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SG2042 use an external MCU to provide basic hardware information and thermal sensors. Add driver support for the onboard MCU of SG2042. Signed-off-by: Inochi Amaoto <inochiama@outlook.com> Message-ID: <IA1PR20MB49536C786048D1E676BB9C20BB822@IA1PR20MB4953.namprd20.prod.outlook.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
79 lines
2.6 KiB
ReStructuredText
79 lines
2.6 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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Kernel driver sg2042-mcu
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========================
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Supported chips:
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* Onboard MCU for sg2042
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Addresses scanned: -
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Prefix: 'sg2042-mcu'
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Authors:
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- Inochi Amaoto <inochiama@outlook.com>
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Description
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-----------
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This driver supprts hardware monitoring for onboard MCU with
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i2c interface.
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Usage Notes
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-----------
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This driver does not auto-detect devices. You will have to instantiate
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the devices explicitly.
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Please see Documentation/i2c/instantiating-devices.rst for details.
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Sysfs Attributes
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----------------
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The following table shows the standard entries support by the driver:
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================= =====================================================
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Name Description
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================= =====================================================
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temp1_input Measured temperature of SoC
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temp1_crit Critical high temperature
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temp1_crit_hyst hysteresis temperature restore from Critical
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temp2_input Measured temperature of the base board
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================= =====================================================
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The following table shows the extra entries support by the driver
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(the MCU device is in i2c subsystem):
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================= ======= =============================================
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Name Perm Description
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================= ======= =============================================
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reset_count RO Reset count of the SoC
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uptime RO Seconds after the MCU is powered
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reset_reason RO Reset reason for the last reset
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repower_policy RW Execution policy when triggering repower
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================= ======= =============================================
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``repower_policy``
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The repower is triggered when the temperature of the SoC falls below
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the hysteresis temperature after triggering a shutdown due to
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reaching the critical temperature.
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The valid values for this entry are "repower" and "keep". "keep" will
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leave the SoC down when the triggering repower, and "repower" will
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boot the SoC.
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Debugfs Interfaces
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------------------
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If debugfs is available, this driver exposes some hardware specific
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data in ``/sys/kernel/debug/sg2042-mcu/*/``.
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================= ======= =============================================
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Name Format Description
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================= ======= =============================================
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firmware_version 0x%02x firmware version of the MCU
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pcb_version 0x%02x version number of the base board
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board_type 0x%02x identifiers for the base board
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mcu_type %d type of the MCU: 0 is STM32, 1 is GD32
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================= ======= =============================================
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