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

Add new maxlinear,slew-rate-txc and maxlinear,slew-rate-txd uint32
properties. The properties are only applicable for ports in R(G)MII mode
and allow 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:
v5:
- improved options' descriptions on Rob's suggestions
v4:
- separate properties for TXD and TXC pads ("maxlinear," prefix re-appears)
v3:
- use [pinctrl] standard "slew-rate" property as suggested by Rob
  https://lore.kernel.org/all/20251219204324.GA3881969-robh@kernel.org/
v2:
- unchanged

 .../bindings/net/dsa/lantiq,gswip.yaml        | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
index 205b683849a53..37d64b8a76ac7 100644
--- a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
@@ -106,6 +106,28 @@ patternProperties:
         unevaluatedProperties: false
 
         properties:
+          maxlinear,slew-rate-txc:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1]
+            description: |
+              RMII/RGMII TX Clock Slew Rate:
+
+                0: Normal
+                1: Slow
+
+              If not present, the configuration made by the switch bootloader is
+              preserved.
+          maxlinear,slew-rate-txd:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1]
+            description: |
+              RMII/RGMII TX Non-Clock PAD Slew Rate:
+
+                0: Normal
+                1: Slow
+
+              If not present, the configuration made by the switch bootloader is
+              preserved.
           maxlinear,rmii-refclk-out:
             type: boolean
             description:
-- 
2.52.0

On Wed, 14 Jan 2026 11:45:03 +0100, A. Sverdlin wrote:
> From: Alexander Sverdlin <alexander.sverdlin@siemens.com>
> 
> Add new maxlinear,slew-rate-txc and maxlinear,slew-rate-txd uint32
> properties. The properties are only applicable for ports in R(G)MII mode
> and allow 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:
> v5:
> - improved options' descriptions on Rob's suggestions
> v4:
> - separate properties for TXD and TXC pads ("maxlinear," prefix re-appears)
> v3:
> - use [pinctrl] standard "slew-rate" property as suggested by Rob
>   https://lore.kernel.org/all/20251219204324.GA3881969-robh@kernel.org/
> v2:
> - unchanged
> 
>  .../bindings/net/dsa/lantiq,gswip.yaml        | 22 +++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>