Re: [Xen-devel] [PATCH RFC] xen/arm : emulation of arm's psci v0.2 standard

[Christoffer Dall <christoffer.dall@xxxxxxxxxx>]

On 23 June 2014 07:28, Parth Dixit <parth.dixit@xxxxxxxxxx> wrote:
> Next version of my patch is ready except for following things on which i
> need your suggestion
>
> 1. Exposing PSCI v0.2 functions in device tree - This was not done because
> it gives the impression that you can modify the function id's and kernel
> will call the function id's based on function id's exposed in device tree
> whereas kernel ignores it for PSCI v0.2 while it follows it for PSCI v0.1
> which can be confusing. Either way is fine with me.

I don't see why this has become such a large issue of debate; the
device tree is a stable ABI, we have agreed on the bindings for PSCI
v0.2:
https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/arm/psci.txt

Just provide the IDs that apply for PSCI v0.1 so older kernels will
still work with Xen - newer versions of Linux will ignore the function
IDs and use the ones defined in the spec.

-Christoffer

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