summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/net/dsa/dsa.txt
blob: a62c889aafcaf070774bc3e9bc93c96ba9ea1992 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
Marvell Distributed Switch Architecture Device Tree Bindings
------------------------------------------------------------

Required properties:
- compatible		: Should be "marvell,dsa"
- #address-cells	: Must be 2, first cell is the address on the MDIO bus
			  and second cell is the address in the switch tree.
			  Second cell is used only when cascading/chaining.
- #size-cells		: Must be 0
- dsa,ethernet		: Should be a phandle to a valid Ethernet device node
- dsa,mii-bus		: Should be a phandle to a valid MDIO bus device node

Optionnal properties:
- interrupts		: property with a value describing the switch
			  interrupt number (not supported by the driver)

A DSA node can contain multiple switch chips which are therefore child nodes of
the parent DSA node. The maximum number of allowed child nodes is 4
(DSA_MAX_SWITCHES).
Each of these switch child nodes should have the following required properties:

- reg			: Describes the switch address on the MII bus
- #address-cells	: Must be 1
- #size-cells		: Must be 0

A switch may have multiple "port" children nodes

Each port children node must have the following mandatory properties:
- reg			: Describes the port address in the switch
- label			: Describes the label associated with this port, special
			  labels are "cpu" to indicate a CPU port and "dsa" to
			  indicate an uplink/downlink port.

Note that a port labelled "dsa" will imply checking for the uplink phandle
described below.

Optionnal property:
- link			: Should be a phandle to another switch's DSA port.
			  This property is only used when switches are being
			  chained/cascaded together.

- phy-handle		: Phandle to a PHY on an external MDIO bus, not the
			  switch internal one. See
			  Documentation/devicetree/bindings/net/ethernet.txt
			  for details.

- phy-mode		: String representing the connection to the designated
			  PHY node specified by the 'phy-handle' property. See
			  Documentation/devicetree/bindings/net/ethernet.txt
			  for details.

Optional subnodes:
- fixed-link		: Fixed-link subnode describing a link to a non-MDIO
			  managed entity. See
			  Documentation/devicetree/bindings/net/fixed-link.txt
			  for details.

Example:

	dsa@0 {
		compatible = "marvell,dsa";
		#address-cells = <2>;
		#size-cells = <0>;

		interrupts = <10>;
		dsa,ethernet = <&ethernet0>;
		dsa,mii-bus = <&mii_bus0>;

		switch@0 {
			#address-cells = <1>;
			#size-cells = <0>;
			reg = <16 0>;	/* MDIO address 16, switch 0 in tree */

			port@0 {
				reg = <0>;
				label = "lan1";
				phy-handle = <&phy0>;
			};

			port@1 {
				reg = <1>;
				label = "lan2";
			};

			port@5 {
				reg = <5>;
				label = "cpu";
			};

			switch0uplink: port@6 {
				reg = <6>;
				label = "dsa";
				link = <&switch1uplink>;
			};
		};

		switch@1 {
			#address-cells = <1>;
			#size-cells = <0>;
			reg = <17 1>;	/* MDIO address 17, switch 1 in tree */

			switch1uplink: port@0 {
				reg = <0>;
				label = "dsa";
				link = <&switch0uplink>;
			};
		};
	};