Date: Sat, 18 Apr 2015 18:57:21 +0200
From: Alban <albeu@free.fr>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Aban Bedel <albeu@free.fr>, linux-mips@linux-mips.org,
        Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Ralf Baechle <ralf@linux-mips.org>,
        Andrew Bresticker <abrestic@chromium.org>,
        Qais Yousef <qais.yousef@imgtec.com>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 11/14] MIPS: ath79: Add OF support to the GPIO driver
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On Fri, 17 Apr 2015 16:53:31 +0200
Arnd Bergmann <arnd@arndb.de> wrote:

> On Friday 17 April 2015 16:24:26 Alban Bedel wrote:
> > Replace the simple GPIO chip registration by a platform driver
> > and make ath79_gpio_init() just register the device.
> > 
> > Signed-off-by: Alban Bedel <albeu@free.fr>
> > ---
> >  arch/mips/ath79/dev-common.c | 13 ++++++++
> >  arch/mips/ath79/gpio.c       | 73
> > +++++++++++++++++++++++++++++++++++++++++--- 2 files changed, 81
> > insertions(+), 5 deletions(-)
> 
> Could you move the driver to drivers/gpio/ now?

Sure, I'll add a patch to move it there.

> > +void __init ath79_gpio_init(void)
> > +{
> > +	struct resource res;
> > +
> > +	memset(&res, 0, sizeof(res));
> > +
> > +	res.flags = IORESOURCE_MEM;
> > +	res.start = AR71XX_GPIO_BASE;
> > +	res.end = res.start + AR71XX_GPIO_SIZE - 1;
> > +
> > +	platform_device_register_simple("ath79-gpio", -1, &res, 1);
> > +}
> 
> Your code looks correct, but could be shortened to 
> 
> 	struct resource mem = DEFINE_RES_MEM(AR71XX_GPIO_BASE,
> AR71XX_GPIO_SIZE);

I'll do that.

> >  
> > -void __init ath79_gpio_init(void)
> > +static const struct of_device_id ath79_gpio_of_match[] = {
> > +	{
> > +		.compatible = "qca,ar7100-gpio",
> > +		.data = (void *)AR71XX_GPIO_COUNT,
> > +	},
> > +	{
> > +		.compatible = "qca,ar7240-gpio",
> > +		.data = (void *)AR7240_GPIO_COUNT,
> > +	},
> > +	{
> > +		.compatible = "qca,ar7241-gpio",
> > +		.data = (void *)AR7241_GPIO_COUNT,
> > +	},
> > +	{
> > +		.compatible = "qca,ar9130-gpio",
> > +		.data = (void *)AR913X_GPIO_COUNT,
> > +	},
> > +	{
> > +		.compatible = "qca,ar9330-gpio",
> > +		.data = (void *)AR933X_GPIO_COUNT,
> > +	},
> > +	{
> > +		.compatible = "qca,ar9340-gpio",
> > +		.data = (void *)AR934X_GPIO_COUNT,
> > +	},
> > +	{
> > +		.compatible = "qca,qca9550-gpio",
> > +		.data = (void *)QCA955X_GPIO_COUNT,
> > +	},
> > +	{},
> > +};
> 
> How about putting the number into an 'ngpios' property like some other
> bindings do?

I'll do that, it would make things simpler.

Alban
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