Hi Rob,

On Fri, Dec 17, 2021 at 08:18:06AM -0600, Rob Herring wrote:

On Fri, Dec 17, 2021 at 12:09:44AM +0200, Laurent Pinchart wrote:

quoted

From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Power supplies for the ports can be controlled per port depending on the
hardware design. Support per-port supplies in the DT bindings, mutually
exclusive with the global supply.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 .../bindings/media/i2c/maxim,max9286.yaml     | 25 ++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
index 02f656e78700..33aa307e8ee5 100644
--- a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
+++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml

@@ -39,7 +39,7 @@ properties:
     maxItems: 1
 
   poc-supply:
-    description: Regulator providing Power over Coax to the cameras
+    description: Regulator providing Power over Coax to all the ports
 
   enable-gpios:
     description: GPIO connected to the \#PWDN pin with inverted polarity

@@ -160,6 +160,10 @@ properties:
 
             additionalProperties: false
 
+patternProperties:
+  "^port[0-3]-poc-supply$":
+    description: Regulator providing Power over Coax for a particular port
+
 required:
   - compatible
   - reg

@@ -167,6 +171,25 @@ required:
   - i2c-mux
   - gpio-controller
 
+allOf:
+  - if:
+      required:
+        - poc-supply
+    then:
+      allOf:
+        - not:
+            required:
+              - port0-poc-supply
+        - not:
+            required:
+              - port1-poc-supply
+        - not:
+            required:
+              - port2-poc-supply
+        - not:
+            required:
+              - port3-poc-supply

I think you can invert the if and move patternProperties to the 'then' 
and...

quoted

+
 additionalProperties: false

then use unevaluatedProperties here.

I ended up doing the following, which I would have sworn I had tried
before:

allOf:
  - if:
      required:
        - poc-supply
    then:
      patternProperties:
        '^port[0-3]-poc-supply$': false

additionalProperties: false

It seems to work, so I'll use it in v2.

-- 
Regards,

Laurent Pinchart