dt-bindings: soc: bcm: bcm2835-pm: Introduce reg-names

Anticipating the introduction of BCM2711, of which we'll need to support
its new RPiVid ASB, introduce reg-names into bcm2835-pm's binding. This
will help to have a consistent mapping between resources and their
meaning.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.yaml

@@ -23,9 +23,13 @@ properties:
       - const: brcm,bcm2835-pm-wdt
 
   reg:
+    minItems: 2
+    maxItems: 2
+
+  reg-names:
     items:
-      - description: PM registers
-      - description: ASB registers
+      - const: pm
+      - const: asb
 
   "#power-domain-cells":
     const: 1
@@ -68,6 +72,7 @@ examples:
         #reset-cells = <1>;
         reg = <0x7e100000 0x114>,
               <0x7e00a000 0x24>;
+        reg-names = "pm", "asb";
         clocks = <&clocks BCM2835_CLOCK_V3D>,
                <&clocks BCM2835_CLOCK_PERI_IMAGE>,
                <&clocks BCM2835_CLOCK_H264>,