[PATCH 2/4] dt-bindings: arm: rockchip: Add FriendlyARM NanoPi M4B

[Chen-Yu Tsai]

From: Chen-Yu Tsai <wens@xxxxxxxx>

The NanoPi M4B is a minor revision of the original M4.

The differences against the original Nanopi M4 that are common with the
other M4V2 revision include:

  - microphone header removed
  - power button added
  - recovery button added

Additional changes specific to the M4B:

  - USB 3.0 hub removed; board now has 2x USB 3.0 type-A ports and 2x
    USB 2.0 ports
  - ADB toggle switch added; this changes the top USB 3.0 host port to
    a peripheral port
  - Type-C port no longer supports data or PD
  - WiFi/Bluetooth combo chip switched to AP6256, which supports BT 5.0
    but only 1T1R (down from 2T2R) for WiFi

Add a compatible string for the new board revision.

Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
---
 Documentation/devicetree/bindings/arm/rockchip.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/arm/rockchip.yaml b/Documentation/devicetree/bindings/arm/rockchip.yaml
index 37fd456170d2..1c0ec57ba860 100644
--- a/Documentation/devicetree/bindings/arm/rockchip.yaml
+++ b/Documentation/devicetree/bindings/arm/rockchip.yaml
@@ -126,6 +126,7 @@ properties:
           - enum:
               - friendlyarm,nanopc-t4
               - friendlyarm,nanopi-m4
+              - friendlyarm,nanopi-m4b
               - friendlyarm,nanopi-neo4
           - const: rockchip,rk3399
 
-- 
2.29.1