[U-Boot] ARM: PSCI 0.1 vs 0.2

[Marc Zyngier]

On 10/11/14 12:51, Jan Kiszka wrote:
> Hi Marc,
> 
> what is the motivation to expose a PSCI 0.1 interface in U-boot, instead
> of 0.2? Support for preexisting users of 0.1? The kernel seems to be
> happy with both, and I'm now wondering if we should actually add the
> legacy version to Jailhouse as well (I hope we can avoid this).

The initial rational was simple: at the time this code was written, the
0.2 spec still in review, and nobody was implementing it. Supporting 0.1
was the only viable use-case.

> Still studying the logic: Is it possible to provide both interfaces, and
> would it make sense?

Supporting both is very easy. Just output the 0.2 function numbers that
actually make sense for 0.1 and have both compatible strings.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...