linux-kernel - [RFC PATCH net-next v5 21/25] devicetree: bindings: dsa: qca8k: Document internal mdio definition

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Date:   Tue, 11 May 2021 04:04:56 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS), linux-kernel@...r.kernel.org (open list)
Cc:     Ansuel Smith <ansuelsmth@...il.com>
Subject: [RFC PATCH net-next v5 21/25] devicetree: bindings: dsa: qca8k: Document internal mdio definition

Document new way of declare mapping of internal PHY to port.
The new implementation directly declare the PHY connected to the port
by adding a node in the switch node. The driver detect this and register
an internal mdiobus using the mapping defined in the mdio node.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 .../devicetree/bindings/net/dsa/qca8k.txt     | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/qca8k.txt b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
index 1daf68e7ae19..3973a9d3e426 100644
--- a/Documentation/devicetree/bindings/net/dsa/qca8k.txt
+++ b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
@@ -21,6 +21,10 @@ described in dsa/dsa.txt. If the QCA8K switch is connect to a SoC's external
 mdio-bus each subnode describing a port needs to have a valid phandle
 referencing the internal PHY it is connected to. This is because there's no
 N:N mapping of port and PHY id.
+To declare the internal mdio-bus configuration, declare a mdio node in the
+switch node and declare the phandle for the port referencing the internal
+PHY is connected to. In this config a internal mdio-bus is registred and
+the mdio MASTER is used as communication.
 
 Don't use mixed external and internal mdio-bus configurations, as this is
 not supported by the hardware.
@@ -150,26 +154,61 @@ for the internal master mdio-bus configuration:
 				port@1 {
 					reg = <1>;
 					label = "lan1";
+					phy-mode = "internal";
+					phy-handle = <&phy_port1>;
 				};
 
 				port@2 {
 					reg = <2>;
 					label = "lan2";
+					phy-mode = "internal";
+					phy-handle = <&phy_port2>;
 				};
 
 				port@3 {
 					reg = <3>;
 					label = "lan3";
+					phy-mode = "internal";
+					phy-handle = <&phy_port3>;
 				};
 
 				port@4 {
 					reg = <4>;
 					label = "lan4";
+					phy-mode = "internal";
+					phy-handle = <&phy_port4>;
 				};
 
 				port@5 {
 					reg = <5>;
 					label = "wan";
+					phy-mode = "internal";
+					phy-handle = <&phy_port5>;
+				};
+			};
+
+			mdio {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				phy_port1: phy@0 {
+					reg = <0>;
+				};
+
+				phy_port2: phy@1 {
+					reg = <1>;
+				};
+
+				phy_port3: phy@2 {
+					reg = <2>;
+				};
+
+				phy_port4: phy@3 {
+					reg = <3>;
+				};
+
+				phy_port5: phy@4 {
+					reg = <4>;
 				};
 			};
 		};
-- 
2.30.2