drivers/net/phy: add fixed-phy / fixed-link support
authorHannes Schmelzer <hannes.schmelzer@br-automation.com>
Thu, 23 Mar 2017 14:11:43 +0000 (15:11 +0100)
committerJoe Hershberger <joe.hershberger@ni.com>
Sun, 26 Mar 2017 14:58:26 +0000 (09:58 -0500)
commitdb40c1aa1c100d8a9e33206575efd8b3678f31db
tree1a83d22ec2356367ee6c5b6ab5227e0a3b656bbe
parentf8e57c650d691e3617c49a16ec7a4dcab436100e
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 <hannes.schmelzer@br-automation.com>
Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
doc/device-tree-bindings/net/fixed-link.txt [new file with mode: 0644]
drivers/net/phy/Kconfig
drivers/net/phy/Makefile
drivers/net/phy/fixed.c [new file with mode: 0644]
drivers/net/phy/phy.c
include/phy.h