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net: dsa: mv88e6xxx: Support multiple MDIO busses

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The mv88e6390 has multiple MDIO busses. Generalize the parsing of the
device tree to support multiple mdio nodes. The external mdio bus has
a compatible strings to indicate it is external.

Keep a linked list of busses, placing the external mdio bus at the
tail of the list. When within the driver an mdio bus is needed,
e.g. for EEE or SERDES, use the head of the list which should be the
internal bus.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn
2017-01-24 14:53:50 +01:00
committed by David S. Miller
parent 0dd12d54c4
commit a3c53be55c
3 changed files with 128 additions and 37 deletions
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41
Documentation/devicetree/bindings/net/dsa/marvell.txt
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@@ -26,8 +26,12 @@ Optional properties:
- interrupt-controller : Indicates the switch is itself an interrupt
controller. This is used for the PHY interrupts.
#interrupt-cells = <2> : Controller uses two cells, number and flag
- mdio : container of PHY and devices on the switches MDIO
bus
- mdio : Container of PHY and devices on the switches MDIO
bus.
- mdio? : Container of PHYs and devices on the external MDIO
bus. The node must contains a compatible string of
"marvell,mv88e6xxx-mdio-external"
Example:
mdio {
@@ -53,3 +57,36 @@ Example:
};
};
};
mdio {
#address-cells = <1>;
#size-cells = <0>;
interrupt-parent = <&gpio0>;
interrupts = <27 IRQ_TYPE_LEVEL_LOW>;
interrupt-controller;
#interrupt-cells = <2>;
switch0: switch@0 {
compatible = "marvell,mv88e6390";
reg = <0>;
reset-gpios = <&gpio5 1 GPIO_ACTIVE_LOW>;
};
mdio {
#address-cells = <1>;
#size-cells = <0>;
switch1phy0: switch1phy0@0 {
reg = <0>;
interrupt-parent = <&switch0>;
interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
};
};
mdio1 {
compatible = "marvell,mv88e6xxx-mdio-external";
#address-cells = <1>;
#size-cells = <0>;
switch1phy9: switch1phy0@9 {
reg = <9>;
};
};
};