On 11/20/2023 2:55 AM, Krzysztof Kozlowski wrote: > 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. The changes are applicable for SM8650, but hasn't yet landed in arm64/for-next/core. I'll include it in the v2 with note.
