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f07d03dcb1
Add the option to use the PLL connected the 16Mhz HSI oscillator. Fix the system timer pre-scaling when changing frequency: - we need to generate an update event immediately as on a 32-bit timer it might take a very long time before going an actual update event. - we need to ensure that the OS timestamp is monotonic and sensible across the frequency jump. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=chrome-os-partner:62893 TEST=manual, on STM32L4 console, do several gettime and compare against wall time, switch to 80Mhz with 'clock pll', verify again gettime against wall clock. Change-Id: Ibddbd46173b7594d16fb07e4b57660a50c636568 Reviewed-on: https://chromium-review.googlesource.com/445776 Commit-Ready: Vincent Palatin <vpalatin@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>