linux-kernel - Re: [PATCH 06/13] media: davinci: vpif: Use platform_get_irq

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Date:   Thu, 6 Jan 2022 15:43:30 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Rob Herring <robh+dt@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH 06/13] media: davinci: vpif: Use platform_get_irq_optional()
 to get the interrupt

On Wed, Jan 5, 2022 at 7:41 PM Lad, Prabhakar
<prabhakar.csengg@...il.com> wrote:
> On Wed, Jan 5, 2022 at 9:43 AM Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> > On Tue, Jan 4, 2022 at 7:23 PM Lad, Prabhakar
> > <prabhakar.csengg@...il.com> wrote:
> > > On Sat, Dec 25, 2021 at 5:32 PM Andy Shevchenko
> > > <andy.shevchenko@...il.com> wrote:
> > > > On Sat, Dec 25, 2021 at 3:04 AM Lad Prabhakar
> > > > <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> >
> > ...
> >
> > > > > +       res_irq->flags = IORESOURCE_IRQ | irq_get_trigger_type(irq);
> > > > > +       res_irq->start = irq;
> > > > > +       res_irq->end = irq;
> > > > > +       res_irq->name = dev_of_node(&pdev->dev) ? of_node_full_name(pdev->dev.of_node) : NULL;
> > > >
> > > > If you convert DEFINE_RES_NAMED() to return a compound literal, then
> > > > you may use it here like
> > > >
> > > > res_irq = DEFINE_RES_NAMED(...);
> > > >
> > > > or even do like this
> > > >
> > > > if (dev_of_node(...))
> > > >   res_irq = DEFINE_RES_IRQ_NAMED(...)
> > > > else
> > > >   res_irq = DEFINE_RES_IRQ(...);
> > > > res_irq->flags |= irq_get_trigger_type(irq);
> > > >
> > > There are quite a few users of DEFINE_RES_IRQ_NAMED()/DEFINE_RES_IRQ()
> > > changing this macos just for this single user tree wide doesn't make
> > > sense. Let me know if you think otherwise.
> >
> > Converting them to produce compound literal is straightforward and
> > does not require changes in the users. But on the other hand it allows
> > you to use it and convert existing users to use that form directly.
> > You may conduct research on how macros in the property.h were morphing
> > towards that.
> >
> Thank you for the pointer. I did the below change for this.
>
> diff --git a/include/linux/ioport.h b/include/linux/ioport.h
> index 8359c50f9988..da1208e8f164 100644
> --- a/include/linux/ioport.h
> +++ b/include/linux/ioport.h
> @@ -153,7 +153,7 @@ enum {
>
>  /* helpers to define resources */
>  #define DEFINE_RES_NAMED(_start, _size, _name, _flags)                 \
> -       {                                                               \
> +       (struct resource) {                                     \

Yep, that's it.

>                 .start = (_start),                                      \
>                 .end = (_start) + (_size) - 1,                          \
>                 .name = (_name),                                        \
>
> But there are some instances which need to be touched, for example
> vexpress-sysreg.c [1]. Are you OK with files to be changed?

Nice! That's exactly my point and you can sell it to the community
because there are already users of it like this.

Yes, I'm fine, but it seems it needs to be done treewide in one patch.
Btw, how many of those already in use?


> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/mfd/vexpress-sysreg.c?h=v5.16-rc8#n65



-- 
With Best Regards,
Andy Shevchenko