diff options
| author | Rick Adams <rgadams@codeaurora.org> | 2010-09-28 10:21:07 -0700 |
|---|---|---|
| committer | Kyle Yan <kyan@codeaurora.org> | 2016-06-21 15:13:09 -0700 |
| commit | 44ed42824b3b3fa37be82227409f7d2f64b18c43 (patch) | |
| tree | cfd467e95ceb486d9a37a9355a25f0b12aa2d032 /Documentation | |
| parent | b60e5b41b9b9298fd8268c34a96440c770e80d16 (diff) | |
msm: falcon: put reason for boot in procfs from SMEM
During board initialization read the shared memory item
SMEM_POWER_ON_STATUS_INFO and place it in the procfs at
/proc/sys/kernel/boot_reason
The data item is an integer with a bit being set to identify the reason
the device was powered on. The values of this data item is defined in
the document Document/arm/msm/boot.txt, the following is the data in the
documentation file.
power_on_status values set by the PMIC for power on event:
----------------------------------------------------------
0x01 -- keyboard power on
0x02 -- RTC alarm
0x04 -- cable power on
0x08 -- SMPL
0x10 -- Watch Dog timeout
0x20 -- USB charger
0x40 -- Wall charger
0xFF -- error reading power_on_status value
This is cherrypicked from commit <372d39f87b0da75>
("put reason for boot in procfs") of 3.18 tree.
Change-Id: I59e665f92e6e29f7dfef4380314f676a2d92c94b
Signed-off-by: Rick Adams <rgadams@codeaurora.org>
[abhimany: fix up minor merge conflicts]
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/arm/msm/boot.txt | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/arm/msm/boot.txt b/Documentation/arm/msm/boot.txt new file mode 100644 index 000000000000..1a41cd532020 --- /dev/null +++ b/Documentation/arm/msm/boot.txt @@ -0,0 +1,23 @@ +Introduction +============= +The power management integrated circuit (PMIC) records the reason the +Application processor was powered on in Shared Memory. +The hardware and software used is the shared memory interface. This document +is not for the purpose of describing this interface, but to identify the +possible values for this data item. + +Description +=========== +Shared memory item (SMEM_POWER_ON_STATUS_INFO) is read to get access to +this data. The table below identifies the possible values stored. + +power_on_status values set by the PMIC for power on event: +---------------------------------------------------------- +0x01 -- keyboard power on +0x02 -- RTC alarm +0x04 -- cable power on +0x08 -- SMPL +0x10 -- Watch Dog timeout +0x20 -- USB charger +0x40 -- Wall charger +0xFF -- error reading power_on_status value |