The motorcomm phy (yt8821) supports the ability to
config the chip mode of serdes.
The yt8821 serdes could be set to AUTO_BX2500_SGMII or
FORCE_BX2500.
In AUTO_BX2500_SGMII mode, SerDes
speed is determined by UTP, if UTP link up
at 2.5GBASE-T, SerDes will work as
2500BASE-X, if UTP link up at
1000BASE-T/100BASE-Tx/10BASE-T, SerDes will work
as SGMII.
In FORCE_BX2500, SerDes always works
as 2500BASE-X.
Signed-off-by: Frank.Sae <Frank.Sae@xxxxxxxxxxxxxx>
---
.../bindings/net/motorcomm,yt8xxx.yaml | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml b/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
index 26688e2302ea..ba34260f889d 100644
--- a/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
+++ b/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
@@ -110,6 +110,23 @@ properties:
Transmit PHY Clock delay train configuration when speed is 1000Mbps.
type: boolean
+ motorcomm,chip-mode:
+ description: |
+ Only for yt8821 2.5G phy, it supports two chip working modes,
+ one is AUTO_BX2500_SGMII, the other is FORCE_BX2500.
+ If this property is not set in device tree node then driver
+ selects chip mode FORCE_BX2500 by default.
+ 0: AUTO_BX2500_SGMII
+ 1: FORCE_BX2500
+ In AUTO_BX2500_SGMII mode, serdes speed is determined by UTP,
+ if UTP link up at 2.5GBASE-T, serdes will work as 2500BASE-X,
+ if UTP link up at 1000BASE-T/100BASE-Tx/10BASE-T, serdes will
+ work as SGMII.
+ In FORCE_BX2500 mode, serdes always works as 2500BASE-X.
+ $ref: /schemas/types.yaml#/definitions/uint8
+ enum: [ 0, 1 ]
+ default: 1
+
unevaluatedProperties: false
examples:
--
2.25.1
