Randall Spangler b0c8ce6948 pit: Support changing EC clock frequency ...

Modules which care about system clock frequency now hook HOOK_FREQ_CHANGE.
  - hwtimer
  - i2c
  - uart (which is now also smart enough to use x8 oversampling instead of
          x16 when the system clock is too slow to support x16)

Added 'clock' debug command to set system clock frequency.

STM32F platforms don't change clock frequency; on those platforms,
clock_get_freq() simply returns CPU_CLOCK, so behavior of those
platforms is unchanged.

BUG=chrome-os-partner:20414
BRANCH=none
TEST=from EC console:
   - reboot ap-off -> to make sure AP is off during testing
   - clock msi2 -> reports 2MHz clock
   - battery -> reports battery info
   - clock msi1 -> reports 1MHz clock
   - battery -> reports battery info
   - clock hsi -> reports 16MHz clock
   - battery -> reports battery info
   - power on -> AP powers on and host commands succeed

Change-Id: Ib8276bf124727e4fb502297ca8b3d6d4b6170241
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/59645

2013-06-25 23:24:23 -07:00

..

host

Console input support for emulator

2013-06-10 20:21:37 -07:00

lm4

Refactor host command interface to support version 3 packets

2013-06-20 13:55:11 -07:00

stm32

pit: Support changing EC clock frequency

2013-06-25 23:24:23 -07:00