On Thu, Jun 30, 2016 at 05:01:19PM +0900, Alexandre Courbot wrote: > Enable PSCI firmware and all 4 cores of T210 on Jetson TX1. > > Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx> > --- > Not sure why this was not done - in any case this seems to work fine > and performance is obviously improved (especially boot time). > > arch/arm64/boot/dts/nvidia/tegra210-p2371-2180.dts | 23 ++++++++++++++++++++++ > 1 file changed, 23 insertions(+) The reason why this wasn't done initially is because the firmware was supposed to copy this data into the device tree before passing it to the kernel. The rationale for this decision was that we can't make any assumptions about the firmware and any potential PSCI implementation. I suppose the firmware interface could be argued to be part of the hardware and therefore having it statically in DT would be okay. The one remaining issue is that it is possible to boot a Tegra X1 without any secure firmware that might provide PSCI, in which case the DT would now be lying. Thierry
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