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

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Message-ID: <CACRpkdaSk9xBaiSAKCj4Pa2kyyfP178XN53i2Q2+CBFx=RoE0g@mail.gmail.com>
Date:	Fri, 10 Aug 2012 10:19:02 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Thierry Reding <thierry.reding@...onic-design.de>
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>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [PATCH v2] gpio: Add Avionic Design N-bit GPIO expander support

On Thu, Aug 9, 2012 at 10:20 PM, Thierry Reding
<thierry.reding@...onic-design.de> wrote:
> On Sun, Jul 29, 2012 at 07:13:57PM +0200, Linus Walleij wrote:
>> > +       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.

No. A year back, yes, but not anymore. We went to great lengths in the
ARM architecture to ensure NO_IRQ is *always 0. Russell spent
a lot of time on this.

Consult the following article on LWN:
http://lwn.net/Articles/470820/

Then grep your gitlog and you'll see we got rid of it from ARM.

If this driver is for some other arch like openrisc I might accept
it but please reconsider.

Yours,
Linus Walleij
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