[PATCH v3 0/1] dt-bindings: iio: adc: add AD7816/AD7817/AD7818 binding

[PATCH v3 0/1] dt-bindings: iio: adc: add AD7816/AD7817/AD7818 binding

[Hungyu Lin]

Changes in v3:
- Fix commit message based on input from Sanjay Chitroda

Changes in v2:
- Fix commit message to match binding requirements

Hungyu Lin (1):
  dt-bindings: iio: adc: add AD7816/AD7817/AD7818 binding

 .../bindings/iio/adc/adi,ad7816.yaml          | 94 +++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7816.yaml

-- 
2.34.1

[PATCH v3 1/1] dt-bindings: iio: adc: add AD7816/AD7817/AD7818 binding

[Hungyu Lin]

Add Device Tree binding documentation for the Analog Devices
AD7816, AD7817 and AD7818 SPI ADC devices.

The AD7816 provides temperature monitoring only, while the
AD7817 and AD7818 provide analog input channels with an
on-chip temperature sensor.

The devices use control GPIOs for RD/WR and CONVST. BUSY is required for
AD7816 and AD7817 variants.

Signed-off-by: Hungyu Lin <dennylin0707@gmail.com>
---
Changes in v3:
- Fix commit message to match binding requirements
- Fix commit message based on input from Sanjay Chitroda
---
 .../bindings/iio/adc/adi,ad7816.yaml          | 94 +++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7816.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7816.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7816.yaml
new file mode 100644
index 000000000000..490e5338d7b2
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7816.yaml
@@ -0,0 +1,94 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7816.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD7816/AD7817/AD7818 ADC
+
+maintainers:
+  - Hungyu Lin <dennylin0707@gmail.com>
+
+description: |
+  Binding for Analog Devices AD7816, AD7817 and AD7818 SPI ADCs
+  with on-chip temperature sensor.
+
+  The AD7816 provides temperature monitoring only.
+  The AD7817 provides up to 4 analog input channels.
+  The AD7818 provides a single analog input channel.
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7816
+      - adi,ad7817
+      - adi,ad7818
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+    description:
+      Optional interrupt line used by the device.
+
+  rdwr-gpios:
+    maxItems: 1
+    description:
+      GPIO connected to the RD/WR pin used to control read/write cycles.
+
+  convert-gpios:
+    maxItems: 1
+    description:
+      GPIO connected to the CONVST pin used to trigger conversions.
+
+  busy-gpios:
+    maxItems: 1
+    description:
+      GPIO connected to the BUSY pin indicating conversion status.
+
+required:
+  - compatible
+  - reg
+  - rdwr-gpios
+  - convert-gpios
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - adi,ad7816
+              - adi,ad7817
+    then:
+      required:
+        - busy-gpios
+    else:
+      properties:
+        busy-gpios: false
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    gpio0: gpio {
+      gpio-controller;
+      #gpio-cells = <2>;
+    };
+
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      adc@0 {
+        compatible = "adi,ad7816";
+        reg = <0>;
+        spi-max-frequency = <5000000>;
+        rdwr-gpios = <&gpio0 1 0>;
+        convert-gpios = <&gpio0 2 0>;
+        busy-gpios = <&gpio0 3 0>;
+      };
+    };
-- 
2.34.1

Re: [PATCH v3 1/1] dt-bindings: iio: adc: add AD7816/AD7817/AD7818 binding

[David Lechner]

On 5/8/26 9:27 PM, Hungyu Lin wrote:
> Add Device Tree binding documentation for the Analog Devices
> AD7816, AD7817 and AD7818 SPI ADC devices.
> 
Why are we adding bindings without a driver to use them?

Re: [PATCH v3 0/1] dt-bindings: iio: adc: add AD7816/AD7817/AD7818 binding

[David Lechner]

On 5/8/26 9:27 PM, Hungyu Lin wrote:
> Changes in v3:
> - Fix commit message based on input from Sanjay Chitroda
> 
> Changes in v2:
> - Fix commit message to match binding requirements
> 
> Hungyu Lin (1):
>   dt-bindings: iio: adc: add AD7816/AD7817/AD7818 binding
> 
>  .../bindings/iio/adc/adi,ad7816.yaml          | 94 +++++++++++++++++++
>  1 file changed, 94 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7816.yaml
> 

Don't need a cover letter for a single patch. Just put
this after --- in the commit message of the patch.

Re: [PATCH v3 1/1] dt-bindings: iio: adc: add AD7816/AD7817/AD7818 binding

[Denny Lin]

Hi David,

> Why are we adding bindings without a driver to use them?

There is already a driver for these devices in
drivers/staging/iio/adc/ad7816.c, which includes OF match entries
for "adi,ad7816", "adi,ad7817", and "adi,ad7818".

This binding is intended to document the existing DT interface.

Thanks,
Hungyu

On Sat, May 9, 2026 at 3:13 PM David Lechner <dlechner@baylibre.com> wrote:
>
> On 5/8/26 9:27 PM, Hungyu Lin wrote:
> > Add Device Tree binding documentation for the Analog Devices
> > AD7816, AD7817 and AD7818 SPI ADC devices.
> >
> Why are we adding bindings without a driver to use them?