linux-kernel - Re: [PATCH 11/13] mfd: pm8008: rework driver

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Date: Fri, 10 May 2024 16:15:43 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Johan Hovold <johan@...nel.org>
Cc: Johan Hovold <johan+linaro@...nel.org>, Lee Jones <lee@...nel.org>, 
	Mark Brown <broonie@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Liam Girdwood <lgirdwood@...il.com>, Das Srinagesh <quic_gurus@...cinc.com>, 
	Satya Priya <quic_c_skakit@...cinc.com>, Stephen Boyd <swboyd@...omium.org>, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 11/13] mfd: pm8008: rework driver

On Thu, May 9, 2024 at 12:42 PM Johan Hovold <johan@...nel.org> wrote:
> On Mon, May 06, 2024 at 10:18:58PM +0300, Andy Shevchenko wrote:
> > Mon, May 06, 2024 at 05:08:28PM +0200, Johan Hovold kirjoitti:

..

> > > +static void devm_irq_domain_fwnode_release(void *res)
> > > +{
> >
> > > +   struct fwnode_handle *fwnode = res;
> >
> > Unneeded line, can be
> >
> > static void devm_irq_domain_fwnode_release(void *fwnode)
> >
> > > +   irq_domain_free_fwnode(fwnode);
> > > +}
>
> I think I prefer it this way for clarity and for type safety in the
> unlikely even that the argument to irq_domain_free_fwnode() would ever
> change.

If it ever changes, the allocation part most likely would need an
update and since devm_add_action() takes this type of function, I
don't believe the argument would ever change from void * to something
else. With this it just adds an additional burden on the conversion.

> > > +   name = devm_kasprintf(dev, GFP_KERNEL, "%pOF-internal", dev->of_node);
> >
> > You are using fwnode for IRQ domain and IRQ domain core uses fwnode, why OF here?
> >
> >       name = devm_kasprintf(dev, GFP_KERNEL, "%pfw-internal", dev_fwnode(dev));
>
> This driver only support OF so why bother.

Sure, but it makes a bit of inconsistency. Besides that dereferencing
of_node might also add a burden one day we want to get rid of it or
move it somewhere else, or convert to the list_head or so.
dev_of_node(dev) in this case prevents from looking into this case.

-- 
With Best Regards,
Andy Shevchenko