Re: [PATCH v4 2/9] bus: mhi: Move sahara protocol driver under drivers/bus/mhi

[Kishore Batta]

On 4/13/2026 4:34 PM, Manivannan Sadhasivam wrote:
> On Thu, Apr 09, 2026 at 02:20:02PM -0600, Jeff Hugo wrote:
> > On 3/19/2026 12:31 AM, Kishore Batta wrote:
> > > The Sahara protocol driver is currently located under the QAIC
> > > accelerator subsystem even though protocol itself is transported over the
> > > MHI bus and is used by multiple Qualcomm flashless devices.
> > >
> > > Relocate the Sahara protocol driver to drivers/bus/mhi and register it as
> > > an independent MHI protocol driver. This avoids treating Sahara as QAIC
> > > specific and makes it available for reuse by other MHI based devices.
> > >
> > > As part of this move, introduce a dedicated Kconfig and Makefile under the
> > > MHI subsystem and expose the sahara interface via a common header.
> > I don't think this belongs under MHI. Mani needs to confirm that he agrees
> > with the concept of moving this there.
> >
> > The Sahara protocol as defined by the spec does not require MHI. We know
> > that there are Sahara implementations over USB. I don't see a dependency or
> > relationship to MHI other than the current in-kernel implementation uses
> > MHI, but there are plenty of things that use MHI (qaic, mhi-net, ath12k,
> > etc) which are not a part of the MHI bus.
> Since Sahara is a MHI client driver, it is OK with me to place it under
> drivers/bus/mhi/host/. We do tend to host the client/controller drivers if they
> also bind to separate top level subsystems like Net, WWAN... but for the pure
> protocol drivers like Sahara, MHI can provide asylum.
>
> - Mani
Thanks for the confirmation Mani. I will keep the Sahara driver under 
driver/bus/mhi/host/ and also move the Sahara documentation under 
Documentation/mhi/ directory.