spi: dt-bindings: cdns,qspi-nor: Require some peripheral properties

There are 5 mandatory peripheral properties. They are described in a
separate binding but not explicitly required. Make sure they are
correctly marked required and update the example to reflect this.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250319094651.1290509-4-miquel.raynal@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml

@@ -146,6 +146,18 @@ properties:
     items:
       enum: [ qspi, qspi-ocp, rstc_ref ]
 
+patternProperties:
+  "^flash@[0-9a-f]+$":
+    type: object
+    $ref: cdns,qspi-nor-peripheral-props.yaml
+    additionalProperties: true
+    required:
+      - cdns,read-delay
+      - cdns,tshsl-ns
+      - cdns,tsd2d-ns
+      - cdns,tchsh-ns
+      - cdns,tslch-ns
+
 required:
   - compatible
   - reg
@@ -177,5 +189,10 @@ examples:
         flash@0 {
             compatible = "jedec,spi-nor";
             reg = <0x0>;
+            cdns,read-delay = <4>;
+            cdns,tshsl-ns = <60>;
+            cdns,tsd2d-ns = <60>;
+            cdns,tchsh-ns = <60>;
+            cdns,tslch-ns = <60>;
         };
     };