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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