[PATCH v3 1/2] dt-bindings: net: dsa: lantiq,gswip: add MaxLinear R(G)MII slew rate

["A. Sverdlin" <alexander.sverdlin@siemens.com>]

From: Alexander Sverdlin <alexander.sverdlin@siemens.com>

Add new slew-rate uint32 property. This property is only applicable for
ports in R(G)MII mode and allows for slew rate reduction in comparison to
"normal" default configuration with the purpose to reduce radiated
emissions.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
---
Changelog:
v3:
- use [pinctrl] standard "slew-rate" property as suggested by Rob
  https://lore.kernel.org/all/20251219204324.GA3881969-robh@kernel.org/
v2:
- unchanged

 .../devicetree/bindings/net/dsa/lantiq,gswip.yaml          | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
index 205b683849a53..277b121b159d5 100644
--- a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
@@ -111,6 +111,13 @@ patternProperties:
             description:
               Configure the RMII reference clock to be a clock output
               rather than an input. Only applicable for RMII mode.
+          slew-rate:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1]
+            description: |
+              Configure R(G)MII TXD/TXC pads' slew rate:
+              0: "normal"
+              1: "slow"
           tx-internal-delay-ps:
             enum: [0, 500, 1000, 1500, 2000, 2500, 3000, 3500]
             description:
-- 
2.52.0