On 17/11/2023 22:18, Elliot Berman wrote: > The PSCI SYSTEM_RESET2 call allows vendor firmware to define additional > reset types which could be mapped to the reboot argument. > > Setting up reboot on Qualcomm devices can be inconsistent from chipset > to chipset. Generally, there is a PMIC register that gets written to > decide the reboot type. There is also sometimes a cookie that can be > written to indicate that the bootloader should behave differently than a > regular boot. These knobs evolve over product generations and require > more drivers. Qualcomm firmwares are beginning to expose vendor > SYSTEM_RESET2 types to simplify driver requirements from Linux. > > Add support in PSCI to statically wire reboot mode commands from > userspace to a vendor reset and cookie value using the device tree. The > DT bindings are similar to reboot mode framework except that 2 > integers are accepted (the type and cookie). Also, reboot mode framework > is intended to program, but not reboot, the host. PSCI SYSTEM_RESET2 > does both. I've not added support for reading ACPI tables since I don't > have any device which provides them + firmware that supports vendor > SYSTEM_RESET2 types. > > Previous discussions around SYSTEM_RESET2: > - https://lore.kernel.org/lkml/20230724223057.1208122-2-quic_eberman@xxxxxxxxxxx/T/ > - https://lore.kernel.org/all/4a679542-b48d-7e11-f33a-63535a5c68cb@xxxxxxxxxxx/ Please link here upstream DTS user for this. Best regards, Krzysztof
