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Implement VBUS session handling for FOTG210. This is mainly used by the UDC driver which needs to call down to the FOTG210 core and enable/disable VBUS, as this needs to be handled outside of the HCD and UDC drivers, by platform specific glue code. The Gemini has a special bit in a system register to turn VBUS on and off so we implement this in the FOTG210 core. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20230103-gemini-fotg210-usb-v2-7-100388af9810@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>