1 .. SPDX-License-Identifier: GPL-2.0 2 3 Kernel driver sg2042-mcu 4 ======================== 5 6 Supported chips: 7 8 * Onboard MCU for sg2042 9 10 Addresses scanned: - 11 12 Prefix: 'sg2042-mcu' 13 14 Authors: 15 16 - Inochi Amaoto <inochiama@outlook.com> 17 18 Description 19 ----------- 20 21 This driver supprts hardware monitoring for onboard MCU with 22 i2c interface. 23 24 Usage Notes 25 ----------- 26 27 This driver does not auto-detect devices. You will have to instantiate 28 the devices explicitly. 29 Please see Documentation/i2c/instantiating-devices.rst for details. 30 31 Sysfs Attributes 32 ---------------- 33 34 The following table shows the standard entries support by the driver: 35 36 ================= ===================================================== 37 Name Description 38 ================= ===================================================== 39 temp1_input Measured temperature of SoC 40 temp1_crit Critical high temperature 41 temp1_crit_hyst hysteresis temperature restore from Critical 42 temp2_input Measured temperature of the base board 43 ================= ===================================================== 44 45 The following table shows the extra entries support by the driver 46 (the MCU device is in i2c subsystem): 47 48 ================= ======= ============================================= 49 Name Perm Description 50 ================= ======= ============================================= 51 reset_count RO Reset count of the SoC 52 uptime RO Seconds after the MCU is powered 53 reset_reason RO Reset reason for the last reset 54 repower_policy RW Execution policy when triggering repower 55 ================= ======= ============================================= 56 57 ``repower_policy`` 58 The repower is triggered when the temperature of the SoC falls below 59 the hysteresis temperature after triggering a shutdown due to 60 reaching the critical temperature. 61 The valid values for this entry are "repower" and "keep". "keep" will 62 leave the SoC down when the triggering repower, and "repower" will 63 boot the SoC. 64 65 Debugfs Interfaces 66 ------------------ 67 68 If debugfs is available, this driver exposes some hardware specific 69 data in ``/sys/kernel/debug/sg2042-mcu/*/``. 70 71 ================= ======= ============================================= 72 Name Format Description 73 ================= ======= ============================================= 74 firmware_version 0x%02x firmware version of the MCU 75 pcb_version 0x%02x version number of the base board 76 board_type 0x%02x identifiers for the base board 77 mcu_type %d type of the MCU: 0 is STM32, 1 is GD32 78 ================= ======= =============================================
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