[PATCH 1/2] dt-bindings: net: motorcomm: Add chip mode cfg

["Frank.Sae" <Frank.Sae@motor-comm.com>]

 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@motor-comm.com>
---
 .../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