dt-bindings: spmi: Add qcom,bus-id

For PMIC arbiter version 7 and beyond we need to define if we are using
primary or secondary bus, so add a new property of qcom,bus-id

Signed-off-by: Vinod Koul <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Reviewed-by: Bjorn Andersson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb.yaml

···
     description: >
       which of the PMIC Arb provided channels to use for accesses
 
+  qcom,bus-id:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 1
+    description: >
+      SPMI bus instance. only applicable to PMIC arbiter version 7 and beyond.
+      Supported values, 0 = primary bus, 1 = secondary bus
+
 required:
   - compatible
   - reg-names
···
 
         interrupt-controller;
         #interrupt-cells = <4>;
+
+        qcom,bus-id = <0>;
     };