data = {
 	.temp_offset = -1932,
 	.temp_scale = 133,

@@ -137,6 +142,22 @@ static const struct gpadc_data sun8i_a33_gpadc_data = {
 	.sensor_count = 1,
 };
 
+static const struct gpadc_data sun8i_h3_ths_data = {
+	.temp_offset = -1791,
+	.temp_scale = -121,
+	.temp_data_base = SUN8I_H3_THS_TDATA0,
+	.ths_irq_thread = sunx8i_h3_irq_thread,
+	.support_irq = true,
+	.has_bus_clk = true,
+	.has_bus_rst = true,
+	.has_mod_clk = true,
+	.sensor_count = 1,
+	.supports_nvmem = true,
+	.ths_resume = sun8i_h3_ths_resume,
+	.ths_suspend = sun8i_h3_ths_suspend,
+	.ths_irq_clear = SUN8I_H3_THS_INTS_TDATA_IRQ_0,
+};
+
 struct sun4i_sensor_tzd {
 	struct sun4i_gpadc_iio		*info;
 	struct thermal_zone_device	*tzd;

@@ -409,6 +430,31 @@ static irqreturn_t sun4i_gpadc_data_irq_handler(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t sunx8i_h3_irq_thread(int irq, void *data)
+{
+	struct sun4i_gpadc_iio *info = data;
+	int i;
+
+	regmap_write(info->regmap, SUN8I_H3_THS_STAT,
+			info->data->ths_irq_clear);
+
+	for (i = 0; i < info->data->sensor_count; i++)
+		thermal_zone_device_update(info->tzds[i].tzd,
+						THERMAL_EVENT_TEMP_SAMPLE);
+
+	return IRQ_HANDLED;
+}
+
+static int sun8i_h3_calibrate(struct sun4i_gpadc_iio *info)
+{
+//	regmap_write(info->regmap, SUNXI_THS_CDATA_0_1,
+//			info->calibration_data[0]);
+//	regmap_write(info->regmap, SUNXI_THS_CDATA_2_3,
+//			info->calibration_data[1]);

+
+	return 0;
+}
+
 static int sun4i_gpadc_runtime_suspend(struct device *dev)
 {
 	struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(dev));

@@ -428,6 +474,16 @@ static int sun4i_ths_suspend(struct sun4i_gpadc_iio *info)
 	return 0;
 }
 
+static int sun8i_h3_ths_suspend(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_resume(struct device *dev)
 {
 	struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(dev));

@@ -454,6 +510,37 @@ static int sun4i_ths_resume(struct sun4i_gpadc_iio *info)
 	return 0;
 }
 
+static int sun8i_h3_ths_resume(struct sun4i_gpadc_iio *info)
+{
+	u32 value;
+
+	sun8i_h3_calibrate(info);
+
+	regmap_write(info->regmap, SUN8I_H3_THS_CTRL0,
+			SUN4I_GPADC_CTRL0_T_ACQ(0xff));
+
+	regmap_write(info->regmap, SUN8I_H3_THS_CTRL2,
+			SUN8I_H3_THS_ACQ1(0x3f));
+
+	regmap_write(info->regmap, SUN8I_H3_THS_STAT,
+			SUN8I_H3_THS_INTS_TDATA_IRQ_0);
+
+	regmap_write(info->regmap, SUN8I_H3_THS_FILTER,
+			SUN4I_GPADC_CTRL3_FILTER_EN |
+			SUN4I_GPADC_CTRL3_FILTER_TYPE(0x2));
+
+	regmap_write(info->regmap, SUN8I_H3_THS_INTC,
+			SUN8I_H3_THS_INTC_TDATA_IRQ_EN0 |
+			SUN8I_H3_THS_TEMP_PERIOD(0x55));
+
+	regmap_read(info->regmap, SUN8I_H3_THS_CTRL2, &value);
+
+	regmap_write(info->regmap, SUN8I_H3_THS_CTRL2,
+			SUN8I_H3_THS_TEMP_SENSE_EN0 | value);