1 What: /sys/bus/mhi/devices/.../seria 1 What: /sys/bus/mhi/devices/.../serialnumber
2 Date: Sept 2020 2 Date: Sept 2020
3 KernelVersion: 5.10 3 KernelVersion: 5.10
4 Contact: mhi@lists.linux.dev 4 Contact: mhi@lists.linux.dev
5 Description: The file holds the serial numb 5 Description: The file holds the serial number of the client device obtained
6 using a BHI (Boot Host Interfa 6 using a BHI (Boot Host Interface) register read after at least
7 one attempt to power up the de 7 one attempt to power up the device has been done. If read
8 without having the device powe 8 without having the device power on at least once, the file will
9 read all 0's. 9 read all 0's.
10 Users: Any userspace application or c 10 Users: Any userspace application or clients interested in device info.
11 11
12 What: /sys/bus/mhi/devices/.../oem_p 12 What: /sys/bus/mhi/devices/.../oem_pk_hash
13 Date: Sept 2020 13 Date: Sept 2020
14 KernelVersion: 5.10 14 KernelVersion: 5.10
15 Contact: mhi@lists.linux.dev 15 Contact: mhi@lists.linux.dev
16 Description: The file holds the OEM PK Hash 16 Description: The file holds the OEM PK Hash value of the endpoint device
17 obtained using a BHI (Boot Hos 17 obtained using a BHI (Boot Host Interface) register read after
18 at least one attempt to power 18 at least one attempt to power up the device has been done. If
19 read without having the device 19 read without having the device power on at least once, the file
20 will read all 0's. 20 will read all 0's.
21 Users: Any userspace application or c 21 Users: Any userspace application or clients interested in device info.
22 22
23 What: /sys/bus/mhi/devices/.../soc_r 23 What: /sys/bus/mhi/devices/.../soc_reset
24 Date: April 2022 24 Date: April 2022
25 KernelVersion: 5.19 25 KernelVersion: 5.19
26 Contact: mhi@lists.linux.dev 26 Contact: mhi@lists.linux.dev
27 Description: Initiates a SoC reset on the M 27 Description: Initiates a SoC reset on the MHI controller. A SoC reset is
28 a reset of last resort, and wi 28 a reset of last resort, and will require a complete re-init.
29 This can be useful as a method 29 This can be useful as a method of recovery if the device is
30 non-responsive, or as a means 30 non-responsive, or as a means of loading new firmware as a
31 system administration task. 31 system administration task.
32 32
33 What: /sys/bus/mhi/devices/.../trigg 33 What: /sys/bus/mhi/devices/.../trigger_edl
34 Date: April 2024 34 Date: April 2024
35 KernelVersion: 6.10 35 KernelVersion: 6.10
36 Contact: mhi@lists.linux.dev 36 Contact: mhi@lists.linux.dev
37 Description: Writing a non-zero value to th 37 Description: Writing a non-zero value to this file will force devices to
38 enter EDL (Emergency Download) 38 enter EDL (Emergency Download) mode. This entry only exists for
39 devices capable of entering th 39 devices capable of entering the EDL mode using the standard EDL
40 triggering mechanism defined i 40 triggering mechanism defined in the MHI spec v1.2. Once in EDL
41 mode, the flash programmer ima 41 mode, the flash programmer image can be downloaded to the
42 device to enter the flash prog 42 device to enter the flash programmer execution environment.
43 This can be useful if user wan 43 This can be useful if user wants to use QDL (Qualcomm Download,
44 which is used to download firm 44 which is used to download firmware over EDL) to update firmware.
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