tree c4754e75f073584577c59bc4ee56bb922cbc8ba9
parent cf8213205974c5089ebb6164ab9cff591ff7a5d0
author Bin Meng <bmeng.cn@gmail.com> 1558508986 -0700
committer Joe Hershberger <joe.hershberger@ni.com> 1559413997 -0500

dm: net: macb: Implement link speed change callback

At present the link speed change callback is a nop. According to
macb device tree bindings, an optional "tx_clk" is used to clock
the ethernet controller's TX_CLK under different link speed.

In 10/100 MII mode, transmit logic must be clocked from a free
running clock generated by the external PHY. In gigabit GMII mode,
the controller, not the external PHY, must generate the 125 MHz
transmit clock towards the PHY.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Tested-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>