Documentation/devicetree/bindings/net/dsa/dsa.txt - linux-imx - Git at Google

 Distributed Switch Architecture Device Tree Bindings
 ----------------------------------------------------

 Two bindings exist, one of which has been deprecated due to
 limitations.

 Current Binding
 ---------------

 Switches are true Linux devices and can be probes by any means. Once
 probed, they register to the DSA framework, passing a node
 pointer. This node is expected to fulfil the following binding, and
 may contain additional properties as required by the device it is
 embedded within.

 Required properties:

 - ports		: A container for child nodes representing switch ports.

 Optional properties:

 - dsa,member	: A two element list indicates which DSA cluster, and position
 		  within the cluster a switch takes. <0 0> is cluster 0,
 		  switch 0. <0 1> is cluster 0, switch 1. <1 0> is cluster 1,
 		  switch 0. A switch not part of any cluster (single device
 		  hanging off a CPU port) must not specify this property

 The ports container has the following properties

 Required properties:

 - #address-cells	: Must be 1
 - #size-cells		: Must be 0

 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, which
                           will become the netdev name. Special labels are
 			  "cpu" to indicate a CPU port and "dsa" to
 			  indicate an uplink/downlink port between switches in
 			  the cluster.

 A port labelled "dsa" has the following mandatory property:

 - link			: Should be a list of phandles to other switch's DSA
 			  port. This port is used as the outgoing port
 			  towards the phandle ports. The full routing
 			  information must be given, not just the one hop
 			  routes to neighbouring switches.

 A port labelled "cpu" has the following mandatory property:

 - ethernet		: Should be a phandle to a valid Ethernet device node.
                           This host device is what the switch port is
 			  connected to.

 Port child nodes may also contain the following optional standardised
 properties, described in binding documents:

 - phy-handle		: Phandle to a PHY on an MDIO bus. See
 			  Documentation/devicetree/bindings/net/ethernet.txt
 			  for details.

 - phy-mode		: See
 			  Documentation/devicetree/bindings/net/ethernet.txt
 			  for details.

 - 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

 The following example shows three switches on three MDIO busses,
 linked into one DSA cluster.

 &mdio1 {
 	#address-cells = <1>;
 	#size-cells = <0>;

 	switch0: switch0@0 {
 		compatible = "marvell,mv88e6085";
 		#address-cells = <1>;
 		#size-cells = <0>;
 		reg = <0>;

 		dsa,member = <0 0>;

 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			port@0 {
 				reg = <0>;
 				label = "lan0";
 			};

 			port@1 {
 				reg = <1>;
 				label = "lan1";
 			};

 			port@2 {
 				reg = <2>;
 				label = "lan2";
 			};

 			switch0port5: port@5 {
 				reg = <5>;
 				label = "dsa";
 				phy-mode = "rgmii-txid";
 				link = <&switch1port6
 					&switch2port9>;
 				fixed-link {
 					speed = <1000>;
 					full-duplex;
 				};
 			};

 			port@6 {
 				reg = <6>;
 				label = "cpu";
 				ethernet = <&fec1>;
 				fixed-link {
 					speed = <100>;
 					full-duplex;
 				};
 			};
 		};
 	};
 };

 &mdio2 {
 	#address-cells = <1>;
 	#size-cells = <0>;

 	switch1: switch1@0 {
 		compatible = "marvell,mv88e6085";
 		#address-cells = <1>;
 		#size-cells = <0>;
 		reg = <0>;

 		dsa,member = <0 1>;

 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			port@0 {
 				reg = <0>;
 				label = "lan3";
 				phy-handle = <&switch1phy0>;
 			};

 			port@1 {
 				reg = <1>;
 				label = "lan4";
 				phy-handle = <&switch1phy1>;
 			};

 			port@2 {
 				reg = <2>;
 				label = "lan5";
 				phy-handle = <&switch1phy2>;
 			};

 			switch1port5: port@5 {
 				reg = <5>;
 				label = "dsa";
 				link = <&switch2port9>;
 				phy-mode = "rgmii-txid";
 				fixed-link {
 					speed = <1000>;
 					full-duplex;
 				};
 			};

 			switch1port6: port@6 {
 				reg = <6>;
 				label = "dsa";
 				phy-mode = "rgmii-txid";
 				link = <&switch0port5>;
 				fixed-link {
 					speed = <1000>;
 					full-duplex;
 				};
 			};
 		};
 		mdio-bus {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			switch1phy0: switch1phy0@0 {
 				reg = <0>;
 			};
 			switch1phy1: switch1phy0@1 {
 				reg = <1>;
 			};
 			switch1phy2: switch1phy0@2 {
 				reg = <2>;
 			};
 		};
 	 };
 };

 &mdio4 {
 	#address-cells = <1>;
 	#size-cells = <0>;

 	switch2: switch2@0 {
 		compatible = "marvell,mv88e6085";
 		#address-cells = <1>;
 		#size-cells = <0>;
 		reg = <0>;

 		dsa,member = <0 2>;

 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			port@0 {
 				reg = <0>;
 				label = "lan6";
 			};

 			port@1 {
 				reg = <1>;
 				label = "lan7";
 			};

 			port@2 {
 				reg = <2>;
 				label = "lan8";
 			};

 			port@3 {
 				reg = <3>;
 				label = "optical3";
 				fixed-link {
 					speed = <1000>;
 					full-duplex;
 					link-gpios = <&gpio6 2
 					      GPIO_ACTIVE_HIGH>;
 				};
 			};

 			port@4 {
 				reg = <4>;
 				label = "optical4";
 				fixed-link {
 					speed = <1000>;
 					full-duplex;
 					link-gpios = <&gpio6 3
 					      GPIO_ACTIVE_HIGH>;
 				};
 			};

 			switch2port9: port@9 {
 				reg = <9>;
 				label = "dsa";
 				phy-mode = "rgmii-txid";
 				link = <&switch1port5
 					&switch0port5>;
 				fixed-link {
 					speed = <1000>;
 					full-duplex;
 				};
 			};
 		};
 	};
 };

 Deprecated Binding
 ------------------

 The deprecated binding makes use of a platform device to represent the
 switches. The switches themselves are not Linux devices, and make use
 of an MDIO bus for management.

 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

 Optional 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			: Contains two fields. The first one describes the
 			  address on the MII bus. The second is the switch
 			  number that must be unique in cascaded configurations
 - #address-cells	: Must be 1
 - #size-cells		: Must be 0

 A switch child node has the following optional property:

 - eeprom-length		: Set to the length of an EEPROM connected to the
 			  switch. Must be set if the switch can not detect
 			  the presence and/or size of a connected EEPROM,
 			  otherwise optional.

 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.

 Optional property:
 - link			: Should be a list of phandles to another switch's DSA port.
 			  This property is only used when switches are being
 			  chained/cascaded together. This port is used as outgoing port
 			  towards the phandle port, which can be more than one hop away.

 - 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.

 - mii-bus		: Should be a phandle to a valid MDIO bus device node.
 			  This mii-bus will be used in preference to the
 			  global dsa,mii-bus defined above, for this switch.

 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";
 			};

 			switch0port6: port@6 {
 				reg = <6>;
 				label = "dsa";
 				link = <&switch1port0
 				        &switch2port0>;
 			};
 		};

 		switch@1 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			reg = <17 1>;	/* MDIO address 17, switch 1 in tree */
 			mii-bus = <&mii_bus1>;
 			reset-gpios = <&gpio5 1 GPIO_ACTIVE_LOW>;

 			switch1port0: port@0 {
 				reg = <0>;
 				label = "dsa";
 				link = <&switch0port6>;
 			};
 			switch1port1: port@1 {
 				reg = <1>;
 				label = "dsa";
 				link = <&switch2port1>;
 			};
 		};

 		switch@2 {
 			#address-cells = <1>;
 			#size-cells = <0>;
 			reg = <18 2>;	/* MDIO address 18, switch 2 in tree */
 			mii-bus = <&mii_bus1>;

 			switch2port0: port@0 {
 				reg = <0>;
 				label = "dsa";
 				link = <&switch1port1
 				        &switch0port6>;
 			};
 		};
 	};
	Distributed Switch Architecture Device Tree Bindings
	----------------------------------------------------

	Two bindings exist, one of which has been deprecated due to
	limitations.

	Current Binding
	---------------

	Switches are true Linux devices and can be probes by any means. Once
	probed, they register to the DSA framework, passing a node
	pointer. This node is expected to fulfil the following binding, and
	may contain additional properties as required by the device it is
	embedded within.

	Required properties:

	- ports : A container for child nodes representing switch ports.

	Optional properties:

	- dsa,member : A two element list indicates which DSA cluster, and position
	within the cluster a switch takes. <0 0> is cluster 0,
	switch 0. <0 1> is cluster 0, switch 1. <1 0> is cluster 1,
	switch 0. A switch not part of any cluster (single device
	hanging off a CPU port) must not specify this property

	The ports container has the following properties

	Required properties:

	- #address-cells : Must be 1
	- #size-cells : Must be 0

	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, which
	will become the netdev name. Special labels are
	"cpu" to indicate a CPU port and "dsa" to
	indicate an uplink/downlink port between switches in
	the cluster.

	A port labelled "dsa" has the following mandatory property:

	- link : Should be a list of phandles to other switch's DSA
	port. This port is used as the outgoing port
	towards the phandle ports. The full routing
	information must be given, not just the one hop
	routes to neighbouring switches.

	A port labelled "cpu" has the following mandatory property:

	- ethernet : Should be a phandle to a valid Ethernet device node.
	This host device is what the switch port is
	connected to.

	Port child nodes may also contain the following optional standardised
	properties, described in binding documents:

	- phy-handle : Phandle to a PHY on an MDIO bus. See
	Documentation/devicetree/bindings/net/ethernet.txt
	for details.

	- phy-mode : See
	Documentation/devicetree/bindings/net/ethernet.txt
	for details.

	- 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

	The following example shows three switches on three MDIO busses,
	linked into one DSA cluster.

	&mdio1 {
	#address-cells = <1>;
	#size-cells = <0>;

	switch0: switch0@0 {
	compatible = "marvell,mv88e6085";
	#address-cells = <1>;
	#size-cells = <0>;
	reg = <0>;

	dsa,member = <0 0>;

	ports {
	#address-cells = <1>;
	#size-cells = <0>;
	port@0 {
	reg = <0>;
	label = "lan0";
	};

	port@1 {
	reg = <1>;
	label = "lan1";
	};

	port@2 {
	reg = <2>;
	label = "lan2";
	};

	switch0port5: port@5 {
	reg = <5>;
	label = "dsa";
	phy-mode = "rgmii-txid";
	link = <&switch1port6
	&switch2port9>;
	fixed-link {
	speed = <1000>;
	full-duplex;
	};
	};

	port@6 {
	reg = <6>;
	label = "cpu";
	ethernet = <&fec1>;
	fixed-link {
	speed = <100>;
	full-duplex;
	};
	};
	};
	};
	};

	&mdio2 {
	#address-cells = <1>;
	#size-cells = <0>;

	switch1: switch1@0 {
	compatible = "marvell,mv88e6085";
	#address-cells = <1>;
	#size-cells = <0>;
	reg = <0>;

	dsa,member = <0 1>;

	ports {
	#address-cells = <1>;
	#size-cells = <0>;
	port@0 {
	reg = <0>;
	label = "lan3";
	phy-handle = <&switch1phy0>;
	};

	port@1 {
	reg = <1>;
	label = "lan4";
	phy-handle = <&switch1phy1>;
	};

	port@2 {
	reg = <2>;
	label = "lan5";
	phy-handle = <&switch1phy2>;
	};

	switch1port5: port@5 {
	reg = <5>;
	label = "dsa";
	link = <&switch2port9>;
	phy-mode = "rgmii-txid";
	fixed-link {
	speed = <1000>;
	full-duplex;
	};
	};

	switch1port6: port@6 {
	reg = <6>;
	label = "dsa";
	phy-mode = "rgmii-txid";
	link = <&switch0port5>;
	fixed-link {
	speed = <1000>;
	full-duplex;
	};
	};
	};
	mdio-bus {
	#address-cells = <1>;
	#size-cells = <0>;
	switch1phy0: switch1phy0@0 {
	reg = <0>;
	};
	switch1phy1: switch1phy0@1 {
	reg = <1>;
	};
	switch1phy2: switch1phy0@2 {
	reg = <2>;
	};
	};
	};
	};

	&mdio4 {
	#address-cells = <1>;
	#size-cells = <0>;

	switch2: switch2@0 {
	compatible = "marvell,mv88e6085";
	#address-cells = <1>;
	#size-cells = <0>;
	reg = <0>;

	dsa,member = <0 2>;

	ports {
	#address-cells = <1>;
	#size-cells = <0>;
	port@0 {
	reg = <0>;
	label = "lan6";
	};

	port@1 {
	reg = <1>;
	label = "lan7";
	};

	port@2 {
	reg = <2>;
	label = "lan8";
	};

	port@3 {
	reg = <3>;
	label = "optical3";
	fixed-link {
	speed = <1000>;
	full-duplex;
	link-gpios = <&gpio6 2
	GPIO_ACTIVE_HIGH>;
	};
	};

	port@4 {
	reg = <4>;
	label = "optical4";
	fixed-link {
	speed = <1000>;
	full-duplex;
	link-gpios = <&gpio6 3
	GPIO_ACTIVE_HIGH>;
	};
	};

	switch2port9: port@9 {
	reg = <9>;
	label = "dsa";
	phy-mode = "rgmii-txid";
	link = <&switch1port5
	&switch0port5>;
	fixed-link {
	speed = <1000>;
	full-duplex;
	};
	};
	};
	};
	};

	Deprecated Binding
	------------------

	The deprecated binding makes use of a platform device to represent the
	switches. The switches themselves are not Linux devices, and make use
	of an MDIO bus for management.

	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

	Optional 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 : Contains two fields. The first one describes the
	address on the MII bus. The second is the switch
	number that must be unique in cascaded configurations
	- #address-cells : Must be 1
	- #size-cells : Must be 0

	A switch child node has the following optional property:

	- eeprom-length : Set to the length of an EEPROM connected to the
	switch. Must be set if the switch can not detect
	the presence and/or size of a connected EEPROM,
	otherwise optional.

	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.

	Optional property:
	- link : Should be a list of phandles to another switch's DSA port.
	This property is only used when switches are being
	chained/cascaded together. This port is used as outgoing port
	towards the phandle port, which can be more than one hop away.

	- 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.

	- mii-bus : Should be a phandle to a valid MDIO bus device node.
	This mii-bus will be used in preference to the
	global dsa,mii-bus defined above, for this switch.

	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";
	};

	switch0port6: port@6 {
	reg = <6>;
	label = "dsa";
	link = <&switch1port0
	&switch2port0>;
	};
	};

	switch@1 {
	#address-cells = <1>;
	#size-cells = <0>;
	reg = <17 1>; /* MDIO address 17, switch 1 in tree */
	mii-bus = <&mii_bus1>;
	reset-gpios = <&gpio5 1 GPIO_ACTIVE_LOW>;

	switch1port0: port@0 {
	reg = <0>;
	label = "dsa";
	link = <&switch0port6>;
	};
	switch1port1: port@1 {
	reg = <1>;
	label = "dsa";
	link = <&switch2port1>;
	};
	};

	switch@2 {
	#address-cells = <1>;
	#size-cells = <0>;
	reg = <18 2>; /* MDIO address 18, switch 2 in tree */
	mii-bus = <&mii_bus1>;

	switch2port0: port@0 {
	reg = <0>;
	label = "dsa";
	link = <&switch1port1
	&switch0port6>;
	};
	};
	};