linux-kernel - Re: [PATCH v5 2/2] mailbox: mediatek: Add mtk-vcp-mailbox driver

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Message-ID: <CAGXv+5F-L2+4PGixx7OG2+vp2yXc_2885yMzqWtkQDwhxVAPxw@mail.gmail.com>
Date: Fri, 19 Sep 2025 16:31:44 +0800
From: Chen-Yu Tsai <wenst@...omium.org>
To: Jassi Brar <jassisinghbrar@...il.com>
Cc: Jjian Zhou <jjian.zhou@...iatek.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mediatek@...ts.infradead.org, 
	Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v5 2/2] mailbox: mediatek: Add mtk-vcp-mailbox driver

On Fri, Sep 19, 2025 at 7:50 AM Jassi Brar <jassisinghbrar@...il.com> wrote:
>
> On Thu, Aug 21, 2025 at 9:12 PM Jjian Zhou <jjian.zhou@...iatek.com> wrote:
>
> .....
>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/slab.h>
> > +
> > +struct mtk_vcp_mbox_priv {
> Maybe 'mtk_vcp_mbox' is a more appropriate name ?
>
> > +       void __iomem *base;
> > +       struct device *dev;
> > +       struct mbox_controller mbox;
> > +       const struct mtk_vcp_mbox_cfg *cfg;
> > +       struct mtk_ipi_info ipi_recv;
>
> Maybe also have "struct mbox_chan chan[1]; " so that you don't have to
> allocate one during the probe.

> Also if you have  "struct mbox_controller mbox;" as the first member,
> you could simply typecast that to get this structure.
> Something like "struct mpfs_mbox" in mailbox-mpfs.c

I read somewhere that this way of subclassing is not recommended.
Instead the base class should explicitly not be the first member.
And then container_of() should be used.

I don't remember where I read this though. But I think the explicit
container_of() is easier for understanding the intent.

ChenYu

> ....
> > +
> > +static struct mbox_chan *mtk_vcp_mbox_xlate(struct mbox_controller *mbox,
> > +                                           const struct of_phandle_args *sp)
> > +{
> > +       if (sp->args_count)
> > +               return NULL;
> > +
> > +       return mbox->chans;
>
> return &mbox->chans[0]   seems better.
>
> thnx