dt-bindings: net: cdns,macb: allow tsu_clk without tx_clk

Allow providing tsu_clk without a tx_clk as both are optional.

This is about relaxing unneeded constraints. It so happened that in the
past HW that needed a tsu_clk always needed a tx_clk.

Fixes: 4e5b6de ("dt-bindings: net: cdns,macb: Convert to json-schema")
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Nicolas Ferre <[email protected]>
Signed-off-by: Théo Lebrun <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: tleb

Documentation/devicetree/bindings/net/cdns,macb.yaml

@@ -85,7 +85,7 @@ properties:
     items:
       - enum: [ ether_clk, hclk, pclk ]
       - enum: [ hclk, pclk ]
-      - const: tx_clk
+      - enum: [ tx_clk, tsu_clk ]
       - enum: [ rx_clk, tsu_clk ]
       - const: tsu_clk