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From: Arnd Bergmann <arnd@kernel.org>
To: Rob Herring <robh+dt@kernel.org>
Cc: "Viresh Kumar" <viresh.kumar@linaro.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 V3 1/5] dt-bindings: virtio: Add binding for virtio devices
Date: Mon, 26 Jul 2021 23:20:13 +0200	[thread overview]
Message-ID: <CAK8P3a3bnOYNC-wqzQr+iv9EWGUX7gQA1tC2pPDKqav_m5r4fQ@mail.gmail.com> (raw)
In-Reply-To: <CAL_JsqLk8q6N2Sf43em57OXKkrQ7SW01GBnAEV1zzPMYQF7agA@mail.gmail.com>

On Mon, Jul 26, 2021 at 10:37 PM Rob Herring <robh+dt@kernel.org> wrote:
>
> On Mon, Jul 26, 2021 at 9:54 AM Arnd Bergmann <arnd@kernel.org> wrote:
> >
> > On Mon, Jul 26, 2021 at 4:57 PM Rob Herring <robh+dt@kernel.org> wrote:
> > > On Sun, Jul 25, 2021 at 10:52 PM Viresh Kumar <viresh.kumar@linaro.org> wrote:
> > > > +    description: |
> > > > +      Exactly one node describing the virtio device. The name of the node isn't
> > > > +      significant but its phandle can be used to by a user of the virtio device.
> > > > +
> > > > +  compatible:
> > > > +    pattern: "^virtio,[0-9a-f]+$"
> > >
> > > DID is only 4 chars? If so, "^virtio,[0-9a-f]{1,4}$"
> >
> > Any opinion on whether this should have any namespace prefix (or infix, I guess)
> > after "virtio,"?
> >
> > I previously suggested making it "virtio,device[0-9a-f]{1,4}$", which would
> > make it clearer that the following digits are the device ID rather
> > than something
> > else we might define in the future. Viresh picked this version because it's
> > somewhat more consistent with other subsystems.
>
> I'm fine either way, though I do find just a number a bit strange. So
> I'd lean toward adding 'device' or even just a 'd'.

I don't think just 'd' would be a good idea since it is indistinguishable from
a hexadecimal character. 'dev' would work though.

> BTW, what happens if/when the device protocol is rev'ed? A new DID or
> is there a separate revision that's discoverable?

This should normally be done using feature bits that are negotiated
between the two sides, and if only one side can do it, they use the
old revision.

There could be a new device ID but I don't think that has happened so far.

       Arnd

  reply	other threads:[~2021-07-26 21:20 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-26  4:51 [PATCH V3 0/5] virtio: Add virtio-device bindings Viresh Kumar
2021-07-26  4:51 ` [PATCH V3 1/5] dt-bindings: virtio: Add binding for virtio devices Viresh Kumar
2021-07-26 14:57   ` Rob Herring
2021-07-26 15:53     ` Arnd Bergmann
2021-07-26 20:36       ` Rob Herring
2021-07-26 21:20         ` Arnd Bergmann [this message]
2021-07-27  5:09     ` Viresh Kumar
2021-07-26  4:51 ` [PATCH V3 2/5] dt-bindings: i2c: Add bindings for i2c-virtio Viresh Kumar
2021-07-26  8:06   ` Arnd Bergmann
2021-07-26  8:11     ` Arnd Bergmann
2021-07-26  9:21       ` Viresh Kumar
2021-07-26 15:06   ` Rob Herring
2021-07-26  4:51 ` [PATCH V3 3/5] dt-bindings: gpio: Add bindings for gpio-virtio Viresh Kumar
2021-07-26  8:13   ` Arnd Bergmann
2021-07-26 15:11   ` Rob Herring
2021-07-26  4:51 ` [PATCH V3 4/5] uapi: virtio_ids: Sync ids with specification Viresh Kumar
2021-07-26  4:51 ` [PATCH V3 5/5] virtio: Bind virtio device to device-tree node Viresh Kumar
2021-09-13  9:19   ` Alexey Kardashevskiy
2021-09-13  9:45     ` Michael S. Tsirkin
2021-09-13 10:27       ` Alexey Kardashevskiy
2021-09-13 14:49   ` Guenter Roeck
2021-09-13 16:19     ` Guenter Roeck

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