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Most MSM8916 devices shipped without PSCI support. The history is quite nuanced (a good overview can be found in [1]), but the end result is that the upstream DTs for this SoC pretend that PSCI exists, and it's expected that the bootloader handles the case where it doesn't. This is codified by the de-facto bootloader for MSM8916 devices, lk2nd [2]. So we handle it here by deleting the /psci node if we detect the absence of PSCI. We need to do this early to ensure sysreset works correctly, since the PSCI firmware driver is PRE_RELOC and binds the PSCI sysreset driver. Additionally, show_psci_version is updated to check that PSCI exists. Currently this banner outputs "PSCI: 65535.65535" on devices without PSCI support, which isn't very useful :) [1]: https://github.com/msm8916-mainline/linux/issues/388 [2]: https://github.com/msm8916-mainline/lk2nd/blob/8183ea2/lk2nd/smp/spin-table/spin-table.c#L237 Signed-off-by: Sam Day <me@samcday.com> Link: https://lore.kernel.org/r/20250127-qcom-handle-absent-psci-v1-1-e762f2db938c@samcday.com Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>