On 20/11/2023 17:03, Elliot Berman wrote: > > > 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. It's enough if you link to lore or any other upstream-oriented tree with that user. Does not have to be merged. Best regards, Krzysztof
