linux-kernel - Re: [PATCH v4 23/24] platform: Modify platform_get_irq

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Date: Mon, 8 Jan 2024 12:09:10 -0700
From: Mark Hasemeyer <markhas@...omium.org>
To: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: LKML <linux-kernel@...r.kernel.org>, Sudeep Holla <sudeep.holla@....com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Raul Rangel <rrangel@...omium.org>, Tzung-Bi Shih <tzungbi@...nel.org>, 
	David Gow <davidgow@...gle.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Mark Brown <broonie@...nel.org>, "Rafael J. Wysocki" <rafael@...nel.org>, Takashi Iwai <tiwai@...e.de>, 
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH v4 23/24] platform: Modify platform_get_irq_optional() to
 use resource

On Sat, Jan 6, 2024 at 7:56 AM Andy Shevchenko
<andriy.shevchenko@...el.com> wrote:
>
> On Tue, Jan 02, 2024 at 02:07:47PM -0700, Mark Hasemeyer wrote:
> > Unify handling of ACPI, GPIO, devictree, and platform resource
> > interrupts in platform_get_irq_optional(). Each of these subsystems
> > provide their own APIs which provide IRQ information as a struct
> > resource. This simplifies the logic of the function and allows callers
> > to get more information about the IRQ by looking at the resource flags.
> > For example, whether or not an IRQ is wake capable.
>
> ...
>
> > +     ret = fwnode_irq_get_resource(fwnode, num, r);
>
> I still prefer this not to return positive value. Since you _require_ @r to be
> not NULL, i.e. valid, the returning positive value makes no sense.
>
> > +     ret = ret < 0 ? ret : 0;
> > +     if (!ret || ret == -EPROBE_DEFER)
> > +             goto out;

I agree. But echoing my response from v3 patch 24:
- The fwnode patch is already reviewed and approved.
- The fwnode patch uses of_irq_to_resource() which already existed and
returns the irq number on success. The error handling translation will
just get pushed to the fwnode subsystem unless of_irq_to_resource() is
also modified which means updating 8 or so drivers that reference it.

I can either:
-Leave it
-Modify the fwnode subsystem to perform the error translation of
of_irq_to_resource()
-Modify the fwnode and OF subsystems and update all driver references

The fwnode and OF patches are already reviewed. I imagine coding
changes would imply dropping any Reviewed-by tags and requesting
another review?
I'd really prefer to not blow up the patch series anymore, but if you
feel strongly, we can come up with a solution.

>
> > +     struct resource *platform_res = platform_get_resource(dev, IORESOURCE_IRQ, num);
>
> Same comment, please split definition and assignment.

Will do.