Re: [PATCH 1/5] dt-bindings: virtio: mmio: Add support for device subnode
From: Viresh Kumar <viresh.kumar@linaro.org>
Date: 2021-07-19 10:33:44
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On 14-07-21, 23:07, Arnd Bergmann wrote:
On Wed, Jul 14, 2021 at 5:43 PM Rob Herring [off-list ref] wrote:quoted
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 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization