dt-bindings: power: add rk3568-pmu-io-domain support

Add binding for the RK3568 along a SoC-specific description of
voltage supplies.

Signed-off-by: Jianqun Xu <[e-mail]>
[add soc-specific section]
Signed-off-by: Michael Riesch <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Heiko Stuebner <[e-mail]>

Documentation/devicetree/bindings/power/rockchip-io-domain.yaml

···
       - rockchip,rk3368-pmu-io-voltage-domain
       - rockchip,rk3399-io-voltage-domain
       - rockchip,rk3399-pmu-io-voltage-domain
+      - rockchip,rk3568-pmu-io-voltage-domain
       - rockchip,rv1108-io-voltage-domain
       - rockchip,rv1108-pmu-io-voltage-domain
 
···
   - $ref: "#/$defs/rk3368-pmu"
   - $ref: "#/$defs/rk3399"
   - $ref: "#/$defs/rk3399-pmu"
+  - $ref: "#/$defs/rk3568-pmu"
   - $ref: "#/$defs/rv1108"
   - $ref: "#/$defs/rv1108-pmu"
 
···
       properties:
         pmu1830-supply:
           description: The supply connected to PMUIO2_VDD.
+
+  rk3568-pmu:
+    if:
+      properties:
+        compatible:
+          contains:
+            const: rockchip,rk3568-pmu-io-voltage-domain
+
+    then:
+      properties:
+        pmuio1-supply:
+          description: The supply connected to PMUIO1.
+        pmuio2-supply:
+          description: The supply connected to PMUIO2.
+        vccio1-supply:
+          description: The supply connected to VCCIO1.
+        vccio2-supply:
+          description: The supply connected to VCCIO2.
+        vccio3-supply:
+          description: The supply connected to VCCIO3.
+        vccio4-supply:
+          description: The supply connected to VCCIO4.
+        vccio5-supply:
+          description: The supply connected to VCCIO5.
+        vccio6-supply:
+          description: The supply connected to VCCIO6.
+        vccio7-supply:
+          description: The supply connected to VCCIO7.
 
   rv1108:
     if:

Documentation/devicetree/bindings/soc/rockchip/grf.yaml

···
               - rockchip,rk3368-pmugrf
               - rockchip,rk3399-grf
               - rockchip,rk3399-pmugrf
+              - rockchip,rk3568-pmugrf
               - rockchip,rv1108-grf
               - rockchip,rv1108-pmugrf