diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 25378c5..429ef16 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -384,6 +384,18 @@ config ROCKCHIP_SARADC
 	  To compile this driver as a module, choose M here: the
 	  module will be called rockchip_saradc.
 
+config SUN4I_GPADC
+	tristate "Support for the Allwinner SoCs GPADC"
+	depends on IIO
+	depends on MFD_SUN4I_GPADC
+	help
+	  Say yes here to build support for Allwinner (A10, A13 and A31) SoCs
+	  GPADC. This ADC provides 4 channels which can be used as an ADC or as
+	  a touchscreen input and one channel for thermal sensor.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called sunxi-gpadc-iio.
+
 config TI_ADC081C
 	tristate "Texas Instruments ADC081C/ADC101C/ADC121C family"
 	depends on I2C
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 38638d4..14d1739 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
 obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
 obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o
 obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
+obj-$(CONFIG_SUN4I_GPADC) += sunxi-gpadc-iio.o
 obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
 obj-$(CONFIG_TI_ADC0832) += ti-adc0832.o
 obj-$(CONFIG_TI_ADC128S052) += ti-adc128s052.o
diff --git a/drivers/iio/adc/sunxi-gpadc-iio.c b/drivers/iio/adc/sunxi-gpadc-iio.c
new file mode 100644
index 0000000..5647688
--- /dev/null
+++ b/drivers/iio/adc/sunxi-gpadc-iio.c
@@ -0,0 +1,513 @@
+/* ADC driver for sunxi platforms' (A10, A13 and A31) GPADC
+ *
+ * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ *
+ * The Allwinner SoCs all have an ADC that can also act as a touchscreen
+ * controller and a thermal sensor.
+ * The thermal sensor works only when the ADC acts as a touchscreen controller
+ * and is configured to throw an interrupt every fixed periods of time (let say
+ * every X seconds).
+ * One would be tempted to disable the IP on the hardware side rather than
+ * disabling interrupts to save some power but that reset the internal clock of
+ * the IP, resulting in having to wait X seconds every time we want to read the
+ * value of the thermal sensor.
+ * This is also the reason of using autosuspend in pm_runtime. If there were no
+ * autosuspend, the thermal sensor would need X seconds after every
+ * pm_runtime_get_sync to get a value from the ADC. The autosuspend allows the
+ * thermal sensor to be requested again in a certain time span before it gets
+ * shutdown for not being used.
+ */
+
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/thermal.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/driver.h>
+#include <linux/iio/machine.h>
+#include <linux/mfd/sunxi-gpadc-mfd.h>
+
+const unsigned int sun4i_gpadc_chan_select(unsigned int chan)
+{
+	return SUNXI_GPADC_TP_CTRL1_ADC_CHAN_SELECT(chan);
+}
+
+const unsigned int sun6i_gpadc_chan_select(unsigned int chan)
+{
+	return SUNXI_GPADC_TP_CTRL1_SUN6I_ADC_CHAN_SELECT(chan);
+}
+
+struct sunxi_gpadc_soc_specific {
+	const int		temp_offset;
+	const int		temp_scale;
+	const unsigned int	tp_mode_en;
+	const unsigned int	tp_adc_select;
+	const unsigned int	(*adc_chan_select)(unsigned int chan);
+};
+
+static const struct sunxi_gpadc_soc_specific sun4i_gpadc_soc_specific = {
+	.temp_offset = -1932,
+	.temp_scale = 133,
+	.tp_mode_en = SUNXI_GPADC_TP_CTRL1_TP_MODE_EN,
+	.tp_adc_select = SUNXI_GPADC_TP_CTRL1_TP_ADC_SELECT,
+	.adc_chan_select = &sun4i_gpadc_chan_select,
+};
+
+static const struct sunxi_gpadc_soc_specific sun5i_gpadc_soc_specific = {
+	.temp_offset = -1447,
+	.temp_scale = 100,
+	.tp_mode_en = SUNXI_GPADC_TP_CTRL1_TP_MODE_EN,
+	.tp_adc_select = SUNXI_GPADC_TP_CTRL1_TP_ADC_SELECT,
+	.adc_chan_select = &sun4i_gpadc_chan_select,
+};
+
+static const struct sunxi_gpadc_soc_specific sun6i_gpadc_soc_specific = {
+	.temp_offset = -1623,
+	.temp_scale = 167,
+	.tp_mode_en = SUNXI_GPADC_TP_CTRL1_SUN6I_TP_MODE_EN,
+	.tp_adc_select = SUNXI_GPADC_TP_CTRL1_SUN6I_TP_ADC_SELECT,
+	.adc_chan_select = &sun6i_gpadc_chan_select,
+};
+
+struct sunxi_gpadc_dev {
+	struct iio_dev				*indio_dev;
+	void __iomem				*regs;
+	struct completion			completion;
+	int					temp_data;
+	u32					adc_data;
+	struct regmap				*regmap;
+	unsigned int				fifo_data_irq;
+	atomic_t				ignore_fifo_data_irq;
+	unsigned int				temp_data_irq;
+	atomic_t				ignore_temp_data_irq;
+	const struct sunxi_gpadc_soc_specific	*soc_specific;
+	struct mutex				mutex;
+};
+
+#define SUNXI_GPADC_ADC_CHANNEL(_channel, _name) {		\
+	.type = IIO_VOLTAGE,					\
+	.indexed = 1,						\
+	.channel = _channel,					\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+	.datasheet_name = _name,				\
+}
+
+static struct iio_map sunxi_gpadc_hwmon_maps[] = {
+	{
+		.adc_channel_label = "temp_adc",
+		.consumer_dev_name = "iio_hwmon.0",
+	},
+	{ /* sentinel */ },
+};
+
+static const struct iio_chan_spec sunxi_gpadc_channels[] = {
+	SUNXI_GPADC_ADC_CHANNEL(0, "adc_chan0"),
+	SUNXI_GPADC_ADC_CHANNEL(1, "adc_chan1"),
+	SUNXI_GPADC_ADC_CHANNEL(2, "adc_chan2"),
+	SUNXI_GPADC_ADC_CHANNEL(3, "adc_chan3"),
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_OFFSET),
+		.datasheet_name = "temp_adc",
+	},
+};
+
+static int sunxi_gpadc_adc_read(struct iio_dev *indio_dev, int channel,
+				int *val)
+{
+	struct sunxi_gpadc_dev *info = iio_priv(indio_dev);
+	int ret = 0;
+
+	pm_runtime_get_sync(indio_dev->dev.parent);
+	mutex_lock(&info->mutex);
+
+	reinit_completion(&info->completion);
+	regmap_write(info->regmap, SUNXI_GPADC_TP_CTRL1,
+		     info->soc_specific->tp_mode_en |
+		     info->soc_specific->tp_adc_select |
+		     info->soc_specific->adc_chan_select(channel));
+	regmap_write(info->regmap, SUNXI_GPADC_TP_INT_FIFOC,
+		     SUNXI_GPADC_TP_INT_FIFOC_TP_FIFO_TRIG_LEVEL(1) |
+		     SUNXI_GPADC_TP_INT_FIFOC_TP_FIFO_FLUSH);
+	enable_irq(info->fifo_data_irq);
+
+	if (!wait_for_completion_timeout(&info->completion,
+					 msecs_to_jiffies(100))) {
+		ret = -ETIMEDOUT;
+		goto out;
+	}
+
+	*val = info->adc_data;
+
+out:
+	disable_irq(info->fifo_data_irq);
+	mutex_unlock(&info->mutex);
+	pm_runtime_mark_last_busy(indio_dev->dev.parent);
+	pm_runtime_put_autosuspend(indio_dev->dev.parent);
+
+	return ret;
+}
+
+static int sunxi_gpadc_temp_read(struct iio_dev *indio_dev, int *val)
+{
+	struct sunxi_gpadc_dev *info = iio_priv(indio_dev);
+	int ret = 0;
+
+	pm_runtime_get_sync(indio_dev->dev.parent);
+	mutex_lock(&info->mutex);
+
+	reinit_completion(&info->completion);
+
+	regmap_write(info->regmap, SUNXI_GPADC_TP_INT_FIFOC,
+		     SUNXI_GPADC_TP_INT_FIFOC_TP_FIFO_TRIG_LEVEL(1) |
+		     SUNXI_GPADC_TP_INT_FIFOC_TP_FIFO_FLUSH);
+	/*
+	 * The temperature sensor returns valid data only when the ADC operates
+	 * in touchscreen mode.
+	 */
+	regmap_write(info->regmap, SUNXI_GPADC_TP_CTRL1,
+		     info->soc_specific->tp_mode_en);
+	enable_irq(info->temp_data_irq);
+
+	if (!wait_for_completion_timeout(&info->completion,
+					 msecs_to_jiffies(100))) {
+		ret = -ETIMEDOUT;
+		goto out;
+	}
+
+	*val = info->temp_data;
+
+out:
+	disable_irq(info->temp_data_irq);
+	mutex_unlock(&info->mutex);
+	pm_runtime_mark_last_busy(indio_dev->dev.parent);
+	pm_runtime_put_autosuspend(indio_dev->dev.parent);
+
+	return ret;
+}
+
+static int sunxi_gpadc_temp_offset(struct iio_dev *indio_dev, int *val)
+{
+	struct sunxi_gpadc_dev *info = iio_priv(indio_dev);
+
+	*val = info->soc_specific->temp_offset;
+
+	return 0;
+}
+
+static int sunxi_gpadc_temp_scale(struct iio_dev *indio_dev, int *val)
+{
+	struct sunxi_gpadc_dev *info = iio_priv(indio_dev);
+
+	*val = info->soc_specific->temp_scale;
+
+	return 0;
+}
+
+static int sunxi_gpadc_read_raw(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *chan, int *val,
+				int *val2, long mask)
+{
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_OFFSET:
+		ret = sunxi_gpadc_temp_offset(indio_dev, val);
+		if (ret)
+			return ret;
+
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_RAW:
+		if (chan->type == IIO_VOLTAGE) {
+			ret = sunxi_gpadc_adc_read(indio_dev, chan->channel,
+						   val);
+			if (ret)
+				return ret;
+		} else {
+			ret = sunxi_gpadc_temp_read(indio_dev, val);
+			if (ret)
+				return ret;
+		}
+
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		ret = sunxi_gpadc_temp_scale(indio_dev, val);
+		if (ret)
+			return ret;
+
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+
+	return -EINVAL;
+}
+
+static const struct iio_info sunxi_gpadc_iio_info = {
+	.read_raw = sunxi_gpadc_read_raw,
+	.driver_module = THIS_MODULE,
+};
+
+static irqreturn_t sunxi_gpadc_temp_data_irq_handler(int irq, void *dev_id)
+{
+	struct sunxi_gpadc_dev *info = dev_id;
+
+	if (atomic_read(&info->ignore_temp_data_irq))
+		return IRQ_HANDLED;
+
+	if (!regmap_read(info->regmap, SUNXI_GPADC_TEMP_DATA, &info->temp_data))
+		complete(&info->completion);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t sunxi_gpadc_fifo_data_irq_handler(int irq, void *dev_id)
+{
+	struct sunxi_gpadc_dev *info = dev_id;
+
+	if (atomic_read(&info->ignore_fifo_data_irq))
+		return IRQ_HANDLED;
+
+	if (!regmap_read(info->regmap, SUNXI_GPADC_TP_DATA, &info->adc_data))
+		complete(&info->completion);
+
+	return IRQ_HANDLED;
+}
+
+static int sunxi_gpadc_runtime_suspend(struct device *dev)
+{
+	struct sunxi_gpadc_dev *info = iio_priv(dev_get_drvdata(dev));
+
+	mutex_lock(&info->mutex);
+
+	/* Disable the ADC on IP */
+	regmap_write(info->regmap, SUNXI_GPADC_TP_CTRL1, 0);
+	/* Disable temperature sensor on IP */
+	regmap_write(info->regmap, SUNXI_GPADC_TP_TPR, 0);
+
+	mutex_unlock(&info->mutex);
+
+	return 0;
+}
+
+static int sunxi_gpadc_runtime_resume(struct device *dev)
+{
+	struct sunxi_gpadc_dev *info = iio_priv(dev_get_drvdata(dev));
+
+	mutex_lock(&info->mutex);
+
+	/* clkin = 6MHz */
+	regmap_write(info->regmap, SUNXI_GPADC_TP_CTRL0,
+		     SUNXI_GPADC_TP_CTRL0_ADC_CLK_DIVIDER(2) |
+		     SUNXI_GPADC_TP_CTRL0_FS_DIV(7) |
+		     SUNXI_GPADC_TP_CTRL0_T_ACQ(63));
+	regmap_write(info->regmap, SUNXI_GPADC_TP_CTRL1,
+		     info->soc_specific->tp_mode_en);
+	regmap_write(info->regmap, SUNXI_GPADC_TP_CTRL3,
+		     SUNXI_GPADC_TP_CTRL3_FILTER_EN |
+		     SUNXI_GPADC_TP_CTRL3_FILTER_TYPE(1));
+	/* period = SUNXI_GPADC_TP_TPR_TEMP_PERIOD * 256 * 16 / clkin; ~1.3s */
+	regmap_write(info->regmap, SUNXI_GPADC_TP_TPR,
+		     SUNXI_GPADC_TP_TPR_TEMP_ENABLE |
+		     SUNXI_GPADC_TP_TPR_TEMP_PERIOD(1953));
+
+	mutex_unlock(&info->mutex);
+
+	return 0;
+}
+
+static int sunxi_gpadc_get_temp(void *data, int *temp)
+{
+	struct sunxi_gpadc_dev *info = (struct sunxi_gpadc_dev *)data;
+	int val, scale, offset;
+
+	/* If reading temperature times out, take stored previous value. */
+	if (sunxi_gpadc_temp_read(info->indio_dev, &val))
+		val = info->temp_data;
+	sunxi_gpadc_temp_scale(info->indio_dev, &scale);
+	sunxi_gpadc_temp_offset(info->indio_dev, &offset);
+
+	*temp = (val + offset) * scale;
+
+	return 0;
+}
+
+static const struct thermal_zone_of_device_ops sunxi_ts_tz_ops = {
+	.get_temp = &sunxi_gpadc_get_temp,
+};
+
+static const struct dev_pm_ops sunxi_gpadc_pm_ops = {
+	.runtime_suspend = &sunxi_gpadc_runtime_suspend,
+	.runtime_resume = &sunxi_gpadc_runtime_resume,
+};
+
+static int sunxi_gpadc_probe(struct platform_device *pdev)
+{
+	struct sunxi_gpadc_dev *info;
+	struct iio_dev *indio_dev;
+	int ret, irq;
+	struct sunxi_gpadc_mfd_dev *sunxi_gpadc_mfd_dev;
+	struct thermal_zone_device *tzd;
+
+	sunxi_gpadc_mfd_dev = dev_get_drvdata(pdev->dev.parent);
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	info = iio_priv(indio_dev);
+
+	mutex_init(&info->mutex);
+	info->regmap = sunxi_gpadc_mfd_dev->regmap;
+	info->indio_dev = indio_dev;
+	atomic_set(&info->ignore_fifo_data_irq, 1);
+	atomic_set(&info->ignore_temp_data_irq, 1);
+	init_completion(&info->completion);
+	indio_dev->name = dev_name(&pdev->dev);
+	indio_dev->dev.parent = &pdev->dev;
+	indio_dev->dev.of_node = pdev->dev.of_node;
+	indio_dev->info = &sunxi_gpadc_iio_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->num_channels = ARRAY_SIZE(sunxi_gpadc_channels);
+	indio_dev->channels = sunxi_gpadc_channels;
+
+	info->soc_specific = (struct sunxi_gpadc_soc_specific *)platform_get_device_id(pdev)->driver_data;
+
+	tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, info,
+						   &sunxi_ts_tz_ops);
+	if (IS_ERR(tzd)) {
+		dev_err(&pdev->dev, "could not register thermal sensor: %ld\n",
+			PTR_ERR(tzd));
+		return PTR_ERR(tzd);
+	}
+
+	pm_runtime_set_autosuspend_delay(&pdev->dev,
+					 SUNXI_GPADC_AUTOSUSPEND_DELAY);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+	irq = platform_get_irq_byname(pdev, "TEMP_DATA_PENDING");
+	if (irq < 0) {
+		dev_err(&pdev->dev,
+			"no TEMP_DATA_PENDING interrupt registered\n");
+		ret = irq;
+		goto err;
+	}
+
+	irq = regmap_irq_get_virq(sunxi_gpadc_mfd_dev->regmap_irqc, irq);
+	ret = devm_request_any_context_irq(&pdev->dev, irq,
+					   sunxi_gpadc_temp_data_irq_handler, 0,
+					   "temp_data", info);
+	if (ret < 0) {
+		dev_err(&pdev->dev,
+			"could not request TEMP_DATA_PENDING interrupt: %d\n",
+			ret);
+		goto err;
+	}
+
+	disable_irq(irq);
+	info->temp_data_irq = irq;
+	atomic_set(&info->ignore_temp_data_irq, 0);
+
+	irq = platform_get_irq_byname(pdev, "FIFO_DATA_PENDING");
+	if (irq < 0) {
+		dev_err(&pdev->dev,
+			"no FIFO_DATA_PENDING interrupt registered\n");
+		ret = irq;
+		goto err;
+	}
+
+	irq = regmap_irq_get_virq(sunxi_gpadc_mfd_dev->regmap_irqc, irq);
+	ret = devm_request_any_context_irq(&pdev->dev, irq,
+					   sunxi_gpadc_fifo_data_irq_handler, 0,
+					   "fifo_data", info);
+	if (ret < 0) {
+		dev_err(&pdev->dev,
+			"could not request FIFO_DATA_PENDING interrupt: %d\n",
+			ret);
+		goto err;
+	}
+
+	disable_irq(irq);
+	info->fifo_data_irq = irq;
+	atomic_set(&info->ignore_fifo_data_irq, 0);
+
+	ret = iio_map_array_register(indio_dev, sunxi_gpadc_hwmon_maps);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to register iio map array\n");
+		goto err;
+	}
+
+	platform_set_drvdata(pdev, indio_dev);
+
+	ret = iio_device_register(indio_dev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "could not register the device\n");
+		goto err_map;
+	}
+
+	return 0;
+
+err_map:
+	iio_map_array_unregister(indio_dev);
+
+err:
+	pm_runtime_put(&pdev->dev);
+	/* Disable all hardware interrupts */
+	regmap_write(info->regmap, SUNXI_GPADC_TP_INT_FIFOC, 0);
+
+	return ret;
+}
+
+static int sunxi_gpadc_remove(struct platform_device *pdev)
+{
+	struct sunxi_gpadc_dev *info;
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+
+	info = iio_priv(indio_dev);
+	iio_device_unregister(indio_dev);
+	iio_map_array_unregister(indio_dev);
+	pm_runtime_put(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	/* Disable all hardware interrupts */
+	regmap_write(info->regmap, SUNXI_GPADC_TP_INT_FIFOC, 0);
+
+	return 0;
+}
+
+static const struct platform_device_id sunxi_gpadc_id[] = {
+	{ "sun4i-a10-gpadc-iio", (kernel_ulong_t)&sun4i_gpadc_soc_specific },
+	{ "sun5i-a13-gpadc-iio", (kernel_ulong_t)&sun5i_gpadc_soc_specific },
+	{ "sun6i-a31-gpadc-iio", (kernel_ulong_t)&sun6i_gpadc_soc_specific },
+	{ /* sentinel */ },
+};
+
+static struct platform_driver sunxi_gpadc_driver = {
+	.driver = {
+		.name = "sunxi-gpadc-iio",
+		.pm = &sunxi_gpadc_pm_ops,
+	},
+	.id_table = sunxi_gpadc_id,
+	.probe = sunxi_gpadc_probe,
+	.remove = sunxi_gpadc_remove,
+};
+
+module_platform_driver(sunxi_gpadc_driver);
+
+MODULE_DESCRIPTION("ADC driver for sunxi platforms");
+MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
+MODULE_LICENSE("GPL v2");
