dt-bindings: soc: qcom: smd-rpm: add qcom,glink-channels

The Qualcomm Resource Power Manager (RPM) over SMD bindings contain
compatibles and description for RPM devices on two different
communication channels: SMD and GLINK.  Except the difference in the
parent node, they use different properties for describing name of
channel qcom,smd-channels or qcom,glink-channels.  The first one is
already present but second is missing:

  qcom/sm6125-sony-xperia-seine-pdx201.dtb: rpm-requests: 'qcom,glink-channels' does not match any of the regexes: '^regulators(-[01])?$', 'pinctrl-[0-9]+'
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220926092104.111449-2-krzysztof.kozlowski@linaro.org

Documentation/devicetree/bindings/soc/qcom/qcom,smd-rpm.yaml

@@ -4,7 +4,7 @@
 $id: "http://devicetree.org/schemas/soc/qcom/qcom,smd-rpm.yaml#"
 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
 
-title: Qualcomm Resource Power Manager (RPM) over SMD
+title: Qualcomm Resource Power Manager (RPM) over SMD/GLINK
 
 description: |
   This driver is used to interface with the Resource Power Manager (RPM) found
@@ -12,9 +12,9 @@ description: |
   to vote for state of the system resources, such as clocks, regulators and bus
   frequencies.
 
-  The SMD information for the RPM edge should be filled out.  See qcom,smd.yaml
-  for the required edge properties.  All SMD related properties will reside
-  within the RPM node itself.
+  The SMD or GLINK information for the RPM edge should be filled out.  See
+  qcom,smd.yaml for the required edge properties.  All SMD/GLINK related
+  properties will reside within the RPM node itself.
 
   The RPM exposes resources to its subnodes.  The rpm_requests node must be
   present and this subnode may contain children that designate regulator
@@ -55,6 +55,12 @@ properties:
   power-controller:
     $ref: /schemas/power/qcom,rpmpd.yaml#
 
+  qcom,glink-channels:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    description: Channel name used for the RPM communication
+    items:
+      - const: rpm_requests
+
   qcom,smd-channels:
     $ref: /schemas/types.yaml#/definitions/string-array
     description: Channel name used for the RPM communication
@@ -76,8 +82,15 @@ if:
           - qcom,rpm-msm8974
           - qcom,rpm-msm8953
 then:
+  properties:
+    qcom,glink-channels: false
   required:
     - qcom,smd-channels
+else:
+  properties:
+    qcom,smd-channels: false
+  required:
+    - qcom,glink-channels
 
 required:
   - compatible