[PATCH v7 0/7] iio: dac: Add support for AD5529R DAC

[PATCH v7 0/7] iio: dac: Add support for AD5529R DAC

[Janani Sunil]

This patch series adds support for Analog Devices AD5529R, a 16 channel
16 and 12 bit voltage Digital-to-Analog Converter (DAC) with integrated
precision reference. The AD5529R operates from both unipolar and
bipolar supplies. The device communicates via SPI interface.

**Device Overview:**
The AD5529R features 16 independent DAC channels, with 16 or 12 bit
resolution, allowing independently programmable output ranges. The
internal 4.096V precision reference sets the accuracy of the output
voltage.

The device can encode a hardware address in its SPI command frame,
allowing up to 4 devices to share a single chip select. This series
introduces a generic spi-device-addr property for describing this type
of addressing. Existing equivalent properties in the Microchip MCP3564
and MCP3911 bindings are retained but marked as deprecated.

**Features Implemented:**
- Support for AD5529R 12-bit and 16-bit variants via device match data.
- Support for a single DAC device using any hardware address between 0
  and 3.
- Reset support via reset controller framework.
- Dual regmap configuration to handle 8 and 16 bit registers.
- Per-channel output range configuration from devicetree.
- Optional external reference and bipolar supply handling.

**Patch Summary:**
1. Add the generic spi-device-addr SPI peripheral property.
2. Add spi-device-addr to the MCP3564 binding and deprecate its legacy
   vendor specific property.
3. Update MCP3564 driver to support spi-device-addr.
4. Add spi-device-addr to the MCP3911 binding and deprecate its legacy
   vendor specific property.
5. Update MCP3911 driver to support spi-device-addr.
6. AD5529R binding documentation with channel configuration.
7. Implement AD5529R IIO DAC Driver with regmap support.

**Testing:**
The driver was compiled and tested on the EVAL-AD5529R-ARDZ using a
coraZ7 with a mainline v7.0 kernel.

**Driver Rationale:**
AD5529R introduces:
1. A unique register layout
2. Mixed 8-bit and 16-bit register accesses
3. Hardware specific features like function generators, multi-die
hotpath registers etc.

The device warrants its own driver due to these fundamental
architectural differences, that would require substantial changes to
existing drivers without providing reusable benefits. The standalone
driver also allows future extensions for related devices in the same
family.

**Not Implemented in this Series:**
The binding includes generic, peripheral level device addressing needed for
multi-device support using a shared CS, but the driver presently
supports only a single device.

Signed-off-by: Janani Sunil <janani.sunil@analog.com>
---
Changes in v7:
- Drop #include <linux/mod_devicetable.h>
- Add comment on minimum HW reset low width.
- Flip the vref regulator error check.
- Clarify why spi-device-addr is an array, with one address per physical
  device sharing a chip select.
- Add default addresses for mcp3564 and mcp3911 bindings.
- Initialize AD5529R regmap configurations locally using designated
  initializers.
- Update "Patch Summary" section in the cover letter.
- Link to v6: https://lore.kernel.org/r/20260715-ad5529r-driver-v6-0-cfdf8b9f5ee3@analog.com

Changes in v6:
- Rename spi,device-addr to spi-device-addr and define it as an array at
  peripheral node level.
- Fix the SPI binding patch subject prefix to use "spi: dt-bindings:".
- Add spi-device-addr to the MCP3564 and MCP3911 bindings.
- Deprecate the existing Microchip-specific device-address properties.
- Replace adi,output-range-microvolt with output-range-microvolt.
- Move AD5529R device addressing from channel nodes to the peripheral
  node.
- Include linux/types.h
- Honour non-zero hardware address in the AD5529R driver.
- Dynamically expose only the channels described by devicetree and
  remove unused scan type definitions.
- Use explicit reset assertion and deassertion as the GPIO reset
  controller does not implement reset_control_reset().
- Use the MICRO and MILLI unit constants when matching output ranges.
-  Simplify optional reference regulator handling and remove the
   external reference comment.
- Simplify error messages and stick to 80 col.
- Link to v5: https://lore.kernel.org/r/20260701-ad5529r-driver-v5-0-ed087900e642@analog.com

Changes in v5:
- Move register bitfield definitions next to their parent register
  addresses.
- Remove spurious extra indent.
- Rename ad5529r_output_ranges_mv[] to ad5529r_output_ranges_mV[].
- Remove extra parentheses in regmap_reg_range() for the readback range.
- Use reset_control_reset() instead of reset_control_deassert().
- Use 10 * USEC_PER_MSEC instead of a bare 10000 in fsleep().
- Use fwnode_property_present() to explicitly guard the optional property.
- Rewrite external_vref detection using explicit if/else.
- Follow reverse christmas tree variable declaration order.
- Improve invalid channel error message to include the maximum.
- Add a new spi property to include the SPI device address.
- Update ad5529r devicetree binding to allow more than 16 channels to include multiple DACs.
- Update cover letter to add a mention about the multi device support.
- Update driver commit message to describe the device further.
- Link to v4: https://lore.kernel.org/r/20260609-ad5529r-driver-v4-0-2e4c02234a1a@analog.com

Changes in v4:
- Fix DT child-node regex for hexadecimal channel addresses.
- Wrap long DT binding description lines.
- Simplify optional `vref-supply` and `hvss-supply` handling.
- Update REF_SEL programming for optional external reference use.
- Clean up range parsing and error messages.
- Simplify debugfs register access by calling regmap helpers directly.
- Add clarifying comments for reset settling time and RAW reads from `DAC_INPUT_A`.
- Remove an unused vref regulator pointer and an include.
- Rename the REF_SEL bit define and clean up small driver details.
- Toggle pins defined as PWM pins, instead of GPIOs
- Update cover letter to sync up latest changes.
- Link to v3: https://lore.kernel.org/r/20260519-ad5529r-driver-v3-0-267c0731aa68@analog.com

Changes in v3:
- Split into adi,ad5529r-16 and adi,ad5529r-12 device tree compatibles
- Add DT-based output range configuration via adi,output-range-microvolt
- Expand DT binding: vref-supply, clear/tg GPIOs, interrupts, muxout
- Correct power supply voltage specifications as per datasheet
- Reduce SPI frequency limit to 25MHz as per datasheet specs
- Switch to autoincrement addressing mode, remove +1 register offsets
- Use DT match data instead of device ID detection for fallback support
- Implement dynamic scale/offset calculation per configured channel range
- Added explicit val_format_endian and reg_stride for 16-bit regmap bus
- Code cleanup: alphabetical includes, ARRAY_SIZE(), unused defines
- Minor: .sign→.format field, simplify read/write order, optional hvss-supply
- Remove redundant driver documentation ad5529r.rst
- Link to v2: https://lore.kernel.org/r/20260508-ad5529r-driver-v2-0-e315441685d7@analog.com

Changes in v2:
- Fix IIO scale to use millivolts per ABI requirement
- Fix documentation voltage calculations (2.5V not 2.048V)
- Fix bipolar ranges in documentation (±5V, ±10V, ±15V, ±20V)
- Fix alphabetical ordering in documentation index
- Add missing newline to documentation file
- Fix scale units description (millivolts not microvolts)
- Include a section for driver rationale in the cover letter
- Reword contents in cover letter 12/16 bit generic->variant
- Add dependency array for spi-cpha and spi-cpol properties
- Link to v1: https://lore.kernel.org/r/20260507-ad5529r-driver-v1-0-b4460f3cb44f@analog.com

---
Janani Sunil (7):
      spi: dt-bindings: Add spi-device-addr peripheral property
      dt-bindings: iio: adc: microchip,mcp3564: Add spi-device-addr
      iio: adc: mcp3564: Add support for spi-device-addr
      dt-bindings: iio: adc: microchip,mcp3911: Add spi-device-addr
      iio: adc: mcp3911: Add support for spi-device-addr
      dt-bindings: iio: dac: Add AD5529R
      iio: dac: Add AD5529R DAC driver support

 .../bindings/iio/adc/microchip,mcp3564.yaml        |  10 +-
 .../bindings/iio/adc/microchip,mcp3911.yaml        |   9 +-
 .../devicetree/bindings/iio/dac/adi,ad5529r.yaml   | 224 +++++++++
 .../bindings/spi/spi-peripheral-props.yaml         |   7 +
 MAINTAINERS                                        |   8 +
 drivers/iio/adc/mcp3564.c                          |   4 +-
 drivers/iio/adc/mcp3911.c                          |   9 +-
 drivers/iio/dac/Kconfig                            |  17 +
 drivers/iio/dac/Makefile                           |   1 +
 drivers/iio/dac/ad5529r.c                          | 501 +++++++++++++++++++++
 10 files changed, 783 insertions(+), 7 deletions(-)
---
base-commit: 93df88612859e8e19dec93c69d563b4b73e9bd4b
change-id: 20260507-ad5529r-driver-866bbdd864de

Best regards,
-- 
Janani Sunil <janani.sunil@analog.com>

[PATCH v7 1/7] spi: dt-bindings: Add spi-device-addr peripheral property

[Janani Sunil]

Some SPI devices support sharing a single chip select across multiple
physical chips by encoding a device address in the SPI frame itself.
Add the generic spi-device-addr property for describing these hardware
addresses. The property is placed on the SPI peripheral node and may
contain multiple addresses.

Signed-off-by: Janani Sunil <janani.sunil@analog.com>
---
 Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
index 880a9f624566..b59d047cf117 100644
--- a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
@@ -142,6 +142,13 @@ properties:
     minItems: 2
     maxItems: 4
 
+  spi-device-addr:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+      Device addresses used when multiple peripherals share a single chip
+      select. The array allows one logical peripheral to comprise multiple
+      physical devices, with one address per device.
+
   st,spi-midi-ns:
     deprecated: true
     description: |

-- 
2.43.0

[PATCH v7 2/7] dt-bindings: iio: adc: microchip,mcp3564: Add spi-device-addr

[Janani Sunil]

Add the generic spi-device-addr property to the binding and deprecate
the existing vendor specific microchip,hw-device-address property.

Signed-off-by: Janani Sunil <janani.sunil@analog.com>
---
 .../devicetree/bindings/iio/adc/microchip,mcp3564.yaml         | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/microchip,mcp3564.yaml b/Documentation/devicetree/bindings/iio/adc/microchip,mcp3564.yaml
index 675319276197..de1ea289e7f5 100644
--- a/Documentation/devicetree/bindings/iio/adc/microchip,mcp3564.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/microchip,mcp3564.yaml
@@ -80,6 +80,7 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     minimum: 0
     maximum: 3
+    deprecated: true
     description:
       The address is set on a per-device basis by fuses in the factory,
       configured on request. If not requested, the fuses are set for 0x1.
@@ -91,6 +92,12 @@ properties:
       clocking of the device address (BITS[7:6] - top two bits of COMMAND BYTE
       which is first one on the wire).
 
+  spi-device-addr:
+    maxItems: 1
+    items:
+      enum: [0, 1, 2, 3]
+    default: [1]
+
   "#io-channel-cells":
     const: 1
 
@@ -123,7 +130,6 @@ dependencies:
 required:
   - compatible
   - reg
-  - microchip,hw-device-address
   - spi-max-frequency
 
 allOf:
@@ -159,7 +165,7 @@ examples:
             spi-cpha;
             spi-cpol;
             spi-max-frequency = <10000000>;
-            microchip,hw-device-address = <1>;
+            spi-device-addr = <1>;
 
             #address-cells = <1>;
             #size-cells = <0>;

-- 
2.43.0

[PATCH v7 3/7] iio: adc: mcp3564: Add support for spi-device-addr

[Janani Sunil]

Read the generic spi-device-addr property when determining the hardware
device address. Fall back to the deprecated microchip,hw-device-address
property to preserve compatibility with existing device trees.

The device address remains 1 when neither property is present.

Signed-off-by: Janani Sunil <janani.sunil@analog.com>
---
 drivers/iio/adc/mcp3564.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/mcp3564.c b/drivers/iio/adc/mcp3564.c
index 36675563829e..71deb05e878e 100644
--- a/drivers/iio/adc/mcp3564.c
+++ b/drivers/iio/adc/mcp3564.c
@@ -1122,7 +1122,9 @@ static int mcp3564_config(struct iio_dev *indio_dev, bool *use_internal_vref_att
 	 * addresses are available when multiple devices are present on the same
 	 * SPI bus with only one Chip Select line for all devices.
 	 */
-	device_property_read_u32(dev, "microchip,hw-device-address", &tmp);
+	ret = device_property_read_u32(dev, "spi-device-addr", &tmp);
+	if (ret)
+		device_property_read_u32(dev, "microchip,hw-device-address", &tmp);
 
 	if (tmp > 3) {
 		dev_err_probe(dev, tmp,

-- 
2.43.0

[PATCH v7 4/7] dt-bindings: iio: adc: microchip,mcp3911: Add spi-device-addr

[Janani Sunil]

Add the generic spi-device-addr property to the binding and deprecate
the existing vendor specific microchip,device-addr property

Signed-off-by: Janani Sunil <janani.sunil@analog.com>
---
 Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml b/Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml
index 3a69ec60edb9..36da2bee1db2 100644
--- a/Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml
@@ -57,6 +57,13 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [0, 1, 2, 3]
     default: 0
+    deprecated: true
+
+  spi-device-addr:
+    maxItems: 1
+    items:
+      enum: [0, 1, 2, 3]
+    default: [0]
 
   vref-supply:
     description: |
@@ -86,7 +93,7 @@ examples:
         interrupts = <15 2>;
         reset-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>;
         spi-max-frequency = <20000000>;
-        microchip,device-addr = <0>;
+        spi-device-addr = <0>;
         vref-supply = <&vref_reg>;
         clocks = <&xtal>;
       };

-- 
2.43.0

[PATCH v7 5/7] iio: adc: mcp3911: Add support for spi-device-addr

[Janani Sunil]

Read the generic spi-device-addr property when determining the hardware
device address. Fall back to the deprecated microchip,device-addr
property and then to the historical device-addr property to preserve
compatibility with existing devicetrees.

The device address remains 0 when none of the properties are present.

Signed-off-by: Janani Sunil <janani.sunil@analog.com>
---
 drivers/iio/adc/mcp3911.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/adc/mcp3911.c b/drivers/iio/adc/mcp3911.c
index ddc3721f3f68..3919a326b4db 100644
--- a/drivers/iio/adc/mcp3911.c
+++ b/drivers/iio/adc/mcp3911.c
@@ -740,10 +740,13 @@ static int mcp3911_probe(struct spi_device *spi)
 	}
 
 	/*
-	 * Fallback to "device-addr" due to historical mismatch between
-	 * dt-bindings and implementation.
+	 * Fall back to the vendor-specific property, then to "device-addr"
+	 * due to a historical mismatch between the binding and implementation.
 	 */
-	ret = device_property_read_u32(dev, "microchip,device-addr", &adc->dev_addr);
+	ret = device_property_read_u32(dev, "spi-device-addr", &adc->dev_addr);
+	if (ret)
+		ret = device_property_read_u32(dev, "microchip,device-addr",
+					       &adc->dev_addr);
 	if (ret)
 		device_property_read_u32(dev, "device-addr", &adc->dev_addr);
 	if (adc->dev_addr > 3) {

-- 
2.43.0

[PATCH v7 6/7] dt-bindings: iio: dac: Add AD5529R

[Janani Sunil]

Devicetree bindings for AD5529R 16 channel 12/16 bit high voltage,
buffered voltage output digital-to-analog converter (DAC) with an
integrated precision reference.

Signed-off-by: Janani Sunil <janani.sunil@analog.com>
---
 .../devicetree/bindings/iio/dac/adi,ad5529r.yaml   | 224 +++++++++++++++++++++
 MAINTAINERS                                        |   7 +
 2 files changed, 231 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad5529r.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ad5529r.yaml
new file mode 100644
index 000000000000..730206fd6eab
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/adi,ad5529r.yaml
@@ -0,0 +1,224 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/dac/adi,ad5529r.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD5529R 16-Channel 12/16-bit High Voltage DAC
+
+maintainers:
+  - Janani Sunil <janani.sunil@analog.com>
+
+description: |
+  The AD5529R is a 16-channel, 12-bit or 16-bit, high voltage, buffered voltage
+  output digital-to-analog converter (DAC) with an integrated precision reference.
+  The device operates from unipolar and bipolar supplies. It is guaranteed
+  monotonic and has built-in rail-to-rail output buffers that can source or
+  sink up to 25mA.
+
+  Specifications:
+  * 16 independent 12-bit or 16-bit DAC channels
+  * Independently programmable output ranges: 0V to 5V, 0V to 10V, 0V to 20V,
+    0V to 40V, ±5V, ±10V, ±15V, and ±20V
+  * The device supports SPI communication with Mode 0 and Mode 3.
+  * 4.096V precision reference, 12ppm/°C maximum
+  * Built-in function generation: Toggle, Sinusoidal Dither, and Ramp waveforms
+  * Multiplexer for output voltage, load current sense and die temperature
+
+  Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad5529r.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad5529r-16   # 16-bit variant
+      - adi,ad5529r-12   # 12-bit variant
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 25000000
+    description:
+      Maximum SPI frequency. The device supports SPI Mode 0 and Mode 3.
+      Read operations are limited to 25MHz maximum.
+
+  reset-gpios:
+    maxItems: 1
+    description:
+      GPIO connected to the RESET pin. Active low. When asserted low,
+      performs a power-on reset and initializes the device to its default state.
+
+  clear-gpios:
+    maxItems: 1
+    description:
+      GPIO connected to the CLEAR pin. Active low. When asserted low,
+      clears all DAC data registers without affecting configuration settings.
+
+  interrupts:
+    maxItems: 1
+    description:
+      Interrupt connected to the ALARM pin. Active low interrupt output
+      for overtemperature conditions, SPI CRC errors, and function completion.
+
+  pwms:
+    minItems: 1
+    maxItems: 4
+    description:
+      PWM signals connected to the TG0-TG3 toggle pins. Pulsing these pins
+      based on trigger edge settings allows selected DACs to be updated
+      synchronously for digital function generation.
+
+  pwm-names:
+    minItems: 1
+    maxItems: 4
+    items:
+      enum: [ tg0, tg1, tg2, tg3 ]
+
+  io-channels:
+    maxItems: 1
+    description:
+      ADC channel connected to the MUXOUT pin for monitoring output voltage,
+      load current sense, and die temperature.
+
+  io-channel-names:
+    const: muxout
+
+  vdd-supply:
+    description: Digital power supply (1.08V to 1.98V)
+
+  avdd-supply:
+    description: Analog power supply (4.75V to 5.25V)
+
+  hvdd-supply:
+    description:
+      High voltage positive supply (7V to 45V). Supply voltage should be chosen
+      based on configured output ranges (see datasheet Table 9).
+
+  hvss-supply:
+    description:
+      High voltage negative supply (-22.5V to 0V). Required only when using
+      bipolar output ranges (±5V, ±10V, ±15V, ±20V). Supply voltage should be
+      chosen based on configured output ranges (see datasheet Table 9).
+
+  vref-supply:
+    description:
+      External voltage reference supply (4.056V to 4.136V, typically 4.096V).
+      When specified, the device uses external reference mode and the VREF pin
+      becomes an input. The device uses the internal 4.096V precision reference
+      otherwise.
+
+  spi-device-addr:
+    minItems: 1
+    maxItems: 4
+    items:
+      enum: [0, 1, 2, 3]
+    default: [0]
+    description:
+      Hardware address of each device, selected by the ID0 and ID1 pins.
+      Up to four AD5529R devices can share a single SPI chip select.
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "^channel@([0-9a-f]{1,2})$":
+    $ref: dac.yaml
+    type: object
+    description: Child nodes for individual channel configuration
+
+    properties:
+      reg:
+        description:
+          Flattened channel number across all AD5529R devices sharing the chip
+          select. Within each 16-channel block, the physical channel number is reg % 16.
+        minimum: 0
+        maximum: 63
+
+      output-range-microvolt:
+        description:
+          Output voltage range for this channel as [min, max] in
+          microvolts.
+        oneOf:
+          - items:
+              - const: 0
+                default: 0
+              - enum: [5000000, 10000000, 20000000, 40000000]
+                default: 5000000
+          - items:
+              - const: -5000000
+              - const: 5000000
+          - items:
+              - const: -10000000
+              - const: 10000000
+          - items:
+              - const: -15000000
+              - const: 15000000
+          - items:
+              - const: -20000000
+              - const: 20000000
+
+    required:
+      - reg
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+  - avdd-supply
+  - hvdd-supply
+
+dependencies:
+  spi-cpha: [ spi-cpol ]
+  spi-cpol: [ spi-cpha ]
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        dac@0 {
+            compatible = "adi,ad5529r-16";
+            reg = <0>;
+            spi-max-frequency = <25000000>;
+            spi-device-addr = <0>;
+
+            vdd-supply = <&vdd_regulator>;
+            avdd-supply = <&avdd_regulator>;
+            hvdd-supply = <&hvdd_regulator>;
+            hvss-supply = <&hvss_regulator>;
+
+            reset-gpios = <&gpio0 87 GPIO_ACTIVE_LOW>;
+
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            channel@0 {
+                reg = <0>;
+                output-range-microvolt = <0 5000000>;
+            };
+
+            channel@1 {
+                reg = <1>;
+                output-range-microvolt = <(-10000000) 10000000>;
+            };
+
+            channel@2 {
+                reg = <2>;
+                output-range-microvolt = <0 40000000>;
+            };
+        };
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index d6c3c7d22403..320e84765ce6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1507,6 +1507,13 @@ W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/adc/adi,ad4851.yaml
 F:	drivers/iio/adc/ad4851.c
 
+ANALOG DEVICES INC AD5529R DRIVER
+M:	Janani Sunil <janani.sunil@analog.com>
+L:	linux-iio@vger.kernel.org
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/dac/adi,ad5529r.yaml
+
 ANALOG DEVICES INC AD5706R DRIVER
 M:	Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
 L:	linux-iio@vger.kernel.org

-- 
2.43.0

[PATCH v7 7/7] iio: dac: Add AD5529R DAC driver support

[Janani Sunil]

Add support for AD5529R 16-channel, 12/16 bit Digital to Analog Converter
from Analog Devices.

The device communicates over SPI and supports per-channel output range
configuration. An optional external 4.096V reference can be used in
place of the internal reference.

Signed-off-by: Janani Sunil <janani.sunil@analog.com>
---
 MAINTAINERS               |   1 +
 drivers/iio/dac/Kconfig   |  17 ++
 drivers/iio/dac/Makefile  |   1 +
 drivers/iio/dac/ad5529r.c | 501 ++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 520 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 320e84765ce6..143714e27d51 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1513,6 +1513,7 @@ L:	linux-iio@vger.kernel.org
 S:	Supported
 W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/dac/adi,ad5529r.yaml
+F:	drivers/iio/dac/ad5529r.c
 
 ANALOG DEVICES INC AD5706R DRIVER
 M:	Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index 657c68e75542..bb1d59889a2a 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -134,6 +134,23 @@ config AD5449
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad5449.
 
+config AD5529R
+	tristate "Analog Devices AD5529R High Voltage DAC driver"
+	depends on SPI_MASTER
+	select REGMAP_SPI
+	help
+	  Say yes here to build support for Analog Devices AD5529R
+	  16-Channel, 12-Bit/16-Bit, 40V High Voltage Precision Digital to Analog
+	  Converter.
+
+	  The device features multiple output voltage ranges from -20V to +20V,
+	  built-in 4.096V voltage reference, and digital functions including
+	  toggle, dither, and ramp modes. Supports both 12-bit and 16-bit
+	  resolution variants.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad5529r.
+
 config AD5592R_BASE
 	tristate
 
diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
index 003431798498..f35e060b3643 100644
--- a/drivers/iio/dac/Makefile
+++ b/drivers/iio/dac/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_AD5446) += ad5446.o
 obj-$(CONFIG_AD5446_SPI) += ad5446-spi.o
 obj-$(CONFIG_AD5446_I2C) += ad5446-i2c.o
 obj-$(CONFIG_AD5449) += ad5449.o
+obj-$(CONFIG_AD5529R) += ad5529r.o
 obj-$(CONFIG_AD5592R_BASE) += ad5592r-base.o
 obj-$(CONFIG_AD5592R) += ad5592r.o
 obj-$(CONFIG_AD5593R) += ad5593r.o
diff --git a/drivers/iio/dac/ad5529r.c b/drivers/iio/dac/ad5529r.c
new file mode 100644
index 000000000000..2fd1dd053da5
--- /dev/null
+++ b/drivers/iio/dac/ad5529r.c
@@ -0,0 +1,501 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AD5529R Digital-to-Analog Converter Driver
+ * 16-Channel, 12/16-Bit, 40V High Voltage Precision DAC
+ *
+ * Copyright 2026 Analog Devices Inc.
+ * Author: Janani Sunil <janani.sunil@analog.com>
+ */
+
+#include <linux/array_size.h>
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/iio/iio.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+#include <linux/spi/spi.h>
+#include <linux/types.h>
+#include <linux/units.h>
+
+#define AD5529R_REG_INTERFACE_CONFIG_A		0x00
+#define   AD5529R_INTERFACE_CONFIG_A_SW_RESET	(BIT(7) | BIT(0))
+#define   AD5529R_INTERFACE_CONFIG_A_ADDR_ASCENSION	BIT(5)
+#define   AD5529R_INTERFACE_CONFIG_A_SDO_ENABLE	BIT(4)
+#define AD5529R_REG_DEVICE_CONFIG		0x02
+#define AD5529R_REG_CHIP_GRADE			0x06
+#define AD5529R_REG_SCRATCH_PAD			0x0A
+#define AD5529R_REG_SPI_REVISION		0x0B
+#define AD5529R_REG_VENDOR_H			0x0D
+#define AD5529R_REG_STREAM_MODE			0x0E
+#define AD5529R_REG_INTERFACE_STATUS_A		0x11
+#define AD5529R_REG_MULTI_DAC_CH_SEL		0x14
+#define AD5529R_REG_OUT_RANGE_BASE		0x3C
+#define AD5529R_REG_OUT_RANGE(ch)		(AD5529R_REG_OUT_RANGE_BASE + (ch) * 2)
+#define AD5529R_REG_DAC_INPUT_A_BASE		0x148
+#define AD5529R_REG_DAC_INPUT_A(ch)		(AD5529R_REG_DAC_INPUT_A_BASE + (ch) * 2)
+#define AD5529R_REG_DAC_DATA_READBACK_BASE	0x16A
+#define AD5529R_REG_TSENS_ALERT_FLAG		0x18C
+#define AD5529R_REG_TSENS_SHTD_FLAG		0x18E
+#define AD5529R_REG_FUNC_BUSY			0x1A0
+#define AD5529R_REG_REF_SEL			0x1A2
+#define   AD5529R_REF_SEL_INTERNAL_REF		BIT(0)
+#define AD5529R_REG_INIT_CRC_ERR_STAT		0x1A4
+#define AD5529R_REG_MULTI_DAC_HOTPATH_SW_LDAC	0x1A8
+
+#define AD5529R_MAX_REGISTER			0x232
+#define AD5529R_8BIT_REG_MAX			0x13
+#define AD5529R_SPI_READ_FLAG			0x80
+#define AD5529R_ADDR_SHIFT			12
+
+struct ad5529r_model_data {
+	const char *model_name;
+	unsigned int resolution;
+};
+
+#define AD5529R_DAC_CHANNEL(chan) ((struct iio_chan_spec) {		\
+	.type = IIO_VOLTAGE,						\
+	.indexed = 1,							\
+	.output = 1,							\
+	.channel = (chan),						\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |			\
+			      BIT(IIO_CHAN_INFO_SCALE) |		\
+			      BIT(IIO_CHAN_INFO_OFFSET),		\
+})
+
+static const char * const ad5529r_supply_names[] = {
+	"vdd",
+	"avdd",
+	"hvdd",
+};
+
+static const struct ad5529r_model_data ad5529r_16bit_model_data = {
+	.model_name = "ad5529r-16",
+	.resolution = 16,
+};
+
+static const struct ad5529r_model_data ad5529r_12bit_model_data = {
+	.model_name = "ad5529r-12",
+	.resolution = 12,
+};
+
+enum ad5529r_output_range {
+	AD5529R_RANGE_0V_5V,
+	AD5529R_RANGE_0V_10V,
+	AD5529R_RANGE_0V_20V,
+	AD5529R_RANGE_0V_40V,
+	AD5529R_RANGE_NEG5V_5V,
+	AD5529R_RANGE_NEG10V_10V,
+	AD5529R_RANGE_NEG15V_15V,
+	AD5529R_RANGE_NEG20V_20V,
+};
+
+static const s32 ad5529r_output_ranges_mV[8][2] = {
+	[AD5529R_RANGE_0V_5V] = { 0, 5000 },
+	[AD5529R_RANGE_0V_10V] = { 0, 10000 },
+	[AD5529R_RANGE_0V_20V] = { 0, 20000 },
+	[AD5529R_RANGE_0V_40V] = { 0, 40000 },
+	[AD5529R_RANGE_NEG5V_5V] = { -5000, 5000 },
+	[AD5529R_RANGE_NEG10V_10V] = { -10000, 10000 },
+	[AD5529R_RANGE_NEG15V_15V] = { -15000, 15000 },
+	[AD5529R_RANGE_NEG20V_20V] = { -20000, 20000 },
+};
+
+struct ad5529r_state {
+	struct spi_device *spi;
+	const struct ad5529r_model_data *model_data;
+	struct regmap *regmap_8bit;
+	struct regmap *regmap_16bit;
+	struct iio_chan_spec channels[16];
+	unsigned int num_channels;
+	enum ad5529r_output_range output_range_idx[16];
+};
+
+static const struct regmap_range ad5529r_8bit_readable_ranges[] = {
+	regmap_reg_range(AD5529R_REG_INTERFACE_CONFIG_A, AD5529R_REG_CHIP_GRADE),
+	regmap_reg_range(AD5529R_REG_SCRATCH_PAD, AD5529R_REG_VENDOR_H),
+	regmap_reg_range(AD5529R_REG_STREAM_MODE, AD5529R_REG_INTERFACE_STATUS_A),
+};
+
+static const struct regmap_range ad5529r_16bit_readable_ranges[] = {
+	regmap_reg_range(AD5529R_REG_MULTI_DAC_CH_SEL, AD5529R_REG_INIT_CRC_ERR_STAT),
+	regmap_reg_range(AD5529R_REG_MULTI_DAC_HOTPATH_SW_LDAC, AD5529R_MAX_REGISTER),
+};
+
+static const struct regmap_access_table ad5529r_8bit_readable_table = {
+	.yes_ranges = ad5529r_8bit_readable_ranges,
+	.n_yes_ranges = ARRAY_SIZE(ad5529r_8bit_readable_ranges),
+};
+
+static const struct regmap_access_table ad5529r_16bit_readable_table = {
+	.yes_ranges = ad5529r_16bit_readable_ranges,
+	.n_yes_ranges = ARRAY_SIZE(ad5529r_16bit_readable_ranges),
+};
+
+static const struct regmap_range ad5529r_8bit_read_only_ranges[] = {
+	regmap_reg_range(AD5529R_REG_DEVICE_CONFIG, AD5529R_REG_CHIP_GRADE),
+	regmap_reg_range(AD5529R_REG_SPI_REVISION, AD5529R_REG_VENDOR_H),
+};
+
+static const struct regmap_range ad5529r_16bit_read_only_ranges[] = {
+	regmap_reg_range(AD5529R_REG_DAC_DATA_READBACK_BASE,
+			 AD5529R_REG_DAC_DATA_READBACK_BASE + 15 * 2),
+	regmap_reg_range(AD5529R_REG_TSENS_ALERT_FLAG, AD5529R_REG_TSENS_SHTD_FLAG),
+	regmap_reg_range(AD5529R_REG_FUNC_BUSY, AD5529R_REG_FUNC_BUSY),
+	regmap_reg_range(AD5529R_REG_INIT_CRC_ERR_STAT, AD5529R_REG_INIT_CRC_ERR_STAT),
+};
+
+static const struct regmap_access_table ad5529r_8bit_writeable_table = {
+	.no_ranges = ad5529r_8bit_read_only_ranges,
+	.n_no_ranges = ARRAY_SIZE(ad5529r_8bit_read_only_ranges),
+};
+
+static const struct regmap_access_table ad5529r_16bit_writeable_table = {
+	.no_ranges = ad5529r_16bit_read_only_ranges,
+	.n_no_ranges = ARRAY_SIZE(ad5529r_16bit_read_only_ranges),
+};
+
+static struct regmap *ad5529r_get_regmap(struct ad5529r_state *st,
+					 unsigned int reg)
+{
+	if (reg <= AD5529R_8BIT_REG_MAX)
+		return st->regmap_8bit;
+
+	return st->regmap_16bit;
+}
+
+static int ad5529r_reset(struct ad5529r_state *st)
+{
+	struct reset_control *rst;
+	int ret;
+
+	rst = devm_reset_control_get_optional_exclusive(&st->spi->dev, NULL);
+	if (IS_ERR(rst))
+		return PTR_ERR(rst);
+
+	if (rst) {
+		ret = reset_control_assert(rst);
+		if (ret)
+			return ret;
+
+		/* Minimum reset low width (t_reset) is 20 ns per datasheet. */
+		ret = reset_control_deassert(rst);
+		if (ret)
+			return ret;
+	} else {
+		ret = regmap_write(st->regmap_8bit, AD5529R_REG_INTERFACE_CONFIG_A,
+				   AD5529R_INTERFACE_CONFIG_A_SW_RESET);
+		if (ret)
+			return ret;
+	}
+
+	/*
+	 * Wait 10 ms for digital initialization to complete.
+	 * Per datasheet, Interface Status A register NOT_READY_ERR bit is
+	 * set if SPI transactions are attempted before digital initialization
+	 * completes.
+	 */
+	fsleep(10 * USEC_PER_MSEC);
+
+	return regmap_write(st->regmap_8bit, AD5529R_REG_INTERFACE_CONFIG_A,
+			    AD5529R_INTERFACE_CONFIG_A_SDO_ENABLE |
+			    AD5529R_INTERFACE_CONFIG_A_ADDR_ASCENSION);
+}
+
+static int ad5529r_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
+{
+	struct ad5529r_state *st = iio_priv(indio_dev);
+	unsigned int reg_addr, reg_val_h;
+	int ret, range_idx, span_mv;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		/*
+		 * Read from DAC_INPUT_A register rather than DAC_DATA_READBACK.
+		 * The DAC operates in transparent mode and directly reflects
+		 * whatever value is written to the INPUT_A register.
+		 */
+		reg_addr = AD5529R_REG_DAC_INPUT_A(chan->channel);
+		ret = regmap_read(st->regmap_16bit, reg_addr, &reg_val_h);
+		if (ret)
+			return ret;
+
+		*val = reg_val_h;
+
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		range_idx = st->output_range_idx[chan->channel];
+
+		span_mv = ad5529r_output_ranges_mV[range_idx][1] -
+			  ad5529r_output_ranges_mV[range_idx][0];
+		*val = span_mv;
+		*val2 = st->model_data->resolution;
+
+		return IIO_VAL_FRACTIONAL_LOG2;
+	case IIO_CHAN_INFO_OFFSET:
+		range_idx = st->output_range_idx[chan->channel];
+
+		if (ad5529r_output_ranges_mV[range_idx][0] < 0)
+			*val = -(1 << (st->model_data->resolution - 1));
+		else
+			*val = 0;
+
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ad5529r_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long mask)
+{
+	struct ad5529r_state *st = iio_priv(indio_dev);
+	unsigned int reg_addr;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		if (val < 0 || val > GENMASK(st->model_data->resolution - 1, 0))
+			return -EINVAL;
+
+		reg_addr = AD5529R_REG_DAC_INPUT_A(chan->channel);
+
+		return regmap_write(st->regmap_16bit, reg_addr, val);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ad5529r_find_output_range(const s32 *vals)
+{
+	for (unsigned int i = 0; i < ARRAY_SIZE(ad5529r_output_ranges_mV); i++) {
+		const s32 *range = ad5529r_output_ranges_mV[i];
+
+		if (vals[0] == range[0] * (MICRO / MILLI) &&
+		    vals[1] == range[1] * (MICRO / MILLI))
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+static int ad5529r_parse_channel_ranges(struct device *dev,
+					struct ad5529r_state *st)
+{
+	s32 vals[2];
+	int ret, range_idx;
+	u32 ch;
+
+	device_for_each_child_node_scoped(dev, child) {
+		ret = fwnode_property_read_u32(child, "reg", &ch);
+		if (ret)
+			return dev_err_probe(dev, ret,
+					     "Missing reg property in channel node\n");
+
+		if (ch >= 16)
+			return dev_err_probe(dev, -EINVAL,
+					     "Channel %u exceeds maximum 15\n",
+					     ch);
+
+		if (fwnode_property_present(child, "output-range-microvolt")) {
+			/*
+			 * DT stores cells as raw 32-bit values; signed endpoints are
+			 * encoded by dtc in two's-complement and then interpreted
+			 * here as s32.
+			 */
+			ret = fwnode_property_read_u32_array(child,
+							     "output-range-microvolt",
+							     (u32 *)vals, ARRAY_SIZE(vals));
+			if (ret < 0)
+				return dev_err_probe(dev, ret,
+						     "Failed to read range for ch %u\n",
+						     ch);
+
+			range_idx = ad5529r_find_output_range(vals);
+			if (range_idx < 0)
+				return dev_err_probe(dev, range_idx,
+						     "Invalid range [%d %d] for ch %u\n",
+						     vals[0], vals[1], ch);
+		} else {
+			range_idx = AD5529R_RANGE_0V_5V;
+		}
+
+		st->output_range_idx[ch] = range_idx;
+		ret = regmap_write(st->regmap_16bit,
+				   AD5529R_REG_OUT_RANGE(ch), range_idx);
+		if (ret)
+			return dev_err_probe(dev, ret,
+					     "Failed to configure range for ch %u\n",
+					     ch);
+
+		st->channels[st->num_channels++] = AD5529R_DAC_CHANNEL(ch);
+	}
+
+	return 0;
+}
+
+static int ad5529r_reg_access(struct iio_dev *indio_dev,
+			      unsigned int reg,
+			      unsigned int writeval,
+			      unsigned int *readval)
+{
+	struct ad5529r_state *st = iio_priv(indio_dev);
+
+	if (readval)
+		return regmap_read(ad5529r_get_regmap(st, reg), reg, readval);
+
+	return regmap_write(ad5529r_get_regmap(st, reg), reg, writeval);
+}
+
+static const struct iio_info ad5529r_info = {
+	.read_raw = ad5529r_read_raw,
+	.write_raw = ad5529r_write_raw,
+	.debugfs_reg_access = ad5529r_reg_access,
+};
+
+static int ad5529r_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct iio_dev *indio_dev;
+	struct ad5529r_state *st;
+	struct regmap_config regmap_8bit_cfg;
+	struct regmap_config regmap_16bit_cfg;
+	bool external_vref;
+	u32 dev_addr = 0;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+
+	st->spi = spi;
+
+	st->model_data = spi_get_device_match_data(spi);
+	if (!st->model_data)
+		return dev_err_probe(dev, -EINVAL,
+				     "Failed to identify device variant\n");
+
+	device_property_read_u32(dev, "spi-device-addr", &dev_addr);
+	if (dev_addr > 3)
+		return dev_err_probe(dev, -EINVAL,
+				     "spi-device-addr %u out of range [0, 3]\n",
+				     dev_addr);
+
+	regmap_8bit_cfg = (struct regmap_config) {
+		.name = "ad5529r-8bit",
+		.reg_bits = 16,
+		.val_bits = 8,
+		.max_register = AD5529R_8BIT_REG_MAX,
+		.read_flag_mask = AD5529R_SPI_READ_FLAG,
+		.rd_table = &ad5529r_8bit_readable_table,
+		.wr_table = &ad5529r_8bit_writeable_table,
+		.reg_base = dev_addr << AD5529R_ADDR_SHIFT,
+	};
+	regmap_16bit_cfg = (struct regmap_config) {
+		.name = "ad5529r-16bit",
+		.reg_bits = 16,
+		.val_bits = 16,
+		.max_register = AD5529R_MAX_REGISTER,
+		.read_flag_mask = AD5529R_SPI_READ_FLAG,
+		.val_format_endian = REGMAP_ENDIAN_LITTLE,
+		.rd_table = &ad5529r_16bit_readable_table,
+		.wr_table = &ad5529r_16bit_writeable_table,
+		.reg_stride = 2,
+		.reg_base = dev_addr << AD5529R_ADDR_SHIFT,
+	};
+
+	ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(ad5529r_supply_names),
+					     ad5529r_supply_names);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to get and enable regulators\n");
+
+	ret = devm_regulator_get_enable_optional(dev, "hvss");
+	if (ret && ret != -ENODEV)
+		return dev_err_probe(dev, ret,
+				     "Failed to get and enable hvss regulator\n");
+
+	ret = devm_regulator_get_enable_optional(dev, "vref");
+	if (ret == -ENODEV)
+		external_vref = false;
+	else if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to get and enable vref regulator\n");
+	else
+		external_vref = true;
+
+	st->regmap_8bit = devm_regmap_init_spi(spi, &regmap_8bit_cfg);
+	if (IS_ERR(st->regmap_8bit))
+		return dev_err_probe(dev, PTR_ERR(st->regmap_8bit),
+				     "Failed to initialize 8-bit regmap\n");
+
+	st->regmap_16bit = devm_regmap_init_spi(spi, &regmap_16bit_cfg);
+	if (IS_ERR(st->regmap_16bit))
+		return dev_err_probe(dev, PTR_ERR(st->regmap_16bit),
+				     "Failed to initialize 16-bit regmap\n");
+
+	ret = ad5529r_reset(st);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to reset device\n");
+
+	ret = regmap_assign_bits(st->regmap_16bit, AD5529R_REG_REF_SEL,
+				 AD5529R_REF_SEL_INTERNAL_REF,
+				 external_vref ? 0 : AD5529R_REF_SEL_INTERNAL_REF);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to configure reference\n");
+
+	ret = ad5529r_parse_channel_ranges(dev, st);
+	if (ret)
+		return ret;
+
+	indio_dev->name = st->model_data->model_name;
+	indio_dev->info = &ad5529r_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = st->channels;
+	indio_dev->num_channels = st->num_channels;
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct of_device_id ad5529r_of_match[] = {
+	{ .compatible = "adi,ad5529r-16", .data = &ad5529r_16bit_model_data },
+	{ .compatible = "adi,ad5529r-12", .data = &ad5529r_12bit_model_data },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ad5529r_of_match);
+
+static const struct spi_device_id ad5529r_id[] = {
+	{
+		.name = "ad5529r-16",
+		.driver_data = (kernel_ulong_t)&ad5529r_16bit_model_data,
+	},
+	{
+		.name = "ad5529r-12",
+		.driver_data = (kernel_ulong_t)&ad5529r_12bit_model_data,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, ad5529r_id);
+
+static struct spi_driver ad5529r_driver = {
+	.driver = {
+		.name = "ad5529r",
+		.of_match_table = ad5529r_of_match,
+	},
+	.probe = ad5529r_probe,
+	.id_table = ad5529r_id,
+};
+module_spi_driver(ad5529r_driver);
+
+MODULE_AUTHOR("Janani Sunil <janani.sunil@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD5529R 12/16-bit DAC driver");
+MODULE_LICENSE("GPL");

-- 
2.43.0

Re: [PATCH v7 2/7] dt-bindings: iio: adc: microchip,mcp3564: Add spi-device-addr

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [High] The dt-binding introduces `spi-device-addr` to replace the deprecated `microchip,hw-device-address` and removes it from the required list, but the driver has not been updated to parse the new generic property.
--

--- Patch [2]: [PATCH v7 2/7] dt-bindings: iio: adc: microchip,mcp3564: Add spi-device-addr ---
commit a3bb549053e31953c445885e8d6cb1988514c7b0
Author: Janani Sunil <janani.sunil@analog.com>

dt-bindings: iio: adc: microchip,mcp3564: Add spi-device-addr
    
This commit introduces the generic spi-device-addr property to the mcp3564
binding. It also marks the existing vendor-specific 
microchip,hw-device-address property as deprecated and removes it from the 
required list.

> diff --git a/Documentation/devicetree/bindings/iio/adc/microchip,mcp3564.yaml b/Documentation/devicetree/bindings/iio/adc/microchip,mcp3564.yaml
> index 6753192761971..de1ea289e7f52 100644
> --- a/Documentation/devicetree/bindings/iio/adc/microchip,mcp3564.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/microchip,mcp3564.yaml
[ ... ]
> @@ -91,6 +92,12 @@ properties:
>        clocking of the device address (BITS[7:6] - top two bits of COMMAND BYTE
>        which is first one on the wire).
>  
> +  spi-device-addr:
> +    maxItems: 1
> +    items:
> +      enum: [0, 1, 2, 3]
> +    default: [1]
> +
>    "#io-channel-cells":
>      const: 1
[ ... ]
> @@ -123,7 +130,6 @@ dependencies:
>  required:
>    - compatible
>    - reg
> -  - microchip,hw-device-address
>    - spi-max-frequency
>  
>  allOf:

[Severity: High]
Since the old microchip,hw-device-address property is removed from the
required list here and replaced by spi-device-addr, does the mcp3564 driver
need an accompanying update to parse the new generic property?

Currently, if a device tree author updates their configuration to use the new
spi-device-addr property following this binding, mcp3564_config() still
explicitly checks only for the deprecated property and will silently fall
back to 0x1:

drivers/iio/adc/mcp3564.c:mcp3564_config() {
	unsigned int tmp = 0x01;
	...
	device_property_read_u32(dev, "microchip,hw-device-address", &tmp);
	...
}

Could this cause hardware state machine initialization and SPI communication
to fail for any device physically strapped to addresses 0, 2, or 3 if they
drop the old property?

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260722-ad5529r-driver-v7-0-7781cd74ad75@analog.com?part=2

Re: [PATCH v7 4/7] dt-bindings: iio: adc: microchip,mcp3911: Add spi-device-addr

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [High] The dt-bindings update deprecates `microchip,device-addr` in favor of the new generic `spi-device-addr` property, but the `mcp3911` driver was not updated to parse it. If a device tree uses the newly recommended `spi-device-addr` property, the driver will fail to parse it, fall back to device address 0, and fail to communicate with hardware configured for other addresses.
--

--- Patch [4]: [PATCH v7 4/7] dt-bindings: iio: adc: microchip,mcp3911: Add spi-device-addr ---
commit 9e6e246369fd97fd7587432780e30a16297f1eb0
Author: Janani Sunil <janani.sunil@analog.com>
dt-bindings: iio: adc: microchip,mcp3911: Add spi-device-addr

This commit adds the generic spi-device-addr property to the binding.
It also deprecates the existing vendor-specific microchip,device-addr
property.

> diff --git a/Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml b/Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml
> index 3a69ec60edb91..36da2bee1db28 100644
> --- a/Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml
> @@ -57,6 +57,13 @@ properties:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      enum: [0, 1, 2, 3]
>      default: 0
> +    deprecated: true
> +
> +  spi-device-addr:
> +    maxItems: 1
> +    items:
> +      enum: [0, 1, 2, 3]
> +    default: [0]

[Severity: High]
Is the driver updated to parse this new property?

Looking at mcp3911_probe() in drivers/iio/adc/mcp3911.c, the driver only
handles the deprecated properties:

	ret = device_property_read_u32(dev, "microchip,device-addr", &adc->dev_addr);
	if (ret)
		device_property_read_u32(dev, "device-addr", &adc->dev_addr);

If a modernized device tree uses the newly recommended spi-device-addr
property instead of microchip,device-addr, will the driver fail to parse it
and leave adc->dev_addr at 0?

Could this cause communication failures with hardware configured for non-zero
addresses?

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260722-ad5529r-driver-v7-0-7781cd74ad75@analog.com?part=4

Re: [PATCH v7 6/7] dt-bindings: iio: dac: Add AD5529R

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] The child node schema uses `additionalProperties: false` alongside a `$ref`, which incorrectly blocks valid properties from the referenced schema.
--

--- Patch [6]: [PATCH v7 6/7] dt-bindings: iio: dac: Add AD5529R ---
commit 7d0649d467110abde25b98986887b22fbe5ea358
Author: Janani Sunil <janani.sunil@analog.com>
Subject: dt-bindings: iio: dac: Add AD5529R

This commit introduces device tree bindings for the Analog Devices AD5529R, a
16-channel, 12-bit or 16-bit high voltage DAC. The bindings specify power
supplies, SPI interface parameters, GPIOs for reset and clear, and individual
channel configurations.

> diff --git a/Documentation/devicetree/bindings/iio/dac/adi,ad5529r.yaml b/Documentation/devicetree/bindings/iio/dac/adi,ad5529r.yaml
> new file mode 100644
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/dac/adi,ad5529r.yaml
[ ... ]
> +patternProperties:
> +  "^channel@([0-9a-f]{1,2})$":
> +    $ref: dac.yaml
> +    type: object
> +    description: Child nodes for individual channel configuration
[ ... ]
> +    required:
> +      - reg
> +
> +    additionalProperties: false

[Severity: Low]
Will using additionalProperties: false here block properties evaluated by the
$ref to dac.yaml? 

Standard DAC properties like label might fail validation during dtbs_check
when added to channel nodes. 

Should this be changed to unevaluatedProperties: false instead?

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260722-ad5529r-driver-v7-0-7781cd74ad75@analog.com?part=6

Re: [PATCH v7 7/7] iio: dac: Add AD5529R DAC driver support

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 2 potential issue(s) to consider:
- [High] Out-of-bounds array write in `ad5529r_parse_channel_ranges` due to missing bounds check on `st->num_channels`.
- [Medium] Missing required hardware delay between reset assertion and deassertion.
--

--- Patch [7]: [PATCH v7 7/7] iio: dac: Add AD5529R DAC driver support ---
commit 190cbf7d47fe0e91c8bbafb4dfea2a90c159fb6b
Author: Janani Sunil <janani.sunil@analog.com>

iio: dac: Add AD5529R DAC driver support

This commit adds support for the Analog Devices AD5529R 16-channel,
12/16 bit Digital to Analog Converter. The device communicates over SPI
and supports per-channel output range configuration.

> diff --git a/drivers/iio/dac/ad5529r.c b/drivers/iio/dac/ad5529r.c
> new file mode 100644
> index 0000000000000..2fd1dd053da58
> --- /dev/null
> +++ b/drivers/iio/dac/ad5529r.c
[ ... ]
> +static int ad5529r_reset(struct ad5529r_state *st)
> +{
> +	struct reset_control *rst;
> +	int ret;
> +
> +	rst = devm_reset_control_get_optional_exclusive(&st->spi->dev, NULL);
> +	if (IS_ERR(rst))
> +		return PTR_ERR(rst);
> +
> +	if (rst) {
> +		ret = reset_control_assert(rst);
> +		if (ret)
> +			return ret;
> +
> +		/* Minimum reset low width (t_reset) is 20 ns per datasheet. */
> +		ret = reset_control_deassert(rst);

[Severity: Medium]
Since the datasheet requires a minimum reset low width of 20 ns, should there
be a delay like ndelay(20) before deasserting the reset?

Back-to-back MMIO writes on fast hardware might toggle the reset line faster
than the required 20 ns.

> +		if (ret)
> +			return ret;
> +	} else {
[ ... ]
> +static int ad5529r_parse_channel_ranges(struct device *dev,
> +					struct ad5529r_state *st)
> +{
> +	s32 vals[2];
> +	int ret, range_idx;
> +	u32 ch;
> +
> +	device_for_each_child_node_scoped(dev, child) {
> +		ret = fwnode_property_read_u32(child, "reg", &ch);
> +		if (ret)
> +			return dev_err_probe(dev, ret,
> +					     "Missing reg property in channel node\n");
> +
> +		if (ch >= 16)
> +			return dev_err_probe(dev, -EINVAL,
> +					     "Channel %u exceeds maximum 15\n",
> +					     ch);
[ ... ]
> +		st->output_range_idx[ch] = range_idx;
> +		ret = regmap_write(st->regmap_16bit,
> +				   AD5529R_REG_OUT_RANGE(ch), range_idx);
> +		if (ret)
> +			return dev_err_probe(dev, ret,
> +					     "Failed to configure range for ch %u\n",
> +					     ch);
> +
> +		st->channels[st->num_channels++] = AD5529R_DAC_CHANNEL(ch);

[Severity: High]
Does this code risk an out-of-bounds array write to st->channels[]?

While the code checks if the individual 'reg' property 'ch' is less than 16,
it does not verify the total number of child nodes. If a malformed Device Tree
contains more than 16 child nodes (for instance, due to duplicate 'reg'
values), st->num_channels will exceed the fixed size of st->channels[16] and
corrupt adjacent memory.

> +	}
> +
> +	return 0;
> +}

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260722-ad5529r-driver-v7-0-7781cd74ad75@analog.com?part=7