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android/Documentation/ABI/testing/sysfs-platform-chipidea-usb-otg
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threeeye bc1d038eac REVVL 6 Pro kernel bring-up: full working tree snapshot (2026-09-12)
Squashed backup commit (no shallow-clone history issues) of
xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream
commit 9eece662e) plus all fixes applied to get everpal_defconfig building
clean against a modern (GCC 15.2.0) toolchain -- see the previous commit
message on the lineage-23.2 branch (also in this repo history is not
available here since this is a squashed snapshot; full incremental history
lives in the local DL380 checkout and the upstream GitHub remote).

Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
2026-09-12 13:36:46 +00:00

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What: /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req
Date: Feb 2014
Contact: Li Jun <b47624@freescale.com>
Description:
Can be set and read.
Set a_bus_req(A-device bus request) input to be 1 if
the application running on the A-device wants to use the bus,
and to be 0 when the application no longer wants to use
the bus(or wants to work as peripheral). a_bus_req can also
be set to 1 by kernel in response to remote wakeup signaling
from the B-device, the A-device should decide to resume the bus.
Valid values are "1" and "0".
Reading: returns 1 if the application running on the A-device
is using the bus as host role, otherwise 0.
What: /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop
Date: Feb 2014
Contact: Li Jun <b47624@freescale.com>
Description:
Can be set and read
The a_bus_drop(A-device bus drop) input is 1 when the
application running on the A-device wants to power down
the bus, and is 0 otherwise, When a_bus_drop is 1, then
the a_bus_req shall be 0.
Valid values are "1" and "0".
Reading: returns 1 if the bus is off(vbus is turned off) by
A-device, otherwise 0.
What: /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req
Date: Feb 2014
Contact: Li Jun <b47624@freescale.com>
Description:
Can be set and read.
The b_bus_req(B-device bus request) input is 1 during the time
that the application running on the B-device wants to use the
bus as host, and is 0 when the application no longer wants to
work as host and decides to switch back to be peripheral.
Valid values are "1" and "0".
Reading: returns if the application running on the B device
is using the bus as host role, otherwise 0.
What: /sys/bus/platform/devices/ci_hdrc.0/inputs/a_clr_err
Date: Feb 2014
Contact: Li Jun <b47624@freescale.com>
Description:
Only can be set.
The a_clr_err(A-device Vbus error clear) input is used to clear
vbus error, then A-device will power down the bus.
Valid value is "1"