dt-bindings: can: renesas,rcar-canfd: R-Car V3U is R-Car Gen4

Despite the name, R-Car V3U is the first member of the R-Car Gen4
family.  Hence generalize this by introducing a family-specific
compatible value for R-Car Gen4.

While at it, replace "both channels" by "all channels", as the numbers
of channels may differ from two.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/all/4dea4b7dd76d4f859ada85f97094b7adeef5169f.1674499048.git.geert+renesas@glider.beSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml

@@ -28,6 +28,11 @@ properties:
               - renesas,r8a77995-canfd     # R-Car D3
           - const: renesas,rcar-gen3-canfd # R-Car Gen3 and RZ/G2
 
+      - items:
+          - enum:
+              - renesas,r8a779a0-canfd     # R-Car V3U
+          - const: renesas,rcar-gen4-canfd # R-Car Gen4
+
       - items:
           - enum:
               - renesas,r9a07g043-canfd    # RZ/G2UL and RZ/Five
@@ -35,8 +40,6 @@ properties:
               - renesas,r9a07g054-canfd    # RZ/V2L
           - const: renesas,rzg2l-canfd     # RZ/G2L family
 
-      - const: renesas,r8a779a0-canfd      # R-Car V3U
-
   reg:
     maxItems: 1
 
@@ -60,7 +63,7 @@ properties:
     $ref: /schemas/types.yaml#/definitions/flag
     description:
       The controller can operate in either CAN FD only mode (default) or
-      Classical CAN only mode.  The mode is global to both the channels.
+      Classical CAN only mode.  The mode is global to all channels.
       Specify this property to put the controller in Classical CAN only mode.
 
   assigned-clocks:
@@ -159,7 +162,7 @@ allOf:
         properties:
           compatible:
             contains:
-              const: renesas,r8a779a0-canfd
+              const: renesas,rcar-gen4-canfd
     then:
       patternProperties:
         "^channel[2-7]$": false