On Fri, Oct 6, 2017 at 7:02 PM, Sudeep Holla <sudeep.holla@xxxxxxx> wrote: > > > On 06/10/17 12:26, Jassi Brar wrote: >> On Wed, Oct 4, 2017 at 5:06 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote: >>> On Thu, Sep 28, 2017 at 3:11 PM, Sudeep Holla <sudeep.holla@xxxxxxx> wrote: >>>> This patch adds ARM MHU specific mailbox interface for SCMI. >>>> >>>> Cc: Arnd Bergmann <arnd@xxxxxxxx> >>>> Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx> >>> >>> This clearly needs an explanation why we need another driver. >>> >> Yes the patch needs explanation which is that we need a shim layer to >> map SCMI requests onto what the underlying controller expects. The >> alternative was to clone the controller driver (MHU now and others >> later when their platforms support SCMI) and pretend SCMI is the only >> client they are ever going to serve. >> > > Again that's not the point, doorbell is more common feature and that can > be supported. As SCMI expects doorbell feature in the specification, it > just need to support that class of controllers. > NO. All SCMI expects is SHMEM and a signal reaching the other end. The signal mechanism need not necessarily be "doorbell". -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
