Merge branch 'mse102x-support'

Stefan Wahren says:

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add Vertexcom MSE102x support

This patch series adds support for the Vertexcom MSE102x Homeplug GreenPHY
chips [1]. They can be connected either via RGMII, RMII or SPI to a host CPU.
These patches handles only the last one, with an Ethernet over SPI protocol
driver.

The code has been tested only on Raspberry Pi boards, but should work
on other platforms.

Changes in V3:
- drop IF_PORT_HOMEPLUG again, since it's actually not used

Changes in V2:
- improve lock handling for RX & TX path
- add new patch to introduce IF_PORT_HOMEPLUG as suggested by Andrew Lunn
- address all the comments by Jakub Kicinski, Andrew Lunn, Kernel test robot

[1] - http://www.vertexcom.com/p_homeplug_plc_en.html


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Signed-off-by: David S. Miller <davem@davemloft.net>