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

On Mon, 23 Jun 2014, Christoffer Dall wrote:
> 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.


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