[RFC PATCH 02/10] dt-bindings: phy: rockchip: naneng-combphy: add rockchip,sgmii-mac-sel property

On RK3568, the SGMII interface can be routed to either GMAC0 or
GMAC1 via the pipe_sgmii_mac_sel bit in the pipe GRF registers.

Add the optional "rockchip,sgmii-mac-sel" property to allow the
device tree to select which GMAC controller is used for SGMII.

The property takes a value of 0 (GMAC0) or 1 (GMAC1), with 0 being
the default.

This is necessary for boards such as the Ariaboard Photonicat, where
the SGMII interface is connected to GMAC0 and needs to be explicitly
configured.

Signed-off-by: Coia Prant <redacted>
---
 .../bindings/phy/phy-rockchip-naneng-combphy.yaml          | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/phy-rockchip-naneng-combphy.yaml b/Documentation/devicetree/bindings/phy/phy-rockchip-naneng-combphy.yaml
index 379b08bd9e97a..6173192e31ab2 100644
--- a/Documentation/devicetree/bindings/phy/phy-rockchip-naneng-combphy.yaml
+++ b/Documentation/devicetree/bindings/phy/phy-rockchip-naneng-combphy.yaml

@@ -80,6 +80,13 @@ properties:
     description:
       Some additional pipe settings are accessed through GRF regs.
 
+  rockchip,sgmii-mac-sel:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1]
+    default: 0
+    description:
+      Select gmac0 or gmac1 to be used as SGMII controller.
+
   "#phy-cells":
     const: 1
 

-- 
2.47.3