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From: Arnd Bergmann <arnd@kernel.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: "Rob Herring" <robh+dt@kernel.org>,
	"Jason Wang" <jasowang@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	"Jean-Philippe Brucker" <jean-philippe@linaro.org>,
	"Vincent Guittot" <vincent.guittot@linaro.org>,
	"Bill Mills" <bill.mills@linaro.org>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"Enrico Weigelt, metux IT consult" <info@metux.net>,
	"Jie Deng" <jie.deng@intel.com>,
	DTML <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE"
	<virtualization@lists.linux-foundation.org>
Subject: Re: [PATCH 1/5] dt-bindings: virtio: mmio: Add support for device subnode
Date: Mon, 19 Jul 2021 14:04:08 +0200	[thread overview]
Message-ID: <CAK8P3a0udKQk_LLxUD0k2pWk=WSt=9AcaHsCEboYJX=Xj-7mwQ@mail.gmail.com> (raw)
In-Reply-To: <20210719103336.oyz6dppd5jf65w4m@vireshk-i7>

On Mon, Jul 19, 2021 at 12:34 PM Viresh Kumar <viresh.kumar@linaro.org> wrote:
> On 14-07-21, 23:07, Arnd Bergmann wrote:
> > On Wed, Jul 14, 2021 at 5:43 PM Rob Herring <robh+dt@kernel.org> 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.

Let's give Rob another day to reply here. I think two nodes is easier
to get working than one node, even when we continue supporting the
current iommu binding that relies on a single node, but we could make
it work either way if necessary.

       Arnd

  reply	other threads:[~2021-07-19 12:04 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-13 10:50 [PATCH 0/5] virtio: Parse virtio-device nodes from DT Viresh Kumar
2021-07-13 10:50 ` Viresh Kumar
2021-07-13 10:50 ` [PATCH 1/5] dt-bindings: virtio: mmio: Add support for device subnode Viresh Kumar
2021-07-13 10:50   ` Viresh Kumar
2021-07-13 12:32   ` Arnd Bergmann
2021-07-14  2:28     ` Viresh Kumar
2021-07-14  2:28       ` Viresh Kumar
2021-07-13 14:43   ` Rob Herring
2021-07-13 15:19     ` Viresh Kumar
2021-07-13 15:19       ` Viresh Kumar
2021-07-13 19:34       ` Rob Herring
2021-07-13 20:34         ` Arnd Bergmann
2021-07-14  2:26           ` Viresh Kumar
2021-07-14  2:26             ` Viresh Kumar
2021-07-14 11:40             ` Viresh Kumar
2021-07-14 11:40               ` Viresh Kumar
2021-07-14  8:20           ` Jean-Philippe Brucker
2021-07-14  8:20             ` Jean-Philippe Brucker
2021-07-14 15:43           ` Rob Herring
2021-07-14 21:07             ` Arnd Bergmann
2021-07-19 10:33               ` Viresh Kumar
2021-07-19 10:33                 ` Viresh Kumar
2021-07-19 12:04                 ` Arnd Bergmann [this message]
2021-07-14  2:19         ` Viresh Kumar
2021-07-14  2:19           ` Viresh Kumar
2021-07-13 10:50 ` [PATCH 2/5] virtio_mmio: Bind virtio device to device-tree node Viresh Kumar
2021-07-13 10:50   ` Viresh Kumar
2021-07-13 12:26   ` Arnd Bergmann
2021-07-14  3:11     ` Viresh Kumar
2021-07-14  3:11       ` Viresh Kumar
2021-07-13 10:50 ` [PATCH 3/5] dt-bindings: i2c: Add bindings for i2c-virtio Viresh Kumar
2021-07-13 10:50   ` Viresh Kumar
2021-07-13 14:03   ` Rob Herring
2021-07-13 14:03     ` Rob Herring
2021-07-13 10:50 ` [PATCH 4/5] i2c: virtio: Update i2c-adapter's of_node Viresh Kumar
2021-07-13 10:50   ` Viresh Kumar
2021-07-13 10:50 ` [PATCH 5/5] dt-bindings: gpio: Add bindings for gpio-virtio Viresh Kumar
2021-07-13 10:50   ` Viresh Kumar
2021-07-13 14:03   ` Rob Herring
2021-07-13 14:03     ` Rob Herring
2021-07-13 14:46   ` Rob Herring

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