Add support for the maxlinear,rmii-refclk-out boolean property on port
nodes to configure the RMII reference clock to be an output rather than
an input.

This property is only applicable for ports using RMII and allows the
switch to provide the reference clock for RMII-connected PHYs instead
of requiring an external clock source.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
index b0227b80716c..dd3858bad8ca 100644
--- a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
@@ -29,6 +29,11 @@ patternProperties:
             description:
               RGMII RX Clock Delay defined in pico seconds.
               The delay lines adjust the MII clock vs. data timing.
+          maxlinear,rmii-refclk-out:
+            type: boolean
+            description:
+              Configure the RMII reference clock to be a clock output
+              rather than an input. Only applicable for RMII mode.
 
 maintainers:
   - Hauke Mehrtens <hauke@hauke-m.de>
-- 
2.51.1