linux-kernel - [PATCH v8 6/8] dt-bindings: iio: adc: adi,ad4030: Add ADAQ4216 and ADAQ4224

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Message-ID: <61719f774d7a372819642670591c03dfcd0dc107.1770403407.git.marcelo.schmitt@analog.com>
Date: Fri, 6 Feb 2026 16:01:56 -0300
From: Marcelo Schmitt <marcelo.schmitt@...log.com>
To: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <jic23@...nel.org>, <michael.hennerich@...log.com>, <nuno.sa@...log.com>,
        <eblanc@...libre.com>, <dlechner@...libre.com>, <andy@...nel.org>,
        <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <corbet@....net>, <marcelo.schmitt1@...il.com>,
        Conor Dooley
	<conor.dooley@...rochip.com>
Subject: [PATCH v8 6/8] dt-bindings: iio: adc: adi,ad4030: Add ADAQ4216 and ADAQ4224

ADAQ4216 and ADAQ4224 are similar to AD4030 except that ADAQ devices have a
PGA (programmable gain amplifier) that scales the input signal prior to it
reaching the ADC inputs. The PGA is controlled through a couple of pins (A0
and A1) that set one of four possible signal gain configurations.

Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
---
Change log v7 -> v8
- Fixed issues reported by dt_binding_check.

 .../bindings/iio/adc/adi,ad4030.yaml          | 58 +++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml
index a135c66142df..08b1f9d75f89 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml
@@ -19,6 +19,8 @@ description: |
   * https://www.analog.com/media/en/technical-documentation/data-sheets/ad4030-24-4032-24.pdf
   * https://www.analog.com/media/en/technical-documentation/data-sheets/ad4630-24_ad4632-24.pdf
   * https://www.analog.com/media/en/technical-documentation/data-sheets/ad4630-16-4632-16.pdf
+  * https://www.analog.com/media/en/technical-documentation/data-sheets/adaq4216.pdf
+  * https://www.analog.com/media/en/technical-documentation/data-sheets/adaq4224.pdf
 
 $ref: /schemas/spi/spi-peripheral-props.yaml#
 
@@ -31,6 +33,8 @@ properties:
       - adi,ad4630-24
       - adi,ad4632-16
       - adi,ad4632-24
+      - adi,adaq4216
+      - adi,adaq4224
 
   reg:
     maxItems: 1
@@ -62,6 +66,14 @@ properties:
     description:
       Internal buffered Reference. Used when ref-supply is not connected.
 
+  vddh-supply:
+    description:
+      PGIA Positive Power Supply.
+
+  vdd-fda-supply:
+    description:
+      FDA Positive Power Supply.
+
   cnv-gpios:
     description:
       The Convert Input (CNV). It initiates the sampling conversions.
@@ -72,6 +84,13 @@ properties:
       The Reset Input (/RST). Used for asynchronous device reset.
     maxItems: 1
 
+  pga-gpios:
+    description:
+      A0 and A1 pins for gain selection. For devices that have PGA configuration
+      input pins, pga-gpios should be defined.
+    minItems: 2
+    maxItems: 2
+
   pwms:
     description: PWM signal connected to the CNV pin.
     maxItems: 1
@@ -113,6 +132,22 @@ allOf:
       properties:
         spi-rx-bus-width:
           maxItems: 1
+  # ADAQ devices require a gain property to indicate how hardware PGA is set
+  - if:
+      properties:
+        compatible:
+          contains:
+            pattern: ^adi,adaq
+    then:
+      required:
+        - vddh-supply
+        - vdd-fda-supply
+        - pga-gpios
+      properties:
+        ref-supply: false
+    else:
+      properties:
+        pga-gpios: false
 
 examples:
   - |
@@ -154,3 +189,26 @@ examples:
             reset-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
         };
     };
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "adi,adaq4216";
+            reg = <0>;
+            spi-max-frequency = <80000000>;
+            vdd-5v-supply = <&supply_5V>;
+            vdd-1v8-supply = <&supply_1_8V>;
+            vio-supply = <&supply_1_8V>;
+            refin-supply = <&refin_sup>;
+            vddh-supply = <&vddh>;
+            vdd-fda-supply = <&vdd_fda>;
+            cnv-gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
+            reset-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
+            pga-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>,
+                        <&gpio0 3 GPIO_ACTIVE_HIGH>;
+        };
+    };
-- 
2.39.2