Replace all license headers with the SPDX-License-Identitier headers to
follow the current recommendations.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Some devices / hubs require switching both USB-2 and USB-3 ports to
function correctly. Add ppps3_path device option to control USB-3 port
in addition to the USB-2 port.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Since Linux kernel 6.0, PPPS capable USB hubs expose a simple sysfs
attribute for power control. Allow overwriting the usb control callback
to use PPPS hub control instead.
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
