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.. SPDX-License-Identifier: GPL-2.0
Kernel driver sg2042-mcu
========================
Supported chips:
* Onboard MCU for sg2042
Addresses scanned: -
Prefix: 'sg2042-mcu'
Authors:
- Inochi Amaoto <inochiama@outlook.com>
Description
-----------
This driver supprts hardware monitoring for onboard MCU with
i2c interface.
Usage Notes
-----------
This driver does not auto-detect devices. You will have to instantiate
the devices explicitly.
Please see Documentation/i2c/instantiating-devices.rst for details.
Sysfs Attributes
----------------
The following table shows the standard entries support by the driver:
================= =====================================================
Name Description
================= =====================================================
temp1_input Measured temperature of SoC
temp1_crit Critical high temperature
temp1_crit_hyst hysteresis temperature restore from Critical
temp2_input Measured temperature of the base board
================= =====================================================
The following table shows the extra entries support by the driver
(the MCU device is in i2c subsystem):
================= ======= =============================================
Name Perm Description
================= ======= =============================================
reset_count RO Reset count of the SoC
uptime RO Seconds after the MCU is powered
reset_reason RO Reset reason for the last reset
repower_policy RW Execution policy when triggering repower
================= ======= =============================================
``repower_policy``
The repower is triggered when the temperature of the SoC falls below
the hysteresis temperature after triggering a shutdown due to
reaching the critical temperature.
The valid values for this entry are "repower" and "keep". "keep" will
leave the SoC down when the triggering repower, and "repower" will
boot the SoC.
Debugfs Interfaces
------------------
If debugfs is available, this driver exposes some hardware specific
data in ``/sys/kernel/debug/sg2042-mcu/*/``.
================= ======= =============================================
Name Format Description
================= ======= =============================================
firmware_version 0x%02x firmware version of the MCU
pcb_version 0x%02x version number of the base board
board_type 0x%02x identifiers for the base board
mcu_type %d type of the MCU: 0 is STM32, 1 is GD32
================= ======= =============================================
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