Re: [PATCH v4 14/16] firmware: arm_scmi: Add virtio transport

[Peter Hilber <peter.hilber@opensynergy.com>]

On 11.06.21 18:59, Cristian Marussi wrote:

<snip>

> +static struct virtio_driver virtio_scmi_driver = {
> +	.driver.name = "scmi-virtio",
> +	.driver.owner = THIS_MODULE,
> +	.feature_table = features,
> +	.feature_table_size = ARRAY_SIZE(features),
> +	.id_table = id_table,
> +	.probe = scmi_vio_probe,
> +	.remove = scmi_vio_remove,
> +};
> +

It might be good to also check for the VIRTIO_F_VERSION_1 feature bit in 
the optional .validate op (not yet implemented above), as some other 
devices do (quoting virtio-snd in the following):

> /**
>  * virtsnd_validate() - Validate if the device can be started.
>  * @vdev: VirtIO parent device.
>  *
>  * Context: Any context.
>  * Return: 0 on success, -EINVAL on failure.
>  */
> static int virtsnd_validate(struct virtio_device *vdev)
> {

<snip>

> 
> 	if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
> 		dev_err(&vdev->dev,
> 			"device does not comply with spec version 1.x\n");
> 		return -EINVAL;
> 	}
> 

<snip>

> 
> static struct virtio_driver virtsnd_driver = {
> 	.driver.name = KBUILD_MODNAME,
> 	.driver.owner = THIS_MODULE,
> 	.id_table = id_table,
> 	.validate = virtsnd_validate,

(end of virtio-snd quote)