[PATCH v2 0/4] Add support for AD5710R/AD5711R DAC

[PATCH v2 0/4] Add support for AD5710R/AD5711R DAC

[Kim Seer Paller]

The AD5710R (16-bit) and AD5711R (12-bit) are 8-channel, low-power,
configurable current/voltage output DACs with an on-chip 2.5V reference.
Each channel can be independently configured as a voltage output
(0V to VREF or 0V to 2xVREF) or a current output (0mA to 50mA).

This series adds support for these parts:
 - ABI documentation for the high_z powerdown mode and the current-output
   powerdown attributes
 - device tree bindings for the AD5710R/AD5711R
 - basic IIO DAC driver, supporting per-channel voltage/current output
   selection, per-channel powerdown, software or hardware (LDAC) DAC
   updates, optional output range doubling, internal or external
   reference, and hardware reset (with a software-reset fallback).

Datasheet:
https://www.analog.com/media/en/technical-documentation/data-sheets/ad5711r-ad5710r.pdf

Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com>
---
Changes in v2:
- Drop the standalone ad5710r driver and fold AD5710R/AD5711R support
  into the existing ad3530r driver.
- Add a preparatory patch parameterizing the DAC resolution in ad3530r
  so the 12-/16-bit AD5711R/AD5710R can reuse the raw/scale paths.
- ABI: drop the "high_z" powerdown mode, which is a synonym of the
  existing "three_state" and use "three_state" instead.
- Link to v1: https://patch.msgid.link/20260716-iio-ad5710r-upstream-v1-0-e848a4bb701f@analog.com

To: Jonathan Cameron <jic23@kernel.org>
To: David Lechner <dlechner@baylibre.com>
To: Nuno Sá <nuno.sa@analog.com>
To: Andy Shevchenko <andy@kernel.org>
To: Michael Hennerich <Michael.Hennerich@analog.com>
To: Kim Seer Paller <kimseer.paller@analog.com>
To: Rob Herring <robh@kernel.org>
To: Krzysztof Kozlowski <krzk+dt@kernel.org>
To: Conor Dooley <conor+dt@kernel.org>
Cc: linux-iio@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux@analog.com
Cc: devicetree@vger.kernel.org

---
Kim Seer Paller (4):
      iio: ABI: Add DAC current powerdown attributes and 15kohm_to_gnd mode
      dt-bindings: iio: dac: add adi,ad5710r.yaml
      iio: dac: ad3530r: parameterize DAC resolution
      iio: dac: ad3530r: add support for AD5710R/AD5711R

 Documentation/ABI/testing/sysfs-bus-iio            |   5 +
 .../devicetree/bindings/iio/dac/adi,ad5710r.yaml   | 143 ++++++++++
 MAINTAINERS                                        |   1 +
 drivers/iio/dac/Kconfig                            |   1 +
 drivers/iio/dac/ad3530r.c                          | 295 +++++++++++++++++++--
 5 files changed, 425 insertions(+), 20 deletions(-)
---
base-commit: 36c12dbda81c284d72f3c64689461647497b643b
change-id: 20260716-iio-ad5710r-upstream-e41c298614c6

Best regards,
--  
Kim Seer Paller <kimseer.paller@analog.com>

[PATCH v2 1/4] iio: ABI: Add DAC current powerdown attributes and 15kohm_to_gnd mode

[Kim Seer Paller]

Document the out_currentY_powerdown and out_currentY_powerdown_mode
attributes for current-output DAC channels, and add the 15kohm_to_gnd
powerdown mode.

Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com>
---
 Documentation/ABI/testing/sysfs-bus-iio | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 5cc2e82c4997..ed3dd189c108 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -759,6 +759,8 @@ What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_powerdown_mode
 What:		/sys/bus/iio/devices/iio:deviceX/out_voltage_powerdown_mode
 What:		/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_powerdown_mode
 What:		/sys/bus/iio/devices/iio:deviceX/out_altvoltage_powerdown_mode
+What:		/sys/bus/iio/devices/iio:deviceX/out_currentY_powerdown_mode
+What:		/sys/bus/iio/devices/iio:deviceX/out_current_powerdown_mode
 KernelVersion:	2.6.38
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -771,6 +773,7 @@ Description:
 		6kohm_to_gnd: connected to ground via a 6kOhm resistor,
 		7.7kohm_to_gnd: connected to ground via a 7.7kOhm resistor,
 		10kohm_to_gnd: connected to ground via a 10kOhm resistor,
+		15kohm_to_gnd: connected to ground via a 15kOhm resistor,
 		16kohm_to_gnd: connected to ground via a 16kOhm resistor,
 		20kohm_to_gnd: connected to ground via a 20kOhm resistor,
 		32kohm_to_gnd: connected to ground via a 32kOhm resistor,
@@ -799,6 +802,8 @@ What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_powerdown
 What:		/sys/bus/iio/devices/iio:deviceX/out_voltage_powerdown
 What:		/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_powerdown
 What:		/sys/bus/iio/devices/iio:deviceX/out_altvoltage_powerdown
+What:		/sys/bus/iio/devices/iio:deviceX/out_currentY_powerdown
+What:		/sys/bus/iio/devices/iio:deviceX/out_current_powerdown
 KernelVersion:	2.6.38
 Contact:	linux-iio@vger.kernel.org
 Description:

-- 
2.34.1

[PATCH v2 2/4] dt-bindings: iio: dac: add adi,ad5710r.yaml

[Kim Seer Paller]

Add device tree bindings for the Analog Devices AD5710R/AD5711R
8-channel 12-/16-bit Configurable IDAC/VDAC.

Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com>
---
 .../devicetree/bindings/iio/dac/adi,ad5710r.yaml   | 143 +++++++++++++++++++++
 MAINTAINERS                                        |   1 +
 2 files changed, 144 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad5710r.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ad5710r.yaml
new file mode 100644
index 000000000000..17c1bf009242
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/adi,ad5710r.yaml
@@ -0,0 +1,143 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/dac/adi,ad5710r.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD5710R/AD5711R 8-channel 12-/16-bit Configurable IDAC/VDAC
+
+maintainers:
+  - Kim Seer Paller <kimseer.paller@analog.com>
+
+description: |
+  The AD5710R (16-bit) and AD5711R (12-bit) are 8-channel, low-power,
+  configurable current/voltage output digital-to-analog converters (DACs) with
+  an on-chip 2.5V, 3ppm/°C reference. Each channel can be independently
+  configured as a voltage output (0V to VREF or 0V to 2xVREF) or a current
+  output (0mA to 50mA). These devices operate from a single 2.7V to 5.5V
+  supply and are guaranteed monotonic by design.
+  Datasheet can be found here:
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad5711r-ad5710r.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad5710r
+      - adi,ad5711r
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 20000000
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  vdd-supply:
+    description: Power Supply Input.
+
+  iovdd-supply:
+    description: Digital Power Supply Input.
+
+  io-channels:
+    description:
+      ADC channel used to monitor internal die temperature, output voltages, and
+      current of a selected channel via the MUXOUT pin.
+    maxItems: 1
+
+  ref-supply:
+    description:
+      Reference Input/Output. The voltage at the REF pin sets the full-scale
+      range of all channels. If not provided the internal reference is used and
+      also provided on the VREF pin.
+
+  reset-gpios:
+    description:
+      Active low signal that is falling edge sensitive. When it is deasserted,
+      the digital core initialization is performed and all DAC registers except
+      the Interface Configuration A register are reset to their default values.
+    maxItems: 1
+
+  ldac-gpios:
+    description:
+      LDAC pin to be used as a hardware trigger to update the DAC channels. If
+      not present, the DAC channels are updated by Software LDAC.
+    maxItems: 1
+
+  adi,range-double:
+    description:
+      Configure the output range for all channels. If the property is present,
+      the output will range from 0V to 2Vref. If the property is not present,
+      the output will range from 0V to Vref.
+    type: boolean
+
+patternProperties:
+  "^channel@[0-7]$":
+    $ref: /schemas/iio/dac/dac.yaml#
+    type: object
+    description:
+      Represents the external channels which are connected to the DAC.
+
+    properties:
+      reg:
+        description: Channel number
+        items:
+          minimum: 0
+          maximum: 7
+
+      adi,ch-func:
+        description:
+          Channel output type. Use CH_FUNC_VOLTAGE_OUTPUT for voltage
+          output or CH_FUNC_CURRENT_OUTPUT for current output.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [1, 2]
+
+    required:
+      - reg
+      - adi,ch-func
+
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+  - iovdd-supply
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/iio/addac/adi,ad74413r.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        dac@0 {
+            compatible = "adi,ad5710r";
+            reg = <0>;
+            spi-max-frequency = <1000000>;
+            vdd-supply = <&vdd>;
+            iovdd-supply = <&iovdd>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            channel@0 {
+                reg = <0>;
+                adi,ch-func = <CH_FUNC_VOLTAGE_OUTPUT>;
+            };
+
+            channel@1 {
+                reg = <1>;
+                adi,ch-func = <CH_FUNC_CURRENT_OUTPUT>;
+            };
+        };
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 7077ed7c9efe..f207125383f5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1444,6 +1444,7 @@ L:	linux-iio@vger.kernel.org
 S:	Supported
 W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/dac/adi,ad3530r.yaml
+F:	Documentation/devicetree/bindings/iio/dac/adi,ad5710r.yaml
 F:	drivers/iio/dac/ad3530r.c
 
 ANALOG DEVICES INC AD3552R DRIVER

-- 
2.34.1

[PATCH v2 3/4] iio: dac: ad3530r: parameterize DAC resolution

[Kim Seer Paller]

Add a per-chip resolution field and use it in the raw read/write and
scale paths instead of assuming 16 bits. Drop AD3530R_REG_VAL_MASK and
AD3530R_DAC_MAX_VAL, which hardcoded the 16-bit width and are now
unused.

Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com>
---
 drivers/iio/dac/ad3530r.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/dac/ad3530r.c b/drivers/iio/dac/ad3530r.c
index 06b7f280f61b..97483534f8c3 100644
--- a/drivers/iio/dac/ad3530r.c
+++ b/drivers/iio/dac/ad3530r.c
@@ -61,14 +61,12 @@
 #define AD3530R_SLD_TRIG_A			BIT(7)
 #define AD3530R_OUTPUT_CONTROL_RANGE		BIT(2)
 #define AD3530R_REFERENCE_CONTROL_SEL		BIT(0)
-#define AD3530R_REG_VAL_MASK			GENMASK(15, 0)
 #define AD3530R_OP_MODE_CHAN_MSK(chan)		(GENMASK(1, 0) << 2 * (chan))
 
 #define AD3530R_SW_RESET			(BIT(7) | BIT(0))
 #define AD3530R_INTERNAL_VREF_mV		2500
 #define AD3530R_LDAC_PULSE_US			100
 
-#define AD3530R_DAC_MAX_VAL			GENMASK(15, 0)
 #define AD3530R_CH_PER_REG			4
 #define AD3530R_CH_PER_BANK			8
 #define AD3531R_MAX_CHANNELS			4
@@ -99,6 +97,7 @@ struct ad3530r_chip_info {
 	unsigned int num_channels;
 	unsigned int num_banks;
 	unsigned int num_op_mode_regs;
+	unsigned int resolution;
 	bool internal_ref_support;
 };
 
@@ -310,7 +309,7 @@ static int ad3530r_dac_write(struct ad3530r_state *st, unsigned int chan,
 	int ret;
 
 	guard(mutex)(&st->lock);
-	st->buf = cpu_to_be16(val);
+	st->buf = cpu_to_be16(val << (16 - st->chip_info->resolution));
 
 	ret = regmap_bulk_write(st->regmap, st->chip_info->input_ch_reg(chan),
 				&st->buf, sizeof(st->buf));
@@ -340,12 +339,12 @@ static int ad3530r_read_raw(struct iio_dev *indio_dev,
 		if (ret)
 			return ret;
 
-		*val = FIELD_GET(AD3530R_REG_VAL_MASK, be16_to_cpu(st->buf));
+		*val = be16_to_cpu(st->buf) >> (16 - st->chip_info->resolution);
 
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		*val = st->vref_mV;
-		*val2 = 16;
+		*val2 = st->chip_info->resolution;
 
 		return IIO_VAL_FRACTIONAL_LOG2;
 	default:
@@ -361,7 +360,7 @@ static int ad3530r_write_raw(struct iio_dev *indio_dev,
 
 	switch (info) {
 	case IIO_CHAN_INFO_RAW:
-		if (val < 0 || val > AD3530R_DAC_MAX_VAL)
+		if (val < 0 || val > (1 << st->chip_info->resolution) - 1)
 			return -EINVAL;
 
 		return ad3530r_dac_write(st, chan->channel, val);
@@ -525,6 +524,7 @@ static const struct regmap_config ad3532r_regmap_config = {
 
 static const struct ad3530r_chip_info ad3530_chip = {
 	.name = "ad3530",
+	.resolution = 16,
 	.channels = ad3530r_channels,
 	.regmap_config = &ad3530r_regmap_config,
 	.num_channels = ARRAY_SIZE(ad3530r_channels),
@@ -541,6 +541,7 @@ static const struct ad3530r_chip_info ad3530_chip = {
 
 static const struct ad3530r_chip_info ad3530r_chip = {
 	.name = "ad3530r",
+	.resolution = 16,
 	.channels = ad3530r_channels,
 	.regmap_config = &ad3530r_regmap_config,
 	.num_channels = ARRAY_SIZE(ad3530r_channels),
@@ -557,6 +558,7 @@ static const struct ad3530r_chip_info ad3530r_chip = {
 
 static const struct ad3530r_chip_info ad3531_chip = {
 	.name = "ad3531",
+	.resolution = 16,
 	.channels = ad3531r_channels,
 	.regmap_config = &ad3530r_regmap_config,
 	.num_channels = ARRAY_SIZE(ad3531r_channels),
@@ -573,6 +575,7 @@ static const struct ad3530r_chip_info ad3531_chip = {
 
 static const struct ad3530r_chip_info ad3531r_chip = {
 	.name = "ad3531r",
+	.resolution = 16,
 	.channels = ad3531r_channels,
 	.regmap_config = &ad3530r_regmap_config,
 	.num_channels = ARRAY_SIZE(ad3531r_channels),
@@ -589,6 +592,7 @@ static const struct ad3530r_chip_info ad3531r_chip = {
 
 static const struct ad3530r_chip_info ad3532_chip = {
 	.name = "ad3532",
+	.resolution = 16,
 	.channels = ad3532r_channels,
 	.regmap_config = &ad3532r_regmap_config,
 	.num_channels = ARRAY_SIZE(ad3532r_channels),
@@ -605,6 +609,7 @@ static const struct ad3530r_chip_info ad3532_chip = {
 
 static const struct ad3530r_chip_info ad3532r_chip = {
 	.name = "ad3532r",
+	.resolution = 16,
 	.channels = ad3532r_channels,
 	.regmap_config = &ad3532r_regmap_config,
 	.num_channels = ARRAY_SIZE(ad3532r_channels),

-- 
2.34.1

[PATCH v2 4/4] iio: dac: ad3530r: add support for AD5710R/AD5711R

[Kim Seer Paller]

Add support for the AD5710R/AD5711R, 8-channel 16-/12-bit configurable
IDAC/VDAC parts. They share the AD3530R register map and access model,
so fold them into this driver.

Each channel is configured as voltage or current output from its DT
channel@N node via adi,ch-func, building the iio_chan_spec dynamically.
Voltage channels enable VMODE_EN and report the reference-derived scale,
current channels report the 50 mA internal Iref scale. The powerdown
mode is read-only and derived from the channel's configured type.

Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com>
---
 drivers/iio/dac/Kconfig   |   1 +
 drivers/iio/dac/ad3530r.c | 278 +++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 265 insertions(+), 14 deletions(-)

diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index d6d560c09e25..e9f388f8fac3 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -16,6 +16,7 @@ config AD3530R
 	  - AD3530/AD3530R (8-channel)
 	  - AD3531/AD3531R (4-channel)
 	  - AD3532/AD3532R (16-channel)
+	  - AD5710R/AD5711R (8-channel configurable IDAC/VDAC)
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad3530r.
diff --git a/drivers/iio/dac/ad3530r.c b/drivers/iio/dac/ad3530r.c
index 97483534f8c3..935b3a832d8e 100644
--- a/drivers/iio/dac/ad3530r.c
+++ b/drivers/iio/dac/ad3530r.c
@@ -3,6 +3,7 @@
  * AD3530R/AD3530 8-channel, 16-bit Voltage Output DAC Driver
  * AD3531R/AD3531 4-channel, 16-bit Voltage Output DAC Driver
  * AD3532R/AD3532 16-channel, 16-bit Voltage Output DAC Driver
+ * AD5710R/AD5711R 8-channel, 16-/12-bit Configurable IDAC/VDAC Driver
  *
  * Copyright 2025 Analog Devices Inc.
  */
@@ -27,6 +28,8 @@
 #include <linux/types.h>
 #include <linux/units.h>
 
+#include <dt-bindings/iio/addac/adi,ad74413r.h>
+
 #define AD3530R_INTERFACE_CONFIG_A		0x00
 #define AD3530R_OUTPUT_OPERATING_MODE_0		0x20
 #define AD3530R_OUTPUT_OPERATING_MODE_1		0x21
@@ -39,6 +42,8 @@
 #define AD3531R_SW_LDAC_TRIG_A			0xDD
 #define AD3531R_INPUT_CH			0xE3
 
+#define AD5710R_CHN_VMODE_EN			0xFF
+
 /* AD3532R/AD3532 bank 0 registers (channels 0-7) */
 #define AD3532R_INTERFACE_CONFIG_A_0		0x1000
 #define AD3532R_OUTPUT_OPERATING_MODE_0		0x1020
@@ -62,15 +67,18 @@
 #define AD3530R_OUTPUT_CONTROL_RANGE		BIT(2)
 #define AD3530R_REFERENCE_CONTROL_SEL		BIT(0)
 #define AD3530R_OP_MODE_CHAN_MSK(chan)		(GENMASK(1, 0) << 2 * (chan))
+#define AD5710R_CHN_VMODE_EN_BIT(chan)		BIT(chan)
 
 #define AD3530R_SW_RESET			(BIT(7) | BIT(0))
 #define AD3530R_INTERNAL_VREF_mV		2500
+#define AD5710R_INTERNAL_IREF_mA		50
 #define AD3530R_LDAC_PULSE_US			100
 
 #define AD3530R_CH_PER_REG			4
 #define AD3530R_CH_PER_BANK			8
 #define AD3531R_MAX_CHANNELS			4
 #define AD3532R_MAX_CHANNELS			16
+#define AD5710R_NUM_CHANNELS			8
 
 enum ad3530r_mode {
 	AD3530R_NORMAL_OP,
@@ -99,6 +107,7 @@ struct ad3530r_chip_info {
 	unsigned int num_op_mode_regs;
 	unsigned int resolution;
 	bool internal_ref_support;
+	bool channel_configurable;
 };
 
 struct ad3530r_state {
@@ -107,6 +116,8 @@ struct ad3530r_state {
 	struct mutex lock;
 	struct ad3530r_chan chan[AD3532R_MAX_CHANNELS];
 	const struct ad3530r_chip_info *chip_info;
+	const struct iio_chan_spec *channels;
+	unsigned int num_channels;
 	struct gpio_desc *ldac_gpio;
 	int vref_mV;
 	/*
@@ -152,6 +163,11 @@ static const char * const ad3532r_powerdown_modes[] = {
 	"three_state",
 };
 
+static const char * const ad5710r_powerdown_modes[] = {
+	"15kohm_to_gnd",
+	"three_state",
+};
+
 static int ad3530r_get_powerdown_mode(struct iio_dev *indio_dev,
 				      const struct iio_chan_spec *chan)
 {
@@ -194,6 +210,26 @@ static const struct iio_enum ad3532r_powerdown_mode_enum = {
 	.set = ad3530r_set_powerdown_mode,
 };
 
+static int ad5710r_get_powerdown_mode(struct iio_dev *indio_dev,
+				      const struct iio_chan_spec *chan)
+{
+	struct ad3530r_state *st = iio_priv(indio_dev);
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(st->regmap, AD5710R_CHN_VMODE_EN, &val);
+	if (ret)
+		return ret;
+
+	return !(val & AD5710R_CHN_VMODE_EN_BIT(chan->channel));
+}
+
+static const struct iio_enum ad5710r_powerdown_mode_enum = {
+	.items = ad5710r_powerdown_modes,
+	.num_items = ARRAY_SIZE(ad5710r_powerdown_modes),
+	.get = ad5710r_get_powerdown_mode,
+};
+
 static ssize_t ad3530r_get_dac_powerdown(struct iio_dev *indio_dev,
 					 uintptr_t private,
 					 const struct iio_chan_spec *chan,
@@ -277,6 +313,54 @@ static ssize_t ad3532r_set_dac_powerdown(struct iio_dev *indio_dev,
 	return len;
 }
 
+static ssize_t ad5710r_get_dac_powerdown(struct iio_dev *indio_dev,
+					 uintptr_t private,
+					 const struct iio_chan_spec *chan,
+					 char *buf)
+{
+	struct ad3530r_state *st = iio_priv(indio_dev);
+	unsigned int reg_offset, ch_in_reg, reg, mode, mask;
+	int ret;
+
+	reg_offset = chan->channel / AD3530R_CH_PER_REG;
+	ch_in_reg = chan->channel % AD3530R_CH_PER_REG;
+	reg = AD3530R_OUTPUT_OPERATING_MODE_0 + reg_offset;
+	mask = AD3530R_OP_MODE_CHAN_MSK(ch_in_reg);
+
+	ret = regmap_read(st->regmap, reg, &mode);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%d\n", !!(mode & mask));
+}
+
+static ssize_t ad5710r_set_dac_powerdown(struct iio_dev *indio_dev,
+					 uintptr_t private,
+					 const struct iio_chan_spec *chan,
+					 const char *buf, size_t len)
+{
+	struct ad3530r_state *st = iio_priv(indio_dev);
+	unsigned int reg_offset, ch_in_reg, reg, mask, val;
+	bool powerdown;
+	int ret;
+
+	ret = kstrtobool(buf, &powerdown);
+	if (ret)
+		return ret;
+
+	reg_offset = chan->channel / AD3530R_CH_PER_REG;
+	ch_in_reg = chan->channel % AD3530R_CH_PER_REG;
+	reg = AD3530R_OUTPUT_OPERATING_MODE_0 + reg_offset;
+	mask = AD3530R_OP_MODE_CHAN_MSK(ch_in_reg);
+	val = field_prep(mask, powerdown);
+
+	ret = regmap_update_bits(st->regmap, reg, mask, val);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
 static int ad3530r_trigger_sw_ldac_reg(unsigned int channel)
 {
 	return AD3530R_SW_LDAC_TRIG_A;
@@ -343,7 +427,10 @@ static int ad3530r_read_raw(struct iio_dev *indio_dev,
 
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
-		*val = st->vref_mV;
+		if (chan->type == IIO_CURRENT)
+			*val = AD5710R_INTERNAL_IREF_mA;
+		else
+			*val = st->vref_mV;
 		*val2 = st->chip_info->resolution;
 
 		return IIO_VAL_FRACTIONAL_LOG2;
@@ -419,6 +506,17 @@ static const struct iio_chan_spec_ext_info ad3532r_ext_info[] = {
 	{ }
 };
 
+static const struct iio_chan_spec_ext_info ad5710r_ext_info[] = {
+	{
+		.name = "powerdown",
+		.shared = IIO_SEPARATE,
+		.read = ad5710r_get_dac_powerdown,
+		.write = ad5710r_set_dac_powerdown,
+	},
+	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5710r_powerdown_mode_enum),
+	{ }
+};
+
 #define AD3530R_CHAN(_chan, _ext_info)				\
 {								\
 	.type = IIO_VOLTAGE,					\
@@ -467,6 +565,17 @@ static const struct iio_chan_spec ad3532r_channels[] = {
 	AD3530R_CHAN(15, ad3532r_ext_info),
 };
 
+static const struct iio_chan_spec ad5710r_channels[] = {
+	AD3530R_CHAN(0, ad5710r_ext_info),
+	AD3530R_CHAN(1, ad5710r_ext_info),
+	AD3530R_CHAN(2, ad5710r_ext_info),
+	AD3530R_CHAN(3, ad5710r_ext_info),
+	AD3530R_CHAN(4, ad5710r_ext_info),
+	AD3530R_CHAN(5, ad5710r_ext_info),
+	AD3530R_CHAN(6, ad5710r_ext_info),
+	AD3530R_CHAN(7, ad5710r_ext_info),
+};
+
 static const unsigned int ad3530r_if_config[] = {
 	AD3530R_INTERFACE_CONFIG_A,
 };
@@ -522,6 +631,12 @@ static const struct regmap_config ad3532r_regmap_config = {
 	.max_register = AD3532R_MAX_REG_ADDR,
 };
 
+static const struct regmap_config ad5710r_regmap_config = {
+	.reg_bits = 16,
+	.val_bits = 8,
+	.max_register = AD5710R_CHN_VMODE_EN,
+};
+
 static const struct ad3530r_chip_info ad3530_chip = {
 	.name = "ad3530",
 	.resolution = 16,
@@ -537,6 +652,7 @@ static const struct ad3530r_chip_info ad3530_chip = {
 	.num_banks = ARRAY_SIZE(ad3530r_if_config),
 	.num_op_mode_regs = ARRAY_SIZE(ad3530r_op_mode),
 	.internal_ref_support = false,
+	.channel_configurable = false,
 };
 
 static const struct ad3530r_chip_info ad3530r_chip = {
@@ -554,6 +670,7 @@ static const struct ad3530r_chip_info ad3530r_chip = {
 	.num_banks = ARRAY_SIZE(ad3530r_if_config),
 	.num_op_mode_regs = ARRAY_SIZE(ad3530r_op_mode),
 	.internal_ref_support = true,
+	.channel_configurable = false,
 };
 
 static const struct ad3530r_chip_info ad3531_chip = {
@@ -571,6 +688,7 @@ static const struct ad3530r_chip_info ad3531_chip = {
 	.num_banks = ARRAY_SIZE(ad3530r_if_config),
 	.num_op_mode_regs = ARRAY_SIZE(ad3531r_op_mode),
 	.internal_ref_support = false,
+	.channel_configurable = false,
 };
 
 static const struct ad3530r_chip_info ad3531r_chip = {
@@ -588,6 +706,7 @@ static const struct ad3530r_chip_info ad3531r_chip = {
 	.num_banks = ARRAY_SIZE(ad3530r_if_config),
 	.num_op_mode_regs = ARRAY_SIZE(ad3531r_op_mode),
 	.internal_ref_support = true,
+	.channel_configurable = false,
 };
 
 static const struct ad3530r_chip_info ad3532_chip = {
@@ -605,6 +724,7 @@ static const struct ad3530r_chip_info ad3532_chip = {
 	.num_banks = ARRAY_SIZE(ad3532r_if_config),
 	.num_op_mode_regs = ARRAY_SIZE(ad3532r_op_mode),
 	.internal_ref_support = false,
+	.channel_configurable = false,
 };
 
 static const struct ad3530r_chip_info ad3532r_chip = {
@@ -622,8 +742,124 @@ static const struct ad3530r_chip_info ad3532r_chip = {
 	.num_banks = ARRAY_SIZE(ad3532r_if_config),
 	.num_op_mode_regs = ARRAY_SIZE(ad3532r_op_mode),
 	.internal_ref_support = true,
+	.channel_configurable = false,
+};
+
+static const struct ad3530r_chip_info ad5710r_chip = {
+	.name = "ad5710r",
+	.resolution = 16,
+	.regmap_config = &ad5710r_regmap_config,
+	.num_channels = ARRAY_SIZE(ad5710r_channels),
+	.sw_ldac_trig_reg = ad3530r_trigger_sw_ldac_reg,
+	.input_ch_reg = ad3530r_input_ch_reg,
+	.interface_config_a = ad3530r_if_config,
+	.output_control = ad3530r_out_ctrl,
+	.reference_control = ad3530r_ref_ctrl,
+	.op_mode = ad3530r_op_mode,
+	.num_banks = ARRAY_SIZE(ad3530r_if_config),
+	.num_op_mode_regs = ARRAY_SIZE(ad3530r_op_mode),
+	.internal_ref_support = true,
+	.channel_configurable = true,
+};
+
+static const struct ad3530r_chip_info ad5711r_chip = {
+	.name = "ad5711r",
+	.resolution = 12,
+	.regmap_config = &ad5710r_regmap_config,
+	.num_channels = ARRAY_SIZE(ad5710r_channels),
+	.sw_ldac_trig_reg = ad3530r_trigger_sw_ldac_reg,
+	.input_ch_reg = ad3530r_input_ch_reg,
+	.interface_config_a = ad3530r_if_config,
+	.output_control = ad3530r_out_ctrl,
+	.reference_control = ad3530r_ref_ctrl,
+	.op_mode = ad3530r_op_mode,
+	.num_banks = ARRAY_SIZE(ad3530r_if_config),
+	.num_op_mode_regs = ARRAY_SIZE(ad3530r_op_mode),
+	.internal_ref_support = true,
+	.channel_configurable = true,
 };
 
+static int ad3530r_parse_channel_cfg(struct ad3530r_state *st)
+{
+	struct device *dev = regmap_get_device(st->regmap);
+	struct iio_chan_spec *channels;
+	int ret, num_chan;
+	int i = 0;
+	u32 reg;
+
+	num_chan = device_get_child_node_count(dev);
+	if (!num_chan)
+		return dev_err_probe(dev, -ENODEV, "No channels configured\n");
+
+	channels = devm_kcalloc(dev, num_chan, sizeof(*channels), GFP_KERNEL);
+	if (!channels)
+		return -ENOMEM;
+
+	device_for_each_child_node_scoped(dev, child) {
+		unsigned int reg_offset, ch_in_reg, mode_reg, mode_mask, ch_func;
+		enum iio_chan_type chan_type;
+
+		ret = fwnode_property_read_u32(child, "reg", &reg);
+		if (ret)
+			return dev_err_probe(dev, ret,
+					     "Failed to read reg property of %pfwP\n",
+					     child);
+
+		if (reg >= AD5710R_NUM_CHANNELS)
+			return dev_err_probe(dev, -EINVAL,
+					     "reg out of range in %pfwP\n",
+					     child);
+
+		ret = fwnode_property_read_u32(child, "adi,ch-func", &ch_func);
+		if (ret)
+			return dev_err_probe(dev, ret,
+					     "Missing adi,ch-func property for %pfwP\n",
+					     child);
+
+		switch (ch_func) {
+		case CH_FUNC_VOLTAGE_OUTPUT:
+			ret = regmap_set_bits(st->regmap, AD5710R_CHN_VMODE_EN,
+					      AD5710R_CHN_VMODE_EN_BIT(reg));
+			if (ret)
+				return dev_err_probe(dev, ret,
+						     "Failed to set voltage output for %pfwP\n",
+						     child);
+
+			chan_type = IIO_VOLTAGE;
+			break;
+		case CH_FUNC_CURRENT_OUTPUT:
+			chan_type = IIO_CURRENT;
+			break;
+		default:
+			return dev_err_probe(dev, -EINVAL,
+					     "Invalid adi,ch-func %u for %pfwP\n",
+					     ch_func, child);
+		}
+
+		channels[i] = ad5710r_channels[reg];
+		channels[i].type = chan_type;
+		i++;
+
+		reg_offset = reg / AD3530R_CH_PER_REG;
+		ch_in_reg = reg % AD3530R_CH_PER_REG;
+		mode_reg = AD3530R_OUTPUT_OPERATING_MODE_0 + reg_offset;
+		mode_mask = AD3530R_OP_MODE_CHAN_MSK(ch_in_reg);
+
+		/* Enable the channel in normal operation mode */
+		ret = regmap_update_bits(st->regmap, mode_reg, mode_mask,
+					 field_prep(mode_mask, AD3530R_NORMAL_OP));
+		if (ret)
+			return dev_err_probe(dev, ret,
+					     "Failed to set normal operating mode for %pfwP\n",
+					     child);
+	}
+
+	st->channels = channels;
+	st->num_channels = num_chan;
+
+	return 0;
+}
+
 static int ad3530r_set_reg_bank_bits(const struct ad3530r_state *st,
 				     const unsigned int *regs,
 				     unsigned int num_regs,
@@ -707,19 +943,29 @@ static int ad3530r_setup(struct ad3530r_state *st, int external_vref_uV)
 		st->vref_mV = range_multiplier * AD3530R_INTERNAL_VREF_mV;
 	}
 
-	/* Set normal operating mode for all channels */
-	val = FIELD_PREP(AD3530R_OP_MODE_CHAN_MSK(0), AD3530R_NORMAL_OP) |
-	      FIELD_PREP(AD3530R_OP_MODE_CHAN_MSK(1), AD3530R_NORMAL_OP) |
-	      FIELD_PREP(AD3530R_OP_MODE_CHAN_MSK(2), AD3530R_NORMAL_OP) |
-	      FIELD_PREP(AD3530R_OP_MODE_CHAN_MSK(3), AD3530R_NORMAL_OP);
+	if (chip_info->channel_configurable) {
+		/* Channels and their operating mode are configured from DT */
+		ret = ad3530r_parse_channel_cfg(st);
+		if (ret)
+			return ret;
+	} else {
+		/* Set normal operating mode for all channels */
+		val = FIELD_PREP(AD3530R_OP_MODE_CHAN_MSK(0), AD3530R_NORMAL_OP) |
+		      FIELD_PREP(AD3530R_OP_MODE_CHAN_MSK(1), AD3530R_NORMAL_OP) |
+		      FIELD_PREP(AD3530R_OP_MODE_CHAN_MSK(2), AD3530R_NORMAL_OP) |
+		      FIELD_PREP(AD3530R_OP_MODE_CHAN_MSK(3), AD3530R_NORMAL_OP);
+
+		ret = ad3530r_write_reg_banks(st, chip_info->op_mode,
+					      chip_info->num_op_mode_regs, val);
+		if (ret)
+			return ret;
 
-	ret = ad3530r_write_reg_banks(st, st->chip_info->op_mode,
-				      st->chip_info->num_op_mode_regs, val);
-	if (ret)
-		return ret;
+		for (unsigned int i = 0; i < chip_info->num_channels; i++)
+			st->chan[i].powerdown_mode = AD3530R_POWERDOWN_32K;
 
-	for (unsigned int i = 0; i < st->chip_info->num_channels; i++)
-		st->chan[i].powerdown_mode = AD3530R_POWERDOWN_32K;
+		st->channels = chip_info->channels;
+		st->num_channels = chip_info->num_channels;
+	}
 
 	st->ldac_gpio = devm_gpiod_get_optional(dev, "ldac", GPIOD_OUT_LOW);
 	if (IS_ERR(st->ldac_gpio))
@@ -784,8 +1030,8 @@ static int ad3530r_probe(struct spi_device *spi)
 	indio_dev->name = st->chip_info->name;
 	indio_dev->info = &ad3530r_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
-	indio_dev->channels = st->chip_info->channels;
-	indio_dev->num_channels = st->chip_info->num_channels;
+	indio_dev->channels = st->channels;
+	indio_dev->num_channels = st->num_channels;
 
 	return devm_iio_device_register(&spi->dev, indio_dev);
 }
@@ -797,6 +1043,8 @@ static const struct spi_device_id ad3530r_id[] = {
 	{ .name = "ad3531r", .driver_data = (kernel_ulong_t)&ad3531r_chip },
 	{ .name = "ad3532", .driver_data = (kernel_ulong_t)&ad3532_chip },
 	{ .name = "ad3532r", .driver_data = (kernel_ulong_t)&ad3532r_chip },
+	{ .name = "ad5710r", .driver_data = (kernel_ulong_t)&ad5710r_chip },
+	{ .name = "ad5711r", .driver_data = (kernel_ulong_t)&ad5711r_chip },
 	{ }
 };
 MODULE_DEVICE_TABLE(spi, ad3530r_id);
@@ -808,6 +1056,8 @@ static const struct of_device_id ad3530r_of_match[] = {
 	{ .compatible = "adi,ad3531r", .data = &ad3531r_chip },
 	{ .compatible = "adi,ad3532", .data = &ad3532_chip },
 	{ .compatible = "adi,ad3532r", .data = &ad3532r_chip },
+	{ .compatible = "adi,ad5710r", .data = &ad5710r_chip },
+	{ .compatible = "adi,ad5711r", .data = &ad5711r_chip },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, ad3530r_of_match);

-- 
2.34.1

Re: [PATCH v2 4/4] iio: dac: ad3530r: add support for AD5710R/AD5711R

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] The `powerdown_mode` sysfs attribute is exposed with write permissions despite being read-only, causing write attempts to fail unconditionally with `-EINVAL`.
--

--- Patch [4]: [PATCH v2 4/4] iio: dac: ad3530r: add support for AD5710R/AD5711R ---
commit 3c7f6e84bbb3d2178089f97875a1f7dc3599d417
Author: Kim Seer Paller <kimseer.paller@analog.com>

iio: dac: ad3530r: add support for AD5710R/AD5711R

This patch adds support for the AD5710R/AD5711R 8-channel configurable 
IDAC/VDAC parts. The new devices are folded into the ad3530r driver as 
they share the same register map and access model.

> diff --git a/drivers/iio/dac/ad3530r.c b/drivers/iio/dac/ad3530r.c
> index 97483534f8c33..935b3a832d8e9 100644
> --- a/drivers/iio/dac/ad3530r.c
> +++ b/drivers/iio/dac/ad3530r.c

[ ... ]

> @@ -194,6 +210,26 @@ static const struct iio_enum ad3532r_powerdown_mode_enum = {
>  	.set = ad3530r_set_powerdown_mode,
>  };
>  
> +static int ad5710r_get_powerdown_mode(struct iio_dev *indio_dev,
> +				      const struct iio_chan_spec *chan)
> +{
> +	struct ad3530r_state *st = iio_priv(indio_dev);
> +	unsigned int val;
> +	int ret;
> +
> +	ret = regmap_read(st->regmap, AD5710R_CHN_VMODE_EN, &val);
> +	if (ret)
> +		return ret;
> +
> +	return !(val & AD5710R_CHN_VMODE_EN_BIT(chan->channel));
> +}
> +
> +static const struct iio_enum ad5710r_powerdown_mode_enum = {
> +	.items = ad5710r_powerdown_modes,
> +	.num_items = ARRAY_SIZE(ad5710r_powerdown_modes),
> +	.get = ad5710r_get_powerdown_mode,
> +};
> +

[ ... ]

> @@ -419,6 +506,17 @@ static const struct iio_chan_spec_ext_info ad3532r_ext_info[] = {
>  	{ }
>  };
>  
> +static const struct iio_chan_spec_ext_info ad5710r_ext_info[] = {
> +	{
> +		.name = "powerdown",
> +		.shared = IIO_SEPARATE,
> +		.read = ad5710r_get_dac_powerdown,
> +		.write = ad5710r_set_dac_powerdown,
> +	},
> +	IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5710r_powerdown_mode_enum),

[Severity: Low]
Does using the IIO_ENUM macro here incorrectly expose the attribute as writable?

Since ad5710r_powerdown_mode_enum lacks a .set callback, any writes to the
powerdown_mode sysfs attribute will fail unconditionally with -EINVAL. 

However, the IIO_ENUM macro automatically assigns iio_enum_write to the .write 
callback, which grants write permissions in sysfs. Should this attribute be 
manually defined in the ext_info array without a .write callback to properly 
enforce read-only semantics at the VFS layer?

> +	{ }
> +};
> +
>  #define AD3530R_CHAN(_chan, _ext_info)				\
>  {								\
>  	.type = IIO_VOLTAGE,					\

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260721-iio-ad5710r-upstream-v2-0-324949dc72da@analog.com?part=4

Re: [PATCH v2 2/4] dt-bindings: iio: dac: add adi,ad5710r.yaml

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 2 potential issue(s) to consider:
- [Medium] The `adi,range-double` property is defined as a global device property, artificially limiting the hardware's per-channel capabilities and conflicting with current output modes.
- [Medium] The `reg` property inside `patternProperties` incorrectly uses `items` to apply numeric constraints, rendering channel bounds checking completely ineffective.
--

--- Patch [2]: [PATCH v2 2/4] dt-bindings: iio: dac: add adi,ad5710r.yaml ---
commit fe69da2e77f6f1de3acc9e529bec6856901e4e98
Author: Kim Seer Paller <kimseer.paller@analog.com>

dt-bindings: iio: dac: add adi,ad5710r.yaml

Add device tree bindings for the Analog Devices AD5710R/AD5711R
8-channel 12-/16-bit Configurable IDAC/VDAC.

> diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad5710r.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ad5710r.yaml
> new file mode 100644
> index 0000000000000..17c1bf0092421
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/dac/adi,ad5710r.yaml

[ ... ]

> +  adi,range-double:
> +    description:
> +      Configure the output range for all channels. If the property is present,
> +      the output will range from 0V to 2Vref. If the property is not present,
> +      the output will range from 0V to Vref.
> +    type: boolean

[Severity: Medium]
Since the description notes that each channel can be independently configured
as either a voltage or current output, should this property be placed inside
the channel patternProperties block instead? 

Defining it globally seems to restrict configuring the output range on a
per-channel basis, and might also semantically conflict with channels
configured for current output.

> +
> +patternProperties:
> +  "^channel@[0-7]$":
> +    $ref: /schemas/iio/dac/dac.yaml#
> +    type: object
> +    description:
> +      Represents the external channels which are connected to the DAC.
> +
> +    properties:
> +      reg:
> +        description: Channel number
> +        items:
> +          minimum: 0
> +          maximum: 7

[Severity: Medium]
Does placing minimum and maximum inside an items dictionary correctly apply
the constraints? 

In dt-schema, the reg property is mapped to a matrix. Wrapping the constraints
in items applies them to the tuple array instead of the scalar integers,
causing schema validation to ignore them and silently accept out-of-bounds
channel numbers. 

Could these bounds be placed directly under the reg property?

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260721-iio-ad5710r-upstream-v2-0-324949dc72da@analog.com?part=2

Re: [PATCH v2 4/4] iio: dac: ad3530r: add support for AD5710R/AD5711R

[Andy Shevchenko]

On Tue, Jul 21, 2026 at 04:47:13PM +0800, Kim Seer Paller wrote:
> Add support for the AD5710R/AD5711R, 8-channel 16-/12-bit configurable
> IDAC/VDAC parts. They share the AD3530R register map and access model,
> so fold them into this driver.
> 
> Each channel is configured as voltage or current output from its DT
> channel@N node via adi,ch-func, building the iio_chan_spec dynamically.
> Voltage channels enable VMODE_EN and report the reference-derived scale,
> current channels report the 50 mA internal Iref scale. The powerdown
> mode is read-only and derived from the channel's configured type.

...

>   * AD3530R/AD3530 8-channel, 16-bit Voltage Output DAC Driver
>   * AD3531R/AD3531 4-channel, 16-bit Voltage Output DAC Driver
>   * AD3532R/AD3532 16-channel, 16-bit Voltage Output DAC Driver
> + * AD5710R/AD5711R 8-channel, 16-/12-bit Configurable IDAC/VDAC Driver

In the above only a single data width is mentioned, maybe split this one?

...

>  #define AD3531R_MAX_CHANNELS			4
>  #define AD3532R_MAX_CHANNELS			16
> +#define AD5710R_NUM_CHANNELS			8

Why NUM and not MAX?

...

> +static int ad5710r_get_powerdown_mode(struct iio_dev *indio_dev,
> +				      const struct iio_chan_spec *chan)
> +{
> +	struct ad3530r_state *st = iio_priv(indio_dev);
> +	unsigned int val;
> +	int ret;
> +
> +	ret = regmap_read(st->regmap, AD5710R_CHN_VMODE_EN, &val);
> +	if (ret)
> +		return ret;
> +
> +	return !(val & AD5710R_CHN_VMODE_EN_BIT(chan->channel));

regmap_test_bits()

> +}

...

> +static ssize_t ad5710r_get_dac_powerdown(struct iio_dev *indio_dev,
> +					 uintptr_t private,
> +					 const struct iio_chan_spec *chan,
> +					 char *buf)
> +{
> +	struct ad3530r_state *st = iio_priv(indio_dev);
> +	unsigned int reg_offset, ch_in_reg, reg, mode, mask;
> +	int ret;
> +
> +	reg_offset = chan->channel / AD3530R_CH_PER_REG;
> +	ch_in_reg = chan->channel % AD3530R_CH_PER_REG;
> +	reg = AD3530R_OUTPUT_OPERATING_MODE_0 + reg_offset;
> +	mask = AD3530R_OP_MODE_CHAN_MSK(ch_in_reg);
> +
> +	ret = regmap_read(st->regmap, reg, &mode);
> +	if (ret)
> +		return ret;
> +
> +	return sysfs_emit(buf, "%d\n", !!(mode & mask));

Ditto.

> +}

...

> +static const struct regmap_config ad5710r_regmap_config = {
> +	.reg_bits = 16,
> +	.val_bits = 8,
> +	.max_register = AD5710R_CHN_VMODE_EN,
> +};

No cache?

...

> +static int ad3530r_parse_channel_cfg(struct ad3530r_state *st)
> +{
> +	struct device *dev = regmap_get_device(st->regmap);
> +	struct iio_chan_spec *channels;
> +	int ret, num_chan;

Why is 'num_chan' signed?


> +	int i = 0;

Signed? Also, split assignment and move it closer to its first user.

> +	u32 reg;
> +
> +	num_chan = device_get_child_node_count(dev);
> +	if (!num_chan)
> +		return dev_err_probe(dev, -ENODEV, "No channels configured\n");
> +
> +	channels = devm_kcalloc(dev, num_chan, sizeof(*channels), GFP_KERNEL);
> +	if (!channels)
> +		return -ENOMEM;


	i = 0;

> +	device_for_each_child_node_scoped(dev, child) {
> +		unsigned int reg_offset, ch_in_reg, mode_reg, mode_mask, ch_func;
> +		enum iio_chan_type chan_type;
> +
> +		ret = fwnode_property_read_u32(child, "reg", &reg);
> +		if (ret)
> +			return dev_err_probe(dev, ret,
> +					     "Failed to read reg property of %pfwP\n",
> +					     child);
> +
> +		if (reg >= AD5710R_NUM_CHANNELS)
> +			return dev_err_probe(dev, -EINVAL,
> +					     "reg out of range in %pfwP\n",
> +					     child);
> +
> +		ret = fwnode_property_read_u32(child, "adi,ch-func", &ch_func);
> +		if (ret)
> +			return dev_err_probe(dev, ret,
> +					     "Missing adi,ch-func property for %pfwP\n",
> +					     child);
> +
> +		switch (ch_func) {
> +		case CH_FUNC_VOLTAGE_OUTPUT:
> +			ret = regmap_set_bits(st->regmap, AD5710R_CHN_VMODE_EN,
> +					      AD5710R_CHN_VMODE_EN_BIT(reg));
> +			if (ret)
> +				return dev_err_probe(dev, ret,
> +						     "Failed to set voltage output for %pfwP\n",
> +						     child);
> +
> +			chan_type = IIO_VOLTAGE;
> +			break;
> +		case CH_FUNC_CURRENT_OUTPUT:
> +			chan_type = IIO_CURRENT;
> +			break;
> +		default:
> +			return dev_err_probe(dev, -EINVAL,
> +					     "Invalid adi,ch-func %u for %pfwP\n",
> +					     ch_func, child);
> +		}
> +
> +		channels[i] = ad5710r_channels[reg];
> +		channels[i].type = chan_type;
> +		i++;
> +
> +		reg_offset = reg / AD3530R_CH_PER_REG;
> +		ch_in_reg = reg % AD3530R_CH_PER_REG;
> +		mode_reg = AD3530R_OUTPUT_OPERATING_MODE_0 + reg_offset;
> +		mode_mask = AD3530R_OP_MODE_CHAN_MSK(ch_in_reg);
> +
> +		/* Enable the channel in normal operation mode */
> +		ret = regmap_update_bits(st->regmap, mode_reg, mode_mask,
> +					 field_prep(mode_mask, AD3530R_NORMAL_OP));
> +		if (ret)
> +			return dev_err_probe(dev, ret,
> +					     "Failed to set normal operating mode for %pfwP\n",
> +					     child);
> +	}
> +
> +	st->channels = channels;
> +	st->num_channels = num_chan;
> +
> +	return 0;
> +}

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v2 2/4] dt-bindings: iio: dac: add adi,ad5710r.yaml

[Conor Dooley]

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On Tue, Jul 21, 2026 at 04:47:11PM +0800, Kim Seer Paller wrote:
> Add device tree bindings for the Analog Devices AD5710R/AD5711R
> 8-channel 12-/16-bit Configurable IDAC/VDAC.
> 
> Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com>
> ---
>  .../devicetree/bindings/iio/dac/adi,ad5710r.yaml   | 143 +++++++++++++++++++++

> +patternProperties:
> +  "^channel@[0-7]$":
> +    $ref: /schemas/iio/dac/dac.yaml#
> +    type: object
> +    description:
> +      Represents the external channels which are connected to the DAC.
> +
> +    properties:
> +      reg:
> +        description: Channel number
> +        items:
> +          minimum: 0
> +          maximum: 7
> +
> +      adi,ch-func:
> +        description:
> +          Channel output type. Use CH_FUNC_VOLTAGE_OUTPUT for voltage
> +          output or CH_FUNC_CURRENT_OUTPUT for current output.
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        enum: [1, 2]

Please make this property a string.

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