diff options
| -rw-r--r-- | doc/device-tree-bindings/net/fixed-link.txt | 48 |
1 files changed, 36 insertions, 12 deletions
diff --git a/doc/device-tree-bindings/net/fixed-link.txt b/doc/device-tree-bindings/net/fixed-link.txt index 5829bd81a2..5efeeb6fc5 100644 --- a/doc/device-tree-bindings/net/fixed-link.txt +++ b/doc/device-tree-bindings/net/fixed-link.txt @@ -5,21 +5,37 @@ Some Ethernet MACs have a "fixed link", and are not connected to a normal MDIO-managed PHY device. For those situations, a Device Tree binding allows to describe a "fixed link". -Such a fixed link situation is described by creating a 'fixed-link' -sub-node of the Ethernet MAC device node, with the following -properties: - -* 'speed' (integer, mandatory), to indicate the link speed. Accepted - values are 10, 100 and 1000 -* 'full-duplex' (boolean, optional), to indicate that full duplex is - used. When absent, half duplex is assumed. -* 'pause' (boolean, optional), to indicate that pause should be - enabled. -* 'asym-pause' (boolean, optional), to indicate that asym_pause should - be enabled. +Note there are two ways to describe a fixed PHY attached to an +Ethernet device: + +- The new DT binding, where 'fixed-link' is a sub-node of the Ethernet + MAC device node, with the following properties: + + * 'speed' (integer, mandatory), to indicate the link speed. Accepted + values are 10, 100 and 1000 + * 'full-duplex' (boolean, optional), to indicate that full duplex is + used. When absent, half duplex is assumed. + * 'pause' (boolean, optional), to indicate that pause should be + enabled. + * 'asym-pause' (boolean, optional), to indicate that asym_pause should + be enabled. + +- The old DT binding, where 'fixed-link' is a property with 5 cells + encoding various information about the fixed PHY, in the form of + <phy_id, full-duplex, speed, pause, asym-pause>. + + * 'phy_id', emulated PHY ID, choose any but unique to the all specified + fixed-links. Note U-Boot deliberately ignores the 'phy_id' and + unconditionally uses PHY_FIXED_ID. + * 'full-duplex', 0 for half duplex or 1 for full duplex + * 'speed', link speed in Mbits/sec, accepts only 10, 100 and 1000 + * 'pause', 0 for no pause, 1 for pause + * 'asym-pause', 0 for no asymmetric pause, 1 for asymmetric pause Examples: +The new binding: + ethernet@0 { ... fixed-link { @@ -28,3 +44,11 @@ ethernet@0 { }; ... }; + +The old binding: + +ethernet@0 { + ... + fixed-link = <0 1 1000 0 0>; + ... +}; |