From db40c1aa1c100d8a9e33206575efd8b3678f31db Mon Sep 17 00:00:00 2001 From: Hannes Schmelzer Date: Thu, 23 Mar 2017 15:11:43 +0100 Subject: drivers/net/phy: add fixed-phy / fixed-link support This patch adds support for having a "fixed-link" to some other MAC (like some embedded switch-device). For this purpose we introduce a new phy-driver, called "Fixed PHY". Fixed PHY works only with CONFIG_DM_ETH enabled, since the fixed-link is described with a subnode below ethernet interface. Most ethernet drivers (unfortunately not all are following same scheme for searching/attaching phys) are calling "phy_connect(...)" for getting a phy-device. At this point we link in, we search here for a subnode called "fixed- link", once found we start phy_device_create(...) with the special phy- id PHY_FIXED_ID (0xa5a55a5a). During init the "Fixed PHY" driver has registered with this id and now gets probed, during probe we get all the details about fixed-link out of dts, later on the phy reports this values. Signed-off-by: Hannes Schmelzer Signed-off-by: Hannes Schmelzer Acked-by: Joe Hershberger Reviewed-by: Christian Gmeiner --- doc/device-tree-bindings/net/fixed-link.txt | 30 +++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 doc/device-tree-bindings/net/fixed-link.txt (limited to 'doc') diff --git a/doc/device-tree-bindings/net/fixed-link.txt b/doc/device-tree-bindings/net/fixed-link.txt new file mode 100644 index 00000000000..5829bd81a22 --- /dev/null +++ b/doc/device-tree-bindings/net/fixed-link.txt @@ -0,0 +1,30 @@ +Fixed link Device Tree binding +------------------------------ + +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. + +Examples: + +ethernet@0 { + ... + fixed-link { + speed = <1000>; + full-duplex; + }; + ... +}; -- cgit v1.3.1