linux-kernel - Re: [PATCH V2 5/5] virtio: Bind virtio device to device-tree node

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Message-ID: <20210723013000.h43nfnrrichg6nap@vireshk-i7>
Date:   Fri, 23 Jul 2021 07:00:00 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Bill Mills <bill.mills@...aro.org>,
        Alex Bennée <alex.bennee@...aro.org>,
        "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        Jie Deng <jie.deng@...el.com>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH V2 5/5] virtio: Bind virtio device to device-tree node

On 22-07-21, 16:52, Arnd Bergmann wrote:
> On Thu, Jul 22, 2021 at 11:56 AM Viresh Kumar <viresh.kumar@...aro.org> wrote:
> >
> > +/* Virtio device compatibles and IDs */
> > +static const struct of_device_id of_virtio_devices[] = {
> > +       { .compatible = "virtio,22", .data = (void *)VIRTIO_ID_I2C_ADAPTER },
> > +       { .compatible = "virtio,29", .data = (void *)VIRTIO_ID_GPIO },
> > +       { }
> > +};
> > +
> > +static int virtio_device_of_init(struct virtio_device *dev)
> > +{
> > +       struct device_node *np, *pnode = dev->dev.parent->of_node;
> > +       const struct of_device_id *match;
> > +       int ret, count;
> > +
> > +       if (!pnode)
> > +               return 0;
> > +
> > +       count = of_get_available_child_count(pnode);
> > +       if (!count)
> > +               return 0;
> > +
> > +       /* There can be only 1 child node */
> > +       if (WARN_ON(count > 1))
> > +               return -EINVAL;
> > +
> > +       np = of_get_next_available_child(pnode, NULL);
> > +       if (WARN_ON(!np))
> > +               return -ENODEV;
> > +
> > +       match = of_match_node(of_virtio_devices, np);
> > +       if (!match) {
> > +               ret = -ENODEV;
> > +               goto out;
> > +       }
> 
> I think it would be better not to have to enumerate the of_virtio_devices[]
> strings, but instead use of_device_is_compatible() to match against
> "virtio,%d". Otherwise we end up modifying this function for every
> virtio driver that needs a binding.

Yeah, will do that.

-- 
viresh