[Skiboot] [PATCH v3 0/6] Enable basic VAS support

Oliver O'Halloran oohall at gmail.com
Thu Dec 1 10:47:01 AEDT 2016

On Thu, Dec 1, 2016 at 6:06 AM, Sukadev Bhattiprolu
<sukadev at linux.vnet.ibm.com> wrote:
> Balbir Singh [bsingharora at gmail.com] wrote:
>> On 30/11/16 16:36, Sukadev Bhattiprolu wrote:
>> > This OPAL patch set initializes the VAS registers and makes the VAS
>> > hardware available to the NX-842 driver in the kernel. It also provides
>> > some interfaces that the NX-842 subsystem in OPAL needs to initialize
>> > the NX hardware in Power9.
>> Hi, Suka
>> Is there a device-tree interface for discovery of these devices? It would
>> be good to call it out here and document the discovery process for the
>> hypervisor kernel and beyond
> Well, NX already has some device tree nodes that Haren's patches will update
> for VAS. But as of now, don't see a need for VAS-specific device tree nodes.
> Kernel can/will attempt to initialize VAS based on the processor version (P9)
> for now. If a device tree node becomes necessary, we can maybe add later?

Half the reason we have the DT is to avoid having to guess about what
hardware is present based on things like the processor version. Is
there a compelling reason not to create a DT node?

> Thanks,
> Suka
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