linux-kernel - Re: Re: [PATCH] gpio MIPS/OCTEON: Add a driver for OCTEON's on-chip GPIO pins.

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Date:	Thu, 20 Jun 2013 11:18:44 -0700
From:	Joe Perches <joe@...ches.com>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	David Daney <david.daney@...ium.com>
Subject: Re: Re: [PATCH] gpio MIPS/OCTEON: Add a driver for OCTEON's on-chip
 GPIO pins.

On Thu, 2013-06-20 at 11:10 -0700, David Daney wrote:
> Sorry for not responding earlier, but my e-mail system seems to have 
> malfunctioned with respect to this message...
[]
> On 06/17/2013 01:51 AM, Linus Walleij wrote:
> >> +static int octeon_gpio_get(struct gpio_chip *chip, unsigned offset)
> >> +{
> >> +       struct octeon_gpio *gpio = container_of(chip, struct octeon_gpio, chip);
> >> +       u64 read_bits = cvmx_read_csr(gpio->register_base + RX_DAT);
> >> +
> >> +       return ((1ull << offset) & read_bits) != 0;
> >
> > A common idiom we use for this is:
> >
> > return !!(read_bits & (1ull << offset));
> 
> I hate that idiom, but if its use is a condition of accepting the patch, 
> I will change it.

Or use an even more common idiom and change the
function to return bool and let the compiler do it.


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