linux-kernel - Re: [PATCH] of/irq: introduce of_has_named

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Date:	Fri, 24 Jul 2015 12:26:19 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] of/irq: introduce of_has_named_irqs helper

On Fri, Jul 24, 2015 at 02:14:57PM -0500, Rob Herring wrote:
> On Fri, Jul 24, 2015 at 1:26 PM, Dmitry Torokhov
> <dmitry.torokhov@...il.com> wrote:
> > Sometimes drivers might wish to transition from index-based to named
> > interrupt descriptions. To aid in decision-making when parsing device
> > tree data let's provide a helper that will indicate the scheme that is
> > being used.
> 
> Generally, IRQs are retrieved by platform_get_irq or
> platform_get_irq_byname. Drivers should not call the of_irq_*
> functions directly in most cases.

That would be true for platform drivers, but not all devices are
platform devices.

> 
> >
> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> > ---
> >
> > The intent is to it like this:
> >
> >         if (of_has_named_irqs(np) {
> >                 /* Wake IRQ is optional */
> >                 dev->wakeirq = of_irq_get_byname(np, "wakeup");
> >                 if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
> >                         return dev->wakeirq;
> >         }
> 
> of_irq_get_byname will already return an error if the property is not
> present. Use that.

I do not like that it returns -EINVAL when property is missing, can we
change it to return -ENODATA (so it is the same as when the property is
defined but such name is missing)?

Thanks.

-- 
Dmitry
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