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SubjectRe: [RFC PATCH 5/5] arm64: qcom: add cpu operations
On Tue, Apr 14, 2015 at 11:52:39PM +0100, Al Stone wrote:
> On 04/14/2015 10:29 AM, Mark Rutland wrote:
> >> diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
> >> index 8b9e0a9..35cabe5 100644
> >> --- a/Documentation/devicetree/bindings/arm/cpus.txt
> >> +++ b/Documentation/devicetree/bindings/arm/cpus.txt
> >> @@ -185,6 +185,8 @@ nodes to be present and contain the properties described below.
> >> be one of:
> >> "psci"
> >> "spin-table"
> >
> > In the case of these two, there's documentation on what the OS, FW, and
> > HW are expected to do. There's a PSCI spec, and spin-table is documented
> > in booting.txt (which is admittedly not fantastic).
> > [snip...]
>
> Perhaps a side topic, but I thought spin-table was being actively discouraged
> for arm64. Forgive me if I missed the memo, but is that not correct?

We prefer that people implement PSCI, and if they must use spin-table,
each CPU has its own release address.

However, we don't want implementation-specific mechanisms, and
spin-table is preferable to these.

Mark.


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