dt-bindings: net: dsa: qca8k: support internal mdio-bus

This patch updates the qca8k's binding to document to the
approach for using the internal mdio-bus of the supported
qca8k switches.

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 64 insertions, 5 deletions

diff --git a/Documentation/devicetree/bindings/net/dsa/qca8k.txt b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
index 5eda99e6c86e..93a7469e70d4 100644
--- a/Documentation/devicetree/bindings/net/dsa/qca8k.txt
+++ b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
@@ -12,10 +12,15 @@ Required properties:
 Subnodes:
 
 The integrated switch subnode should be specified according to the binding
-described in dsa/dsa.txt. As the QCA8K switches do not have a N:N mapping of
-port and PHY id, each subnode describing a port needs to have a valid phandle
-referencing the internal PHY connected to it. The CPU port of this switch is
-always port 0.
+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.
+
+Don't use mixed external and internal mdio-bus configurations, as this is
+not supported by the hardware.
+
+The CPU port of this switch is always port 0.
 
 A CPU port node has the following optional node:
 
@@ -31,8 +36,9 @@ For QCA8K the 'fixed-link' sub-node supports only the following properties:
 - 'full-duplex' (boolean, optional), to indicate that full duplex is
   used. When absent, half duplex is assumed.
 
-Example:
+Examples:
 
+for the external mdio-bus configuration:
 
         &mdio0 {
                 phy_port1: phy@0 {
@@ -108,3 +114,56 @@ Example:
                         };
                 };
         };
+
+for the internal master mdio-bus configuration:
+
+        &mdio0 {
+                switch@10 {
+                        compatible = "qca,qca8337";
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+
+                        reg = <0x10>;
+
+                        ports {
+                                #address-cells = <1>;
+                                #size-cells = <0>;
+
+                                port@0 {
+                                        reg = <0>;
+                                        label = "cpu";
+                                        ethernet = <&gmac1>;
+                                        phy-mode = "rgmii";
+                                        fixed-link {
+                                                speed = 1000;
+                                                full-duplex;
+                                        };
+                                };
+
+                                port@1 {
+                                        reg = <1>;
+                                        label = "lan1";
+                                };
+
+                                port@2 {
+                                        reg = <2>;
+                                        label = "lan2";
+                                };
+
+                                port@3 {
+                                        reg = <3>;
+                                        label = "lan3";
+                                };
+
+                                port@4 {
+                                        reg = <4>;
+                                        label = "lan4";
+                                };
+
+                                port@5 {
+                                        reg = <5>;
+                                        label = "wan";
+                                };
+                        };
+                };
+        };