On Wednesday 12 November 2014 19:59:38 Ashwin Chaugule wrote: > ACPI 5.0+ spec defines a generic mode of communication > between the OS and a platform such as the BMC. This medium > (PCC) is typically used by CPPC (ACPI CPU Performance management), > RAS (ACPI reliability protocol) and MPST (ACPI Memory power > states). > > This patch adds PCC support as a Mailbox Controller. As of > ACPI v5.1 there is no provision for clients to lookup mailbox > controllers in a way that Linux expects. e.g. in DT the clients > can list the mailboxes they can associate with in the DT binding > and then provide a unique index to lookup a channel within a mailbox. > Since the ACPI spec doesn't have anything similar, we introduce a > mailbox controller specific API so that when the client calls it, > we know to lookup in the context of a specific controller. This > also helps in keeping a consistent interface across DT and ACPI > for such drivers. > > This patch implements basic PCC support using the ACPI v5.1 > structures. IRQ mode support will be provided as follow up patches. > > Reviewed-by: Mark Brown <broonie@xxxxxxxxxx> > Signed-off-by: Ashwin Chaugule <ashwin.chaugule@xxxxxxxxxx> > Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
