From 61379d4d883cf92a53a7b7294aaa4ff8fb4ce276 Mon Sep 17 00:00:00 2001
From: Flaviu Nistor <flaviu.nistor@gmail.com>
Date: Wed, 26 Aug 2026 21:47:48 +0300
Subject: [PATCH] dt-bindings: hwmon: national,lm90: Fix channel constraints
 for temperature offset

Limit temperature-offset-millicelsius to remote channels only, since
channel 0 is local and this property does not apply to it.
Channel 2 is only valid on devices with two remote sensors, so reject
channel 2 for compatibles that do not support a second remote channel.

Signed-off-by: Flaviu Nistor <flaviu.nistor@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260826184750.4798-2-flaviu.nistor@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 .../bindings/hwmon/national,lm90.yaml         | 28 +++++++++++++++++--
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/hwmon/national,lm90.yaml b/Documentation/devicetree/bindings/hwmon/national,lm90.yaml
index 164068ba069d..a8b2a24501b3 100644
--- a/Documentation/devicetree/bindings/hwmon/national,lm90.yaml
+++ b/Documentation/devicetree/bindings/hwmon/national,lm90.yaml
@@ -113,6 +113,23 @@ allOf:
       properties:
         ti,extended-range-enable: false
 
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - adi,adt7481
+                - dallas,max6695
+                - dallas,max6696
+    then:
+      patternProperties:
+        "^channel@[0-1]$":
+          properties:
+            reg:
+              enum: [0, 1]
+        "channel@2": false
+
   - if:
       properties:
         compatible:
@@ -134,6 +151,11 @@ allOf:
         "^channel@([0-2])$":
           properties:
             temperature-offset-millicelsius: false
+    else:
+      patternProperties:
+        "channel@0":
+          properties:
+            temperature-offset-millicelsius: false
 
   - if:
       properties:
@@ -149,7 +171,7 @@ allOf:
               - onnn,nct1008
     then:
       patternProperties:
-        "^channel@([0-2])$":
+        "^channel@([1-2])$":
           properties:
             temperature-offset-millicelsius:
               maximum: 127750
@@ -172,7 +194,7 @@ allOf:
               - winbond,w83l771
     then:
       patternProperties:
-        "^channel@([0-2])$":
+        "^channel@([1-2])$":
           properties:
             temperature-offset-millicelsius:
               maximum: 127875
@@ -186,7 +208,7 @@ allOf:
               - ti,tmp461
     then:
       patternProperties:
-        "^channel@([0-2])$":
+        "^channel@([1-2])$":
           properties:
             temperature-offset-millicelsius:
               maximum: 127937