Re: [Linaro-acpi] [PATCH v3 1/3] Mailbox: Add support for PCC mailbox and channels

[Mark Brown <broonie@kernel.org>]

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On Wed, Sep 03, 2014 at 01:23:21PM +0200, Arnd Bergmann wrote:
> On Tuesday 02 September 2014 16:15:05 Ashwin Chaugule wrote:

> > Right. At least not in a way DT does. PCC clients know if something
> > needs to be written/read via PCC mailbox and can identify a PCC
> > subspace. (i.e. Mailbox channel). The PCC mailbox is uniquely
> > identified/defined in the spec.

> > #define ACPI_ADR_SPACE_PLATFORM_COMM    (acpi_adr_space_type) 10

> > So we could use this ID instead of a string and use that to look up
> > the PCC controller for a PCC client.

> I didn't realize this was the case. Does that mean we can treat
> pcc as a linearly accessible address space the way we do for
> system memory, pci-config etc?

> If that works, we should probably just have a regmap for it rather
> than expose the mailbox API to client drivers.

A regmap doesn't seem to map very well here - as far as I can tell the
addresses referred to are mailboxes rather than registers or memory
addresses.  I could be misunderstanding though.

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