On 6/18/20 5:54 AM, Jon Hunter wrote:
The PSCI nodes are currently not populated for the Tegra210 and Tegra186 devices. This prevents the PSCI driver from being able to identify the PSCI method used by these devices and causes the probe of the PSCI driver to fail.
Since commit 81ea00838c68 ("efi_loader: PSCI reset and shutdown") was added, which moves the PSCI EFI system reset handler into the PSCI driver, this has prevented the EFI system reset from working for Tegra210 and Tegra186. Therefore, populating these nodes is necessary to fix the EFI system reset for Tegra210 and Tegra186.
I'm not sure that these platforms have *always* had a PSCI implementation, so this is a slight assumption. Ideally, the FW should add this to the DT and pass it to U-Boot... However, since all recentish FW builds do implement PSCI, and the DT is hard-coded into U-Boot rather than provided by the earlier FW, this change is probably just fine.