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platform/chrome: cros_ec_debugfs: Add debugfs entry to retrieve EC uptime

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The new debugfs entry 'uptime' is being made available to userspace so that
a userspace daemon can synchronize EC logs with host time.

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
[rework based on Tim's first approach]
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Tested-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
This commit is contained in:
Tim Wawrzynczak
2019-06-13 11:57:36 -06:00
committed by Enric Balletbo i Serra
parent 74e80d81cc
commit e90716a661
2 changed files with 46 additions and 0 deletions
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Documentation/ABI/testing/debugfs-cros-ec Normal file
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What: /sys/kernel/debug/<cros-ec-device>/uptime
Date: June 2019
KernelVersion: 5.3
Description:
A u32 providing the time since EC booted in ms. This is
is used for synchronizing the AP host time with the EC
log. An error is returned if the command is not supported
by the EC or there is a communication problem.