dt-bindings: pinctrl: qcom,tlmm-common: add common check for function

Certain pins, like SDcard related, do not have functions and such should
not be required. Add a check for this in common Qualcomm TLMM pin
controller schema.

Reviewed-by: Bjorn Andersson <[e-mail]>
Reviewed-by: Stephan Gerhold <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

Documentation/devicetree/bindings/pinctrl/qcom,tlmm-common.yaml

···
 
 $defs:
   qcom-tlmm-state:
-    allOf:
-      - $ref: pincfg-node.yaml#
-      - $ref: pinmux-node.yaml#
-
     properties:
       drive-strength:
         enum: [2, 4, 6, 8, 10, 12, 14, 16]
···
       input-enable: true
       output-high: true
       output-low: true
+
+    allOf:
+      - $ref: pincfg-node.yaml#
+      - $ref: pinmux-node.yaml#
+
+      - if:
+          properties:
+            pins:
+              items:
+                pattern: "^gpio"
+        then:
+          required:
+            - function
+        else:
+          properties:
+            function: false
 
     additionalProperties: true
 ...