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

[Jjian Zhou (周建)]

On Thu, 2025-09-18 at 18:50 -0500, Jassi Brar wrote:
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> 
> On Thu, Aug 21, 2025 at 9:12 PM Jjian Zhou <jjian.zhou at mediatek.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
> 

The define "struct mbox_chan chan[1]" has style error.
ERROR:FLEXIBLE_ARRAY: Use C99 flexible arrays - see 
https://docs.kernel.org/process/deprecated.html#zero-length-and-one-element-arrays
#81: FILE: drivers/mailbox/mtk-vcp-mailbox.c:24:
+       struct mbox_chan chans[0];
+};

How about this error?

> ....
> > +
> > +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