linux-kernel - Re: [PATCH v9 4/4] remoteproc: virtio: Create platform device for the remoteproc

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Message-ID: <20221004143954.GA1479221-robh@kernel.org>
Date:   Tue, 4 Oct 2022 09:39:54 -0500
From:   Rob Herring <robh@...nel.org>
To:     Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        Christoph Hellwig <hch@....de>,
        Stefano Stabellini <stefanos@...inx.com>,
        Bruce Ashfield <bruce.ashfield@...inx.com>
Subject: Re: [PATCH v9 4/4] remoteproc: virtio: Create platform device for
 the remoteproc_virtio

On Wed, Sep 21, 2022 at 03:50:44PM +0200, Arnaud Pouliquen wrote:
> Define a platform driver to manage the remoteproc virtio device as
> a platform devices.
> 
> The platform device allows to pass rproc_vdev_data platform data to
> specify properties that are stored in the rproc_vdev structure.
> 
> Such approach will allow to preserve legacy remoteproc virtio device
> creation but also to probe the device using device tree mechanism.
> 
> remoteproc_virtio.c update:
>   - Add rproc_virtio_driver platform driver. The probe ops replaces
>     the rproc_rvdev_add_device function.
>   - All reference to the rvdev->dev has been updated to rvdev-pdev->dev.
>   - rproc_rvdev_release is removed as associated to the rvdev device.
>   - The use of rvdev->kref counter is replaced by get/put_device on the
>     remoteproc virtio platform device.
>   - The vdev device no longer increments rproc device counter.
>     increment/decrement is done in rproc_virtio_probe/rproc_virtio_remove
>     function in charge of the vrings allocation/free.
> 
> remoteproc_core.c update:
>   Migrate from the rvdev device to the rvdev platform device.
>   From this patch, when a vdev resource is found in the resource table
>   the remoteproc core register a platform device.
> 
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>  drivers/remoteproc/remoteproc_core.c     |  12 +-
>  drivers/remoteproc/remoteproc_internal.h |   2 -
>  drivers/remoteproc/remoteproc_virtio.c   | 143 ++++++++++++-----------
>  include/linux/remoteproc.h               |   6 +-
>  4 files changed, 82 insertions(+), 81 deletions(-)

[...]

> +/* Platform driver */
> +static const struct of_device_id rproc_virtio_match[] = {
> +	{ .compatible = "virtio,rproc" },

This is not documented. Add a binding schema if you need DT support.

> +	{},
> +};
> +
> +static struct platform_driver rproc_virtio_driver = {
> +	.probe		= rproc_virtio_probe,
> +	.remove		= rproc_virtio_remove,
> +	.driver		= {
> +		.name	= "rproc-virtio",
> +		.of_match_table	= rproc_virtio_match,
> +	},
> +};