linux-kernel - [PATCH v3 1/4] dt-bindings: iio: adc: ad7768-1: add new supported parts

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Message-ID: <46842d4cf2c1149bd64188f94c60ce5e4f3b2beb.1757001160.git.Jonathan.Santos@analog.com>
Date: Fri, 5 Sep 2025 06:49:11 -0300
From: Jonathan Santos <Jonathan.Santos@...log.com>
To: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: Jonathan Santos <Jonathan.Santos@...log.com>, <lars@...afoo.de>,
        <jic23@...nel.org>, <dlechner@...libre.com>, <nuno.sa@...log.com>,
        <andy@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <marcelo.schmitt1@...il.com>,
        <jonath4nns@...il.com>
Subject: [PATCH v3 1/4] dt-bindings: iio: adc: ad7768-1: add new supported parts

Add compatibles for supported parts in the ad7768-1 family:
	ADAQ7767-1, ADAQ7768-1 and ADAQ7769-1

Add property and checks for AFF gain, supported by ADAQ7767-1
and ADAQ7769-1 parts:
	adi,aaf-gain-bp

Signed-off-by: Jonathan Santos <Jonathan.Santos@...log.com>
---
v3 Changes:
* Renamed adi,gain-milli to adi,aaf-gain-bp. Now it represents basis points
  (one hundredth of a percent) as suggested by Krzysztof. Description was
  adjusted.
  Note: permille (1/1000) was also suggested as unit for this property.

v2 Changes:
* adi,aaf-gain property renamed to adi,gain-milli. Description was 
  simplified.
* default value add to adi,gain-milli.
---
 .../bindings/iio/adc/adi,ad7768-1.yaml        | 44 +++++++++++++++++--
 1 file changed, 40 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml
index c06d0fc791d3..c2ad8e585586 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml
@@ -4,18 +4,26 @@
 $id: http://devicetree.org/schemas/iio/adc/adi,ad7768-1.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Analog Devices AD7768-1 ADC device driver
+title: Analog Devices AD7768-1 ADC family
 
 maintainers:
   - Michael Hennerich <michael.hennerich@...log.com>
 
 description: |
-  Datasheet at:
-    https://www.analog.com/media/en/technical-documentation/data-sheets/ad7768-1.pdf
+  Analog Devices AD7768-1 24-Bit Single Channel Low Power sigma-delta ADC family
+
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7768-1.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/adaq7767-1.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/adaq7768-1.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/adaq7769-1.pdf
 
 properties:
   compatible:
-    const: adi,ad7768-1
+    enum:
+      - adi,ad7768-1
+      - adi,adaq7767-1
+      - adi,adaq7768-1
+      - adi,adaq7769-1
 
   reg:
     maxItems: 1
@@ -58,6 +66,19 @@ properties:
     description:
       ADC reference voltage supply
 
+  adi,aaf-gain-bp:
+    description: |
+       Specifies the gain applied by the Analog Anti-Aliasing Filter (AAF)
+       to the ADC input in basis points (one hundredth of a percent).
+       The hardware gain is determined by which input pin(s) the signal goes
+       through into the AAF. The possible connections are:
+       * For the ADAQ7767-1: Input connected to IN1±, IN2± or IN3±.
+       * For the ADAQ7769-1: OUT_PGA pin connected to IN1_AAF+, IN2_AAF+,
+         or IN3_AAF+.
+    $ref: /schemas/types.yaml#/definitions/uint16
+    enum: [1430, 3640, 10000]
+    default: 10000
+
   adi,sync-in-gpios:
     maxItems: 1
     description:
@@ -147,6 +168,21 @@ patternProperties:
 allOf:
   - $ref: /schemas/spi/spi-peripheral-props.yaml#
 
+  # AAF Gain property only applies to ADAQ7767-1 and ADAQ7769-1 devices
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - adi,adaq7767-1
+              - adi,adaq7769-1
+    then:
+      required:
+        - adi,aaf-gain-bp
+    else:
+      properties:
+        adi,aaf-gain-bp: false
+
 unevaluatedProperties: false
 
 examples:
-- 
2.34.1