Merge tag 'iio-5.7a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

First set of new IIO device support, fatures and cleanups for the 5.7 cycle

Includes changes for the counter subsystem

Core Feature
* Explicitly handle sysfs values in dB, including correctly handling the
  needed postfix dB.
* Add a TODO to suggest suitable activities for new contributors to IIO now
  the vast majority of drivers are out of staging (and the remaining ones
  there are 'hard'). Also update the TODO in staging to remove stale entries.

Staging graduations
* ad7192 ADC.

New device support
* ad5770r
  - New driver for this 6 channel DAC including DT bindings.
* ad8366
  - Add supprot for the hmc1119 attenuator.
* al3010
  - New driver supporting this Dyna-image light sensors.
  - Power management and DT bindings added in additional patches.
* atlas-sensor
  - Add support for atlas DO-SM device.  Reads disolved oxygen in a solution.
* gpap002x00f
  - New driver and bindings to support the GP2AP002A00F and GP2AP002S00F light
    and proximity sensors. There is some limited existing support in
    input.  The intent is to drop this driver once IIO driver is in place.
* hmc425a
  - New driver for this attenuator.
* icp10100
  - New driver for this presure sensor.
* ltc2632
  - Add support for the ltc2636 8 channel DAC. Includes bindings and some
    tidying up of the driver.
* inv_mpu6050
  - Support IAM20680, ICM20609, ICM20689 and ICM20690.
    Includes related tidy up and rework of low pass filter bandwidth
    handling to give suitable values for all chips.

Binding conversions to yaml or missing bindings docs.
* atlas-sensor, including consolidation of previous 3 separate docs into 1.
* ad7923, previously no doc.
* max1363, split into max1238 and max1363 to simplify yaml.
* stm32-adc

Features
* (counter) 104-quad-8
  - Support a filter clock prescaler.
  - Support reporting of encoder cable status.
* ad7124
  - Low pass filter support.
  - Debugfs interface to access registers directly.
* ad8366
  - Support control of hardware gain.
* inv_mpu6050
  - Runtime pm with autosuspend.
* npcm adc
  - Add reset support. This is a breaking change if DT is not in sync,
    however this device is a BMC so the ecosystem is closed enought that
    this should not be a problem.
* srf04
  - Add power management with DT bindings for the GPIO.
* stm32-timer-trigger
  - Power management.
* (counter) stm32-timer-cnt
  - Power management.
* vcnl4000
  - Enable runtime PM for devices that don't use on demand measurement.

Cleanups and minor fixes
* core
  - Avoid double read when using debugfs.  Whilst we provide no guarantees
    on lack of side effects using the debugfs interfaces, this one is
    generate unexpected results so let us tidy it up.
* dac/Kconfig
  - Alphabetic order.
* ad5755
  - Grammar and minor other fixes.
* ad7124
  - Fail probe if get_voltage fails as no meaningful readings can be had
    without knowing the external reference.
  - Switch to selection between different channel attributes rather than
    building the arrays at runtime.
  - Remove the spi_device_id table as the driver cannot be probled without
    more information that can be provided without dt.
  - Update sysfs docs to provide more inormation and bring remaining docs for
    this part out of staging.
* ad9292
  - Use new SPI transfer delay structure.
* adis library
  - Add unlocked version of adis_initial_startup and refactor the function.
  - Add a product ID santiy check.
  - Add support for different self test registers.
  - Use new SPI delay structure.
  - Add new docs and tidy up existing.
* adis16136
  - Initialize adis_data statically.
* adis16400
  - Initialize adis_data statically.
* adis16460
  - Use core __adis_initial_Startup now it supports everything needed.
* adis16480
  - Initialize adis_data statically.
  - Use core __adis_initial_startup now it supports everything needed.
* al3320a
  - Add missing DT binding docs.
  - Tidy up code formatting.
  - Simplify error paths using devm_add_action_or_reset.
  - Ensure autoloading works by adding the of_match_table.
* atlas-sensor
  - Drop false requirement for interrupt line, the value can be polled using
    a sysfs or hrtimer type trigger.
* exynos-adc
  - Silence warning message on deferring probe.
* gp2ap002
  - Greatly simplify the Lux LUT.
  - Reorder actions around buffer setup and tear down as part of a sub-system
    wide standardization of these.
* inv_mpu6050
  - Various lttle tidyups.
  - Simpliy I2C aux MUX handling by enabling it only at startup. It never
    needs to be disabled.
  - Simplify polling rate when magnetometer enabled by putting only under
    control of userspace.
  - Always execute full reset on devices supporting spi. It does no harm
    when using i2c and makes for simpler code.
  - Reduce over the top sleep times for vddio regulator power up.
  - Greatly simplify power and engine management.
  - Fix some delays in polled reads (only visible due to other changes)
  - Stop preventing sampling rate changes whilst running as there is no
    adverse consequence of doing so.
  - Prevent attempting to read the temperature if neither accel nor
    gyro is enabled.
* lmp9100
  - Reorder actions around buffer setup and tear down as part of a sub-system
    wide standardization of these.
* max1118
  - Use new SPI transfer delay structure.
* mcp320x
  - Use new SPI transfer delay structure.
* si1133
  - Read full 24 bit signed integer instead o dropping last 8 bits of value.
    Not a critical fix as just adds precision.
* st_sensors
  - Use st_sensors_dev_name_probe instead of open coded version in st_accel
  - Handle potential memory allocation failure.
* st_lsm6dsx
  - Fix some wrong structure element naming in documentation.
  - Add missing return value check.
* stm32_timer_cnt
  - Drop some unused left over IIO headers from this count subsystem driver.
  - Ensure the clock is enabled in master mode.  Theoretical issue rather
    than one known to happen in the wild.
* tlc4541
  - Use new SPI delay structure.

* tag 'iio-5.7a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio: (98 commits)
  iio: dac: Kconfig: sort symbols alphabetically
  iio: light: gp2ap020a00f: fix iio_triggered_buffer_{predisable,postenable} positions
  iio: potentiostat: lmp9100: fix iio_triggered_buffer_{predisable,postenable} positions
  iio: trigger: stm32-timer: add power management support
  iio: trigger: stm32-timer: rename enabled flag
  iio: add a TODO
  counter: 104-quad-8: Support Differential Encoder Cable Status
  counter: 104-quad-8: Support Filter Clock Prescaler
  iio: pressure: icp10100: add driver for InvenSense ICP-101xx
  iio: industrialio-core: Fix debugfs read
  iio: imu: adis: add a note better explaining state_lock
  iio: imu: adis: update 'adis_data' struct doc-string
  iio: imu: adis: add doc-string for 'adis' struct
  iio: imu: adis_buffer: Use new structure for SPI transfer delays
  iio: adc: ti-tlc4541: Use new structure for SPI transfer delays
  iio: adc: mcp320x: Use new structure for SPI transfer delays
  iio: adc: max1118: Use new structure for SPI transfer delays
  iio: adc: ad9292: Use new structure for SPI transfer delays
  iio: adc: exynos: Silence warning about regulators during deferred probe
  staging: iio: update TODO
  ...

1 files changed, 695 insertions, 0 deletions

diff --git a/drivers/iio/dac/ad5770r.c b/drivers/iio/dac/ad5770r.c
new file mode 100644
index 000000000000..a98ea76732e7
--- /dev/null
+++ b/drivers/iio/dac/ad5770r.c
@@ -0,0 +1,695 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AD5770R Digital to analog converters driver
+ *
+ * Copyright 2018 Analog Devices Inc.
+ */
+
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#define ADI_SPI_IF_CONFIG_A		0x00
+#define ADI_SPI_IF_CONFIG_B		0x01
+#define ADI_SPI_IF_DEVICE_CONFIG	0x02
+#define ADI_SPI_IF_CHIP_TYPE		0x03
+#define ADI_SPI_IF_PRODUCT_ID_L		0x04
+#define ADI_SPI_IF_PRODUCT_ID_H		0x05
+#define ADI_SPI_IF_CHIP_GRADE		0x06
+#define ADI_SPI_IF_SCRACTH_PAD		0x0A
+#define ADI_SPI_IF_SPI_REVISION		0x0B
+#define ADI_SPI_IF_SPI_VENDOR_L		0x0C
+#define ADI_SPI_IF_SPI_VENDOR_H		0x0D
+#define ADI_SPI_IF_SPI_STREAM_MODE	0x0E
+#define ADI_SPI_IF_CONFIG_C		0x10
+#define ADI_SPI_IF_STATUS_A		0x11
+
+/* ADI_SPI_IF_CONFIG_A */
+#define ADI_SPI_IF_SW_RESET_MSK		(BIT(0) | BIT(7))
+#define ADI_SPI_IF_SW_RESET_SEL(x)	((x) & ADI_SPI_IF_SW_RESET_MSK)
+#define ADI_SPI_IF_ADDR_ASC_MSK		(BIT(2) | BIT(5))
+#define ADI_SPI_IF_ADDR_ASC_SEL(x)	(((x) << 2) & ADI_SPI_IF_ADDR_ASC_MSK)
+
+/* ADI_SPI_IF_CONFIG_B */
+#define ADI_SPI_IF_SINGLE_INS_MSK	BIT(7)
+#define ADI_SPI_IF_SINGLE_INS_SEL(x)	FIELD_PREP(ADI_SPI_IF_SINGLE_INS_MSK, x)
+#define ADI_SPI_IF_SHORT_INS_MSK	BIT(7)
+#define ADI_SPI_IF_SHORT_INS_SEL(x)	FIELD_PREP(ADI_SPI_IF_SINGLE_INS_MSK, x)
+
+/* ADI_SPI_IF_CONFIG_C */
+#define ADI_SPI_IF_STRICT_REG_MSK	BIT(5)
+#define ADI_SPI_IF_STRICT_REG_GET(x)	FIELD_GET(ADI_SPI_IF_STRICT_REG_MSK, x)
+
+/* AD5770R configuration registers */
+#define AD5770R_CHANNEL_CONFIG		0x14
+#define AD5770R_OUTPUT_RANGE(ch)	(0x15 + (ch))
+#define AD5770R_FILTER_RESISTOR(ch)	(0x1D + (ch))
+#define AD5770R_REFERENCE		0x1B
+#define AD5770R_DAC_LSB(ch)		(0x26 + 2 * (ch))
+#define AD5770R_DAC_MSB(ch)		(0x27 + 2 * (ch))
+#define AD5770R_CH_SELECT		0x34
+#define AD5770R_CH_ENABLE		0x44
+
+/* AD5770R_CHANNEL_CONFIG */
+#define AD5770R_CFG_CH0_SINK_EN(x)		(((x) & 0x1) << 7)
+#define AD5770R_CFG_SHUTDOWN_B(x, ch)		(((x) & 0x1) << (ch))
+
+/* AD5770R_OUTPUT_RANGE */
+#define AD5770R_RANGE_OUTPUT_SCALING(x)		(((x) & GENMASK(5, 0)) << 2)
+#define AD5770R_RANGE_MODE(x)			((x) & GENMASK(1, 0))
+
+/* AD5770R_REFERENCE */
+#define AD5770R_REF_RESISTOR_SEL(x)		(((x) & 0x1) << 2)
+#define AD5770R_REF_SEL(x)			((x) & GENMASK(1, 0))
+
+/* AD5770R_CH_ENABLE */
+#define AD5770R_CH_SET(x, ch)		(((x) & 0x1) << (ch))
+
+#define AD5770R_MAX_CHANNELS	6
+#define AD5770R_MAX_CH_MODES	14
+#define AD5770R_LOW_VREF_mV	1250
+#define AD5770R_HIGH_VREF_mV	2500
+
+enum ad5770r_ch0_modes {
+	AD5770R_CH0_0_300 = 0,
+	AD5770R_CH0_NEG_60_0,
+	AD5770R_CH0_NEG_60_300
+};
+
+enum ad5770r_ch1_modes {
+	AD5770R_CH1_0_140_LOW_HEAD = 1,
+	AD5770R_CH1_0_140_LOW_NOISE,
+	AD5770R_CH1_0_250
+};
+
+enum ad5770r_ch2_5_modes {
+	AD5770R_CH_LOW_RANGE = 0,
+	AD5770R_CH_HIGH_RANGE
+};
+
+enum ad5770r_ref_v {
+	AD5770R_EXT_2_5_V = 0,
+	AD5770R_INT_1_25_V_OUT_ON,
+	AD5770R_EXT_1_25_V,
+	AD5770R_INT_1_25_V_OUT_OFF
+};
+
+enum ad5770r_output_filter_resistor {
+	AD5770R_FILTER_60_OHM = 0x0,
+	AD5770R_FILTER_5_6_KOHM = 0x5,
+	AD5770R_FILTER_11_2_KOHM,
+	AD5770R_FILTER_22_2_KOHM,
+	AD5770R_FILTER_44_4_KOHM,
+	AD5770R_FILTER_104_KOHM,
+};
+
+struct ad5770r_out_range {
+	u8	out_scale;
+	u8	out_range_mode;
+};
+
+/**
+ * struct ad5770R_state - driver instance specific data
+ * @spi:		spi_device
+ * @regmap:		regmap
+ * @vref_reg:		fixed regulator for reference configuration
+ * @gpio_reset:		gpio descriptor
+ * @output_mode:	array contains channels output ranges
+ * @vref:		reference value
+ * @ch_pwr_down:	powerdown flags
+ * @internal_ref:	internal reference flag
+ * @external_res:	external 2.5k resistor flag
+ * @transf_buf:		cache aligned buffer for spi read/write
+ */
+struct ad5770r_state {
+	struct spi_device		*spi;
+	struct regmap			*regmap;
+	struct regulator		*vref_reg;
+	struct gpio_desc		*gpio_reset;
+	struct ad5770r_out_range	output_mode[AD5770R_MAX_CHANNELS];
+	int				vref;
+	bool				ch_pwr_down[AD5770R_MAX_CHANNELS];
+	bool				internal_ref;
+	bool				external_res;
+	u8				transf_buf[2] ____cacheline_aligned;
+};
+
+static const struct regmap_config ad5770r_spi_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.read_flag_mask = BIT(7),
+};
+
+struct ad5770r_output_modes {
+	unsigned int ch;
+	u8 mode;
+	int min;
+	int max;
+};
+
+static struct ad5770r_output_modes ad5770r_rng_tbl[] = {
+	{ 0, AD5770R_CH0_0_300, 0, 300 },
+	{ 0, AD5770R_CH0_NEG_60_0, -60, 0 },
+	{ 0, AD5770R_CH0_NEG_60_300, -60, 300 },
+	{ 1, AD5770R_CH1_0_140_LOW_HEAD, 0, 140 },
+	{ 1, AD5770R_CH1_0_140_LOW_NOISE, 0, 140 },
+	{ 1, AD5770R_CH1_0_250, 0, 250 },
+	{ 2, AD5770R_CH_LOW_RANGE, 0, 55 },
+	{ 2, AD5770R_CH_HIGH_RANGE, 0, 150 },
+	{ 3, AD5770R_CH_LOW_RANGE, 0, 45 },
+	{ 3, AD5770R_CH_HIGH_RANGE, 0, 100 },
+	{ 4, AD5770R_CH_LOW_RANGE, 0, 45 },
+	{ 4, AD5770R_CH_HIGH_RANGE, 0, 100 },
+	{ 5, AD5770R_CH_LOW_RANGE, 0, 45 },
+	{ 5, AD5770R_CH_HIGH_RANGE, 0, 100 },
+};
+
+static const unsigned int ad5770r_filter_freqs[] = {
+	153, 357, 715, 1400, 2800, 262000,
+};
+
+static const unsigned int ad5770r_filter_reg_vals[] = {
+	AD5770R_FILTER_104_KOHM,
+	AD5770R_FILTER_44_4_KOHM,
+	AD5770R_FILTER_22_2_KOHM,
+	AD5770R_FILTER_11_2_KOHM,
+	AD5770R_FILTER_5_6_KOHM,
+	AD5770R_FILTER_60_OHM
+};
+
+static int ad5770r_set_output_mode(struct ad5770r_state *st,
+				   const struct ad5770r_out_range *out_mode,
+				   int channel)
+{
+	unsigned int regval;
+
+	regval = AD5770R_RANGE_OUTPUT_SCALING(out_mode->out_scale) |
+		 AD5770R_RANGE_MODE(out_mode->out_range_mode);
+
+	return regmap_write(st->regmap,
+			    AD5770R_OUTPUT_RANGE(channel), regval);
+}
+
+static int ad5770r_set_reference(struct ad5770r_state *st)
+{
+	unsigned int regval;
+
+	regval = AD5770R_REF_RESISTOR_SEL(st->external_res);
+
+	if (st->internal_ref) {
+		regval |= AD5770R_REF_SEL(AD5770R_INT_1_25_V_OUT_OFF);
+	} else {
+		switch (st->vref) {
+		case AD5770R_LOW_VREF_mV:
+			regval |= AD5770R_REF_SEL(AD5770R_EXT_1_25_V);
+			break;
+		case AD5770R_HIGH_VREF_mV:
+			regval |= AD5770R_REF_SEL(AD5770R_EXT_2_5_V);
+			break;
+		default:
+			regval = AD5770R_REF_SEL(AD5770R_INT_1_25_V_OUT_OFF);
+			break;
+		}
+	}
+
+	return regmap_write(st->regmap, AD5770R_REFERENCE, regval);
+}
+
+static int ad5770r_soft_reset(struct ad5770r_state *st)
+{
+	return regmap_write(st->regmap, ADI_SPI_IF_CONFIG_A,
+			    ADI_SPI_IF_SW_RESET_SEL(1));
+}
+
+static int ad5770r_reset(struct ad5770r_state *st)
+{
+	/* Perform software reset if no GPIO provided */
+	if (!st->gpio_reset)
+		return ad5770r_soft_reset(st);
+
+	gpiod_set_value_cansleep(st->gpio_reset, 0);
+	usleep_range(10, 20);
+	gpiod_set_value_cansleep(st->gpio_reset, 1);
+
+	/* data must not be written during reset timeframe */
+	usleep_range(100, 200);
+
+	return 0;
+}
+
+static int ad5770r_get_range(struct ad5770r_state *st,
+			     int ch, int *min, int *max)
+{
+	int i;
+	u8 tbl_ch, tbl_mode, out_range;
+
+	out_range = st->output_mode[ch].out_range_mode;
+
+	for (i = 0; i < AD5770R_MAX_CH_MODES; i++) {
+		tbl_ch = ad5770r_rng_tbl[i].ch;
+		tbl_mode = ad5770r_rng_tbl[i].mode;
+		if (tbl_ch == ch && tbl_mode == out_range) {
+			*min = ad5770r_rng_tbl[i].min;
+			*max = ad5770r_rng_tbl[i].max;
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int ad5770r_get_filter_freq(struct iio_dev *indio_dev,
+				   const struct iio_chan_spec *chan, int *freq)
+{
+	struct ad5770r_state *st = iio_priv(indio_dev);
+	int ret;
+	unsigned int regval, i;
+
+	ret = regmap_read(st->regmap,
+			  AD5770R_FILTER_RESISTOR(chan->channel), &regval);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(ad5770r_filter_reg_vals); i++)
+		if (regval == ad5770r_filter_reg_vals[i])
+			break;
+	if (i == ARRAY_SIZE(ad5770r_filter_reg_vals))
+		return -EINVAL;
+
+	*freq = ad5770r_filter_freqs[i];
+
+	return IIO_VAL_INT;
+}
+
+static int ad5770r_set_filter_freq(struct iio_dev *indio_dev,
+				   const struct iio_chan_spec *chan,
+				   unsigned int freq)
+{
+	struct ad5770r_state *st = iio_priv(indio_dev);
+	unsigned int regval, i;
+
+	for (i = 0; i < ARRAY_SIZE(ad5770r_filter_freqs); i++)
+		if (ad5770r_filter_freqs[i] >= freq)
+			break;
+	if (i == ARRAY_SIZE(ad5770r_filter_freqs))
+		return -EINVAL;
+
+	regval = ad5770r_filter_reg_vals[i];
+
+	return regmap_write(st->regmap, AD5770R_FILTER_RESISTOR(chan->channel),
+			    regval);
+}
+
+static int ad5770r_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long info)
+{
+	struct ad5770r_state *st = iio_priv(indio_dev);
+	int max, min, ret;
+	u16 buf16;
+
+	switch (info) {
+	case IIO_CHAN_INFO_RAW:
+		ret = regmap_bulk_read(st->regmap,
+				       chan->address,
+				       st->transf_buf, 2);
+		if (ret)
+			return 0;
+
+		buf16 = st->transf_buf[0] + (st->transf_buf[1] << 8);
+		*val = buf16 >> 2;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		ret = ad5770r_get_range(st, chan->channel, &min, &max);
+		if (ret < 0)
+			return ret;
+		*val = max - min;
+		/* There is no sign bit. (negative current is mapped from 0)
+		 * (sourced/sinked) current = raw * scale + offset
+		 * where offset in case of CH0 can be negative.
+		 */
+		*val2 = 14;
+		return IIO_VAL_FRACTIONAL_LOG2;
+	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+		return ad5770r_get_filter_freq(indio_dev, chan, val);
+	case IIO_CHAN_INFO_OFFSET:
+		ret = ad5770r_get_range(st, chan->channel, &min, &max);
+		if (ret < 0)
+			return ret;
+		*val = min;
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ad5770r_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long info)
+{
+	struct ad5770r_state *st = iio_priv(indio_dev);
+
+	switch (info) {
+	case IIO_CHAN_INFO_RAW:
+		st->transf_buf[0] = ((u16)val >> 6);
+		st->transf_buf[1] = (val & GENMASK(5, 0)) << 2;
+		return regmap_bulk_write(st->regmap, chan->address,
+					 st->transf_buf, 2);
+	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+		return ad5770r_set_filter_freq(indio_dev, chan, val);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ad5770r_read_freq_avail(struct iio_dev *indio_dev,
+				   struct iio_chan_spec const *chan,
+				   const int **vals, int *type, int *length,
+				   long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+		*type = IIO_VAL_INT;
+		*vals = ad5770r_filter_freqs;
+		*length = ARRAY_SIZE(ad5770r_filter_freqs);
+		return IIO_AVAIL_LIST;
+	}
+
+	return -EINVAL;
+}
+
+static int ad5770r_reg_access(struct iio_dev *indio_dev,
+			      unsigned int reg,
+			      unsigned int writeval,
+			      unsigned int *readval)
+{
+	struct ad5770r_state *st = iio_priv(indio_dev);
+
+	if (readval)
+		return regmap_read(st->regmap, reg, readval);
+	else
+		return regmap_write(st->regmap, reg, writeval);
+}
+
+static const struct iio_info ad5770r_info = {
+	.read_raw = ad5770r_read_raw,
+	.write_raw = ad5770r_write_raw,
+	.read_avail = ad5770r_read_freq_avail,
+	.debugfs_reg_access = &ad5770r_reg_access,
+};
+
+static int ad5770r_store_output_range(struct ad5770r_state *st,
+				      int min, int max, int index)
+{
+	int i;
+
+	for (i = 0; i < AD5770R_MAX_CH_MODES; i++) {
+		if (ad5770r_rng_tbl[i].ch != index)
+			continue;
+		if (ad5770r_rng_tbl[i].min != min ||
+		    ad5770r_rng_tbl[i].max != max)
+			continue;
+		st->output_mode[index].out_range_mode = ad5770r_rng_tbl[i].mode;
+
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static ssize_t ad5770r_read_dac_powerdown(struct iio_dev *indio_dev,
+					  uintptr_t private,
+					  const struct iio_chan_spec *chan,
+					  char *buf)
+{
+	struct ad5770r_state *st = iio_priv(indio_dev);
+
+	return sprintf(buf, "%d\n", st->ch_pwr_down[chan->channel]);
+}
+
+static ssize_t ad5770r_write_dac_powerdown(struct iio_dev *indio_dev,
+					   uintptr_t private,
+					   const struct iio_chan_spec *chan,
+					   const char *buf, size_t len)
+{
+	struct ad5770r_state *st = iio_priv(indio_dev);
+	unsigned int regval;
+	unsigned int mask;
+	bool readin;
+	int ret;
+
+	ret = kstrtobool(buf, &readin);
+	if (ret)
+		return ret;
+
+	readin = !readin;
+
+	regval = AD5770R_CFG_SHUTDOWN_B(readin, chan->channel);
+	if (chan->channel == 0 &&
+	    st->output_mode[0].out_range_mode > AD5770R_CH0_0_300) {
+		regval |= AD5770R_CFG_CH0_SINK_EN(readin);
+		mask = BIT(chan->channel) + BIT(7);
+	} else {
+		mask = BIT(chan->channel);
+	}
+	ret = regmap_update_bits(st->regmap, AD5770R_CHANNEL_CONFIG, mask,
+				 regval);
+	if (ret)
+		return ret;
+
+	regval = AD5770R_CH_SET(readin, chan->channel);
+	ret = regmap_update_bits(st->regmap, AD5770R_CH_ENABLE,
+				 BIT(chan->channel), regval);
+	if (ret)
+		return ret;
+
+	st->ch_pwr_down[chan->channel] = !readin;
+
+	return len;
+}
+
+static const struct iio_chan_spec_ext_info ad5770r_ext_info[] = {
+	{
+		.name = "powerdown",
+		.read = ad5770r_read_dac_powerdown,
+		.write = ad5770r_write_dac_powerdown,
+		.shared = IIO_SEPARATE,
+	},
+	{ }
+};
+
+#define AD5770R_IDAC_CHANNEL(index, reg) {				\
+	.type = IIO_CURRENT,						\
+	.address = reg,							\
+	.indexed = 1,							\
+	.channel = index,						\
+	.output = 1,							\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |			\
+		BIT(IIO_CHAN_INFO_SCALE) |				\
+		BIT(IIO_CHAN_INFO_OFFSET) |				\
+		BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),	\
+	.info_mask_shared_by_type_available =				\
+		BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),	\
+	.ext_info = ad5770r_ext_info,					\
+}
+
+static const struct iio_chan_spec ad5770r_channels[] = {
+	AD5770R_IDAC_CHANNEL(0, AD5770R_DAC_MSB(0)),
+	AD5770R_IDAC_CHANNEL(1, AD5770R_DAC_MSB(1)),
+	AD5770R_IDAC_CHANNEL(2, AD5770R_DAC_MSB(2)),
+	AD5770R_IDAC_CHANNEL(3, AD5770R_DAC_MSB(3)),
+	AD5770R_IDAC_CHANNEL(4, AD5770R_DAC_MSB(4)),
+	AD5770R_IDAC_CHANNEL(5, AD5770R_DAC_MSB(5)),
+};
+
+static int ad5770r_channel_config(struct ad5770r_state *st)
+{
+	int ret, tmp[2], min, max;
+	unsigned int num;
+	struct fwnode_handle *child;
+
+	num = device_get_child_node_count(&st->spi->dev);
+	if (num != AD5770R_MAX_CHANNELS)
+		return -EINVAL;
+
+	device_for_each_child_node(&st->spi->dev, child) {
+		ret = fwnode_property_read_u32(child, "num", &num);
+		if (ret)
+			return ret;
+		if (num > AD5770R_MAX_CHANNELS)
+			return -EINVAL;
+
+		ret = fwnode_property_read_u32_array(child,
+						     "adi,range-microamp",
+						     tmp, 2);
+		if (ret)
+			return ret;
+
+		min = tmp[0] / 1000;
+		max = tmp[1] / 1000;
+		ret = ad5770r_store_output_range(st, min, max, num);
+		if (ret)
+			return ret;
+	}
+
+	return ret;
+}
+
+static int ad5770r_init(struct ad5770r_state *st)
+{
+	int ret, i;
+
+	st->gpio_reset = devm_gpiod_get_optional(&st->spi->dev, "reset",
+						 GPIOD_OUT_HIGH);
+	if (IS_ERR(st->gpio_reset))
+		return PTR_ERR(st->gpio_reset);
+
+	/* Perform a reset */
+	ret = ad5770r_reset(st);
+	if (ret)
+		return ret;
+
+	/* Set output range */
+	ret = ad5770r_channel_config(st);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < AD5770R_MAX_CHANNELS; i++) {
+		ret = ad5770r_set_output_mode(st,  &st->output_mode[i], i);
+		if (ret)
+			return ret;
+	}
+
+	st->external_res = fwnode_property_read_bool(st->spi->dev.fwnode,
+						     "adi,external-resistor");
+
+	ret = ad5770r_set_reference(st);
+	if (ret)
+		return ret;
+
+	/* Set outputs off */
+	ret = regmap_write(st->regmap, AD5770R_CHANNEL_CONFIG, 0x00);
+	if (ret)
+		return ret;
+
+	ret = regmap_write(st->regmap, AD5770R_CH_ENABLE, 0x00);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < AD5770R_MAX_CHANNELS; i++)
+		st->ch_pwr_down[i] = true;
+
+	return ret;
+}
+
+static void ad5770r_disable_regulator(void *data)
+{
+	struct ad5770r_state *st = data;
+
+	regulator_disable(st->vref_reg);
+}
+
+static int ad5770r_probe(struct spi_device *spi)
+{
+	struct ad5770r_state *st;
+	struct iio_dev *indio_dev;
+	struct regmap *regmap;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+	spi_set_drvdata(spi, indio_dev);
+
+	st->spi = spi;
+
+	regmap = devm_regmap_init_spi(spi, &ad5770r_spi_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
+			PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+	st->regmap = regmap;
+
+	st->vref_reg = devm_regulator_get_optional(&spi->dev, "vref");
+	if (!IS_ERR(st->vref_reg)) {
+		ret = regulator_enable(st->vref_reg);
+		if (ret) {
+			dev_err(&spi->dev,
+				"Failed to enable vref regulators: %d\n", ret);
+			return ret;
+		}
+
+		ret = devm_add_action_or_reset(&spi->dev,
+					       ad5770r_disable_regulator,
+					       st);
+		if (ret < 0)
+			return ret;
+
+		ret = regulator_get_voltage(st->vref_reg);
+		if (ret < 0)
+			return ret;
+
+		st->vref = ret / 1000;
+	} else {
+		if (PTR_ERR(st->vref_reg) == -ENODEV) {
+			st->vref = AD5770R_LOW_VREF_mV;
+			st->internal_ref = true;
+		} else {
+			return PTR_ERR(st->vref_reg);
+		}
+	}
+
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->name = spi_get_device_id(spi)->name;
+	indio_dev->info = &ad5770r_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = ad5770r_channels;
+	indio_dev->num_channels = ARRAY_SIZE(ad5770r_channels);
+
+	ret = ad5770r_init(st);
+	if (ret < 0) {
+		dev_err(&spi->dev, "AD5770R init failed\n");
+		return ret;
+	}
+
+	return devm_iio_device_register(&st->spi->dev, indio_dev);
+}
+
+static const struct of_device_id ad5770r_of_id[] = {
+	{ .compatible = "adi,ad5770r", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ad5770r_of_id);
+
+static const struct spi_device_id ad5770r_id[] = {
+	{ "ad5770r", 0 },
+	{},
+};
+MODULE_DEVICE_TABLE(spi, ad5770r_id);
+
+static struct spi_driver ad5770r_driver = {
+	.driver = {
+		.name = KBUILD_MODNAME,
+		.of_match_table = ad5770r_of_id,
+	},
+	.probe = ad5770r_probe,
+	.id_table = ad5770r_id,
+};
+
+module_spi_driver(ad5770r_driver);
+
+MODULE_AUTHOR("Mircea Caprioru <mircea.caprioru@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD5770R IDAC");
+MODULE_LICENSE("GPL v2");