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From:   <alexandru.tachici@analog.com>
To:     <linux-iio@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <devicetree@vger.kernel.org>
CC:     <jic23@kernel.org>, <robh+dt@kernel.org>
Subject: [PATCH 2/2] dt-bindings: iio: adc: ad7124: add config nodes
Date:   Thu, 4 Feb 2021 11:10:45 +0200
Message-ID: <20210204091045.4175-3-alexandru.tachici@analog.com>
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From: Alexandru Tachici <alexandru.tachici@analog.com>

Document use of configurations in device-tree bindings.

Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
---
 .../bindings/iio/adc/adi,ad7124.yaml          | 72 +++++++++++++++----
 1 file changed, 57 insertions(+), 15 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7124.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7124.yaml
index fb3d0dae9bae..330064461d0a 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7124.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7124.yaml
@@ -62,20 +62,19 @@ required:
   - interrupts
 
 patternProperties:
-  "^channel@([0-9]|1[0-5])$":
-    $ref: "adc.yaml"
+  "^config@(2[0-7])$":
     type: object
     description: |
-      Represents the external channels which are connected to the ADC.
+      Represents a channel configuration.
+      See Documentation/devicetree/bindings/iio/adc/adc.txt.
 
     properties:
       reg:
         description: |
-          The channel number. It can have up to 8 channels on ad7124-4
-          and 16 channels on ad7124-8, numbered from 0 to 15.
+          The config number. It can have up to 8 configuration.
         items:
-          minimum: 0
-          maximum: 15
+         minimum: 20
+         maximum: 27
 
       adi,reference-select:
         description: |
@@ -88,8 +87,6 @@ patternProperties:
         $ref: /schemas/types.yaml#/definitions/uint32
         enum: [0, 1, 3]
 
-      diff-channels: true
-
       bipolar: true
 
       adi,buffered-positive:
@@ -100,6 +97,35 @@ patternProperties:
         description: Enable buffered mode for negative input.
         type: boolean
 
+    additionalProperties: false
+
+  "^channel@([0-9]|1[0-5])$":
+    type: object
+    description: |
+      Represents the external channels which are connected to the ADC.
+      See Documentation/devicetree/bindings/iio/adc/adc.txt.
+
+    properties:
+      reg:
+        description: |
+          The channel number. It can have up to 8 channels on ad7124-4
+          and 16 channels on ad7124-8, numbered from 0 to 15.
+        items:
+         minimum: 0
+         maximum: 15
+
+      diff-channels: true
+
+      adi,configuration:
+        description: |
+          The devices has 8 configuration and ad7124-8 support up to 16 unipolar channels.
+          Each channel can be assigned one configuration. Some channels will be sharing the
+          same configuration.
+        allOf:
+          - $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 20
+        maximum: 27
+
     required:
       - reg
       - diff-channels
@@ -127,30 +153,46 @@ examples:
         #address-cells = <1>;
         #size-cells = <0>;
 
-        channel@0 {
-          reg = <0>;
-          diff-channels = <0 1>;
+        config@20 {
+          reg = <20>;
           adi,reference-select = <0>;
           adi,buffered-positive;
         };
 
-        channel@1 {
-          reg = <1>;
+        config@21 {
+          reg = <21>;
           bipolar;
-          diff-channels = <2 3>;
           adi,reference-select = <0>;
           adi,buffered-positive;
           adi,buffered-negative;
         };
 
+        config@22 {
+          reg = <22>;
+        };
+
+        channel@0 {
+          reg = <0>;
+          diff-channels = <0 1>;
+          adi,configuration = <20>;
+        };
+
+        channel@1 {
+          reg = <1>;
+          diff-channels = <2 3>;
+          adi,configuration = <21>;
+        };
+
         channel@2 {
           reg = <2>;
           diff-channels = <4 5>;
+          adi,configuration = <22>;
         };
 
         channel@3 {
           reg = <3>;
           diff-channels = <6 7>;
+          adi,configuration = <22>;
         };
       };
     };
-- 
2.20.1