Add "microchip,pic64hpsc-gem" for "PIC64-HPSC" and
"microchip,pic64hx-gem" for "PIC64HX", compatible with the former.

The generic compatible "cdns,gem" works but offers limited features.
Keep it as a fallback.

The GEM IPs within pic64hpsc have their MDIO controllers unconnected
from any physical pin. Add a check to prevent adding PHYs under the GEM
node.

Signed-off-by: Charles Perry <charles.perry@microchip.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
---
 .../devicetree/bindings/net/cdns,macb.yaml    | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/cdns,macb.yaml b/Documentation/devicetree/bindings/net/cdns,macb.yaml
index cb14c35ba996..feb168385837 100644
--- a/Documentation/devicetree/bindings/net/cdns,macb.yaml
+++ b/Documentation/devicetree/bindings/net/cdns,macb.yaml
@@ -70,6 +70,14 @@ properties:
               - microchip,sama7d65-gem   # Microchip SAMA7D65 gigabit ethernet interface
           - const: microchip,sama7g5-gem # Microchip SAMA7G5 gigabit ethernet interface
 
+      - items:
+          - const: microchip,pic64hpsc-gem # Microchip PIC64-HPSC
+          - const: cdns,gem
+      - items:
+          - const: microchip,pic64hx-gem   # Microchip PIC64HX
+          - const: microchip,pic64hpsc-gem # Microchip PIC64-HPSC
+          - const: cdns,gem
+
   reg:
     minItems: 1
     items:
@@ -196,6 +204,17 @@ allOf:
       required:
         - phys
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: microchip,pic64hpsc-gem
+    then:
+      patternProperties:
+        "^ethernet-phy@[0-9a-f]$": false
+      properties:
+        mdio: false
+
 unevaluatedProperties: false
 
 examples:
-- 
2.47.3

On Fri Mar 13, 2026 at 3:06 PM CET, Charles Perry wrote:
> Add "microchip,pic64hpsc-gem" for "PIC64-HPSC" and
> "microchip,pic64hx-gem" for "PIC64HX", compatible with the former.
>
> The generic compatible "cdns,gem" works but offers limited features.
> Keep it as a fallback.
>
> The GEM IPs within pic64hpsc have their MDIO controllers unconnected
> from any physical pin. Add a check to prevent adding PHYs under the GEM
> node.
>
> Signed-off-by: Charles Perry <charles.perry@microchip.com>
> Acked-by: Conor Dooley <conor.dooley@microchip.com>
> ---
>  .../devicetree/bindings/net/cdns,macb.yaml    | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)

Reviewed-by: Théo Lebrun <theo.lebrun@bootlin.com>

Thanks,

--
Théo Lebrun, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com