Re: [PATCH 1/5] dt-bindings: virtio: mmio: Add support for device subnode

[Viresh Kumar]

On 14-07-21, 23:07, Arnd Bergmann wrote:
> On Wed, Jul 14, 2021 at 5:43 PM Rob Herring <robh+dt@xxxxxxxxxx> wrote:
> > I guess it comes down to is 'virtio,mmio' providing a bus or is it
> > just a device? I guess a bus (so 2 nodes) does make sense here.
> > 'virtio,mmio' defines how you access/discover the virtio queues (the
> > bus) and the functional device (i2c, gpio, iommu, etc.) is accessed
> > via the virtio queues.
> 
> It's not really a bus since there is only ever one device behind it.
> A better analogy would be your 'serdev' framework: You could
> have a 8250 or a pl011 uart, and behind that have a mouse, GPS
> receiver or bluetooth dongle.
> 
> In Documentation/devicetree/bindings/serial/serial.yaml, you also
> have two nodes for a single device, so we could follow that
> example.

So two device nodes is final then ? Pretty much like how this patchset did it
already ? I need to get rid of reg thing and use "virtio,DID" though.

-- 
viresh