[PATCH v6 1/4] dt-bindings: can: rockchip: add rk3588 CAN-FD compatible

RK3588 integrates a Rockchip CAN-FD controller variant that is not
fully compatible with RK3568v2. The RX FIFO count register field is
encoded in bits 7:5 on RK3588, while RK3568v2 uses bits 6:4.

Add a dedicated rockchip,rk3588-canfd compatible to describe this
variant. Do not use rockchip,rk3568v2-canfd as a fallback, because that
would describe a register layout that does not match the hardware.

Reviewed-by: Heiko Stuebner <[email protected]>
Acked-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Cunhao Lu <[email protected]>
---
v3 -> v4:
- Collect Krzysztof's Acked-by tag.
v2 -> v3:
- Move the Changelog below ---
- Collect Heiko's Reviewed-by tag
v1 -> v2:
- Use enum for the single-compatible entries, as suggested by Krzysztof.
- Reword the commit message to explain the hardware difference instead
  of referring to Linux driver match data.
---
 .../devicetree/bindings/net/can/rockchip,rk3568v2-canfd.yaml          | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/can/rockchip,rk3568v2-canfd.yaml b/Documentation/devicetree/bindings/net/can/rockchip,rk3568v2-canfd.yaml
index a077c0330013..81e2b6dfeb02 100644
--- a/Documentation/devicetree/bindings/net/can/rockchip,rk3568v2-canfd.yaml
+++ b/Documentation/devicetree/bindings/net/can/rockchip,rk3568v2-canfd.yaml
@@ -16,7 +16,9 @@ allOf:
 properties:
   compatible:
     oneOf:
-      - const: rockchip,rk3568v2-canfd
+      - enum:
+          - rockchip,rk3568v2-canfd
+          - rockchip,rk3588-canfd
       - items:
           - const: rockchip,rk3568v3-canfd
           - const: rockchip,rk3568v2-canfd

-- 
2.34.1