linux-kernel - Re: [PATCH v15] i2c: virtio: add a virtio i2c frontend driver

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Date:   Fri, 23 Jul 2021 11:03:37 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Jie Deng <jie.deng@...el.com>
Cc:     Linux I2C <linux-i2c@...r.kernel.org>,
        "open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE" 
        <virtualization@...ts.linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Wolfram Sang <wsa@...nel.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Jason Wang <jasowang@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        yu1.wang@...el.com, conghui.chen@...el.com,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        gregkh <gregkh@...uxfoundation.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Alex Bennée <alex.bennee@...aro.org>,
        jiedeng@...mni.sjtu.edu.cn
Subject: Re: [PATCH v15] i2c: virtio: add a virtio i2c frontend driver

On Fri, Jul 23, 2021 at 7:44 AM Jie Deng <jie.deng@...el.com> wrote:

> +
> +       ret = virtio_i2c_setup_vqs(vi);
> +       if (ret)
> +               return ret;
> +
> +       vi->adap.owner = THIS_MODULE;
> +       snprintf(vi->adap.name, sizeof(vi->adap.name),
> +                "i2c_virtio at virtio bus %d", vdev->index);
> +       vi->adap.algo = &virtio_algorithm;
> +       vi->adap.quirks = &virtio_i2c_quirks;
> +       vi->adap.dev.parent = &vdev->dev;
> +       i2c_set_adapdata(&vi->adap, vi);
> +
> +       /*
> +        * Setup ACPI node for controlled devices which will be probed through
> +        * ACPI.
> +        */
> +       ACPI_COMPANION_SET(&vi->adap.dev, ACPI_COMPANION(pdev));

Since there is now a generic way for virtio drivers to link up with OF
device nodes, maybe this should be handled the same way in the
virtio core rather than the driver?

> index 70a8057a..99aa27b 100644
> --- a/include/uapi/linux/virtio_ids.h
> +++ b/include/uapi/linux/virtio_ids.h
> @@ -55,6 +55,7 @@
>  #define VIRTIO_ID_FS                   26 /* virtio filesystem */
>  #define VIRTIO_ID_PMEM                 27 /* virtio pmem */
>  #define VIRTIO_ID_MAC80211_HWSIM       29 /* virtio mac80211-hwsim */
> +#define VIRTIO_ID_I2C_ADAPTER          34 /* virtio i2c adapter */
>  #define VIRTIO_ID_BT                   40 /* virtio bluetooth */

This will now conflict with Viresh's patch that adds all the other IDs.
Not sure if there is anything to be done about that.

       Arnd