linux-kernel - Re: [PATCH v2] gpio: Add Avionic Design N-bit GPIO expander support

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Date:	Thu, 9 Aug 2012 22:20:54 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Wolfram Sang <w.sang@...gutronix.de>
Subject: Re: [PATCH v2] gpio: Add Avionic Design N-bit GPIO expander support

On Sun, Jul 29, 2012 at 07:13:57PM +0200, Linus Walleij wrote:
> On Mon, Jul 23, 2012 at 1:59 PM, Thierry Reding
> <thierry.reding@...onic-design.de> wrote:
> > +static __devinit int adnp_i2c_probe(struct i2c_client *client,
> > +                                   const struct i2c_device_id *id)
> > +{
> > +       struct adnp *gpio;
> > +       u32 num_gpios;
> > +       int err;
> > +
> > +       err = of_property_read_u32(client->dev.of_node, "nr-gpios",
> > +                                  &num_gpios);
> > +       if (err < 0)
> > +               return err;
> > +
> > +       client->irq = irq_of_parse_and_map(client->dev.of_node, 0);
> > +       if (client->irq == NO_IRQ)
> 
> Just if (!client->irq) since NO_IRQ is 0 nowadays.

At the risk of seeming pedantic, NO_IRQ is in fact quite often not 0.
However, irq_of_parse_and_map() returns 0 if the interrupt cannot be
parsed or mapped, so checking for !client->irq is, as you say, correct.

Thierry

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