On Wed, 2020-08-19 at 00:24 +0800, Vladimir Oltean wrote:

On Tue, Aug 18, 2020 at 03:14:12PM +0800, Landen Chao wrote:

quoted

Add mt7531 dsa to bananapi-bpi-r64 board for 5 giga Ethernet ports support.

Signed-off-by: Landen Chao <redacted>
---
 .../dts/mediatek/mt7622-bananapi-bpi-r64.dts  | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts b/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
index d174ad214857..c57b2571165f 100644
--- a/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts

@@ -143,6 +143,50 @@
 	mdio: mdio-bus {
 		#address-cells = <1>;
 		#size-cells = <0>;
+
+		switch@0 {
+			compatible = "mediatek,mt7531";
+

[snip]

quoted

+				port@6 {
+					reg = <6>;
+					label = "cpu";
+					ethernet = <&gmac0>;
+					phy-mode = "2500base-x";
+				};

Is there any reason why you're not specifying a fixed-link node here?

I got the below feedback in v1, so I follow the DSA common design in v2.
v2 can work with fixed-link node or without fixed-link node in CPU port
node.

  "This fixed-link should not be needed. The DSA driver is supposed to
   configure the CPU port to its fastest speed by default. 2500 is
   the fastest speed a 2500Base-X link can do..."

quoted

+			};
+		};
+
 	};
 };
 
-- 
2.17.1

Thanks,
-Vladimir