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doc: bindings: add bindings document for PHY nodes

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It defines that PHY nodes must be children on MDIO bus nodes and defines
the only required property in U-Boot, reg.  This property along with the
example provided are copied over from Linux.

Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Alex Marginean 2019-11-14 18:28:36 +02:00 committed by Joe Hershberger
parent 6d9bc2043a
commit e81031c2b8
1 changed files with 24 additions and 0 deletions
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doc/device-tree-bindings/net/phy.txt Normal file
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PHY nodes
If the device tree is used to describe networking interfaces, U-Boot expects a
node for each PHY. Parent node for such a PHY node is expected to correspond to
a MDIO bus and the bus is used to access the PHY.
Required properties:
- reg : The ID number for the phy, usually a small integer
Example:
ethernet-phy@0 {
compatible = "ethernet-phy-id0141.0e90", "ethernet-phy-ieee802.3-c22";
interrupt-parent = <&PIC>;
interrupts = <35 IRQ_TYPE_EDGE_RISING>;
reg = <0>;
resets = <&rst 8>;
reset-names = "phy";
reset-gpios = <&gpio1 4 GPIO_ACTIVE_LOW>;
reset-assert-us = <1000>;
reset-deassert-us = <2000>;
};