On Wed, Oct 4, 2017 at 5:06 PM, Arnd Bergmann <[email protected]> wrote: > On Thu, Sep 28, 2017 at 3:11 PM, Sudeep Holla <[email protected]> wrote: >> This patch adds ARM MHU specific mailbox interface for SCMI. >> >> Cc: Arnd Bergmann <[email protected]> >> Signed-off-by: Sudeep Holla <[email protected]> > > 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.
BTW, I haven't reviewed this patchset yet so I am not sure about this code but I do believe we need a transport layer (this shim driver) between generic SCMI implementation and each controller driver.
