[PATCH 0/3] Stop managing the SP clock
From: Lubomir Rintel
Date: Mon Jan 21 2019 - 02:38:40 EST
Per discussion in  it seems that the kernel has no business managing
this clock: once the SP clock is disabled, it's not sufficient to just
enable it in order to bring the SP core back up.
Just let the firmware keep it enabled and don't expose it to drivers.
The "secure processor" (SP) core runs the keyboard firmware on the
OLPC XO 1.75 laptop.