board: amlogic: vim3: add support for dynamic PCIe enable
The VIM3 on-board MCU can mux the PCIe/USB3.0 shared differential lines using a FUSB340TMX USB 3.1 SuperSpeed Data Switch between an USB3.0 Type A connector and a M.2 Key M slot. The PHY driving these differential lines is shared between the USB3.0 controller and the PCIe Controller, thus only a single controller can use it. This adds this dynamic switching right before booting Linux and the configuration steps in the boards documentation. Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com> Reviewed-by: NKevin Hilman <khilman@baylibre.com> Tested-by: NKevin Hilman <khilman@baylibre.com> [narmstrong: fixed warning by replacing min() by min_t()]
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board/amlogic/vim3/khadas-mcu.h
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