[PATCH v4 2/7] dt-bindings: net: dsa: mediatek,mt7530: describe 'passthrough' hierarchy

[Caleb James DeLisle]

Due to hardware limitations, full switch hierarchies are not supported
with DSA based on the mt7530 DSA tag, however it does support a simplified
hierarchy in which one or more switches act as passthrough conduits with
only one CPU port and one DSA port active. Document this capability.

Signed-off-by: Caleb James DeLisle <cjd at cjdns.fr>
---
 .../devicetree/bindings/net/dsa/mediatek,mt7530.yaml         | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
index 90b3582b7619..f98b9113ad12 100644
--- a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
@@ -73,6 +73,11 @@ description: |
 
       Check out example 7.
 
+  The MT7530 and MT7531 switches offer limited support for switch hierarchies,
+  particularly in the case where one or more switches have only one upstream
+  and one downstream port, and can act as blind pass-throughs to a fully
+  featured switch downstream.
+
 properties:
   compatible:
     oneOf:
-- 
2.39.5