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

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

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.

> 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>