Re: [PATCH v2 0/2] Add devicetree bindings for spi-virtio

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Oct 27, 2026 at 01:46:35PM +0100, Francesco Valla wrote:
> Hello Michael,
> 
> On Tue, Oct 27, 2026 at 06:50:51AM -0400, Michael S. Tsirkin wrote:
> > On Tue, Oct 27, 2026 at 08:26:32AM +0100, Francesco Valla wrote:
> > > When a virtio transport exposes a non-discoverable bus, the devicetree
> > > can be used to declare its child devices (if any) and/or other
> > > properties. To allow for that, the virtio framework searches for a node
> > > with a suitable compatible in virtio_device_of_init() when registering
> > > a device [1]; such compatible takes the form "virtio,deviceXX", where
> > > XX is the hexadecimal representation of the virtio device ID as defined
> > > by the virtio specification.
> > > 
> > > This patchset thus does not introduce a new functionality, but allows
> > > proper validation of nodes tied to spi-virtio devices, aligning SPI to
> > > what is already being done for e.g. I2C and GPIO virtio devices.
> > > It was sent initially as part of a different patchset [2], but since it
> > > complements a functionality that is de-facto already there and is useful
> > > beyond that specific use case it was sent separately (also following the
> > > maintainer's feedback there to separate it from remoteproc-specific
> > > changes).
> > > 
> > > This was tested both with virtio-mmio using qemu-system-aarch64 and with
> > > remoteproc-virtio with a Zephyr backend (with relevant remoteproc-virtio
> > > parts still not not upstreamed - see [2]).
> > > 
> > > I added myself as reviewer for the spi-virtio driver to be CC'd on any
> > > patch involving the new bindings.
> > > 
> > > Thank you!
> > > 
> > > Regards,
> > > Francesco
> > > 
> > > [1] https://elixir.bootlin.com/linux/v7.2.8/source/drivers/virtio/virtio.c#L488
> > > [2] https://lore.kernel.org/linux-remoteproc/20260916-remoteproc_virtio_map-v1-0-dac8c5eb4aa9@valla.it/
> > > 
> > > Signed-off-by: Francesco Valla <francesco@valla.it>
> > > ---
> > 
> > I hope this can be merged through the devicetree maintainers,
> > I have no idea.
> > MAINTAINERS changes needs an ack from existing maintainers, of
> > course.
> > 
> 
> This might prove... difficult. My e-mails to the maintainer (Haixu Cui
> @quicinc.com) continue to be bounced back by the Qualcomm postmaster
> with a RecipientNotFound error. Maybe someone from Qualcomm can give me
> a lead on how to contact them?

Indeed, so it did for me.  Oh that's no good at all.

Mark, what's your take? The maintainer is MIA but we have a volunteer
maintainer here.

As far as I'm concerned

Acked-by: Michael S. Tsirkin <mst@redhat.com>




> > > Changes in v2:
> > > - Expanded the commit message to better explain the functionality and
> > >   the chosen compatible.
> > > - Redundant pieces dropped from bindings.
> > > - Link to v1: https://patch.msgid.link/20260929-spi-virtio-bindings-v1-0-6a0eef3213b3@valla.it
> > > 
> > > To: Haixu Cui <quic_haixcui@quicinc.com>
> > > To: Francesco Valla <francesco@valla.it>
> > > To: Mark Brown <broonie@kernel.org>
> > > To: Rob Herring <robh@kernel.org>
> > > To: Krzysztof Kozlowski <krzk+dt@kernel.org>
> > > To: Conor Dooley <conor+dt@kernel.org>
> > > Cc: virtualization@lists.linux.dev
> > > Cc: linux-spi@vger.kernel.org
> > > Cc: devicetree@vger.kernel.org
> > > Cc: linux-kernel@vger.kernel.org
> > > 
> > > ---
> > > Francesco Valla (2):
> > >       dt-bindings: spi: add spi-virtio
> > >       MAINTAINERS: add Francesco as spi-virtio reviewer
> > > 
> > >  .../devicetree/bindings/spi/spi-virtio.yaml        | 46 ++++++++++++++++++++++
> > >  MAINTAINERS                                        |  2 +
> > >  2 files changed, 48 insertions(+)
> > > ---
> > > base-commit: d135ab453a7400a34930bdda1ef4bdc8acfac80e
> > > change-id: 20260927-spi-virtio-bindings-f4e350b2709a
> > > 
> > > Best regards,
> > > --  
> > > Francesco Valla <francesco@valla.it>
> > 
> 
> Regards,
> Francesco