linux-kernel - Re: [PATCH 11/14] MIPS: ath79: Add OF support to the GPIO driver

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Date:	Sat, 18 Apr 2015 18:57:21 +0200
From:	Alban <albeu@...e.fr>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Aban Bedel <albeu@...e.fr>, linux-mips@...ux-mips.org,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Qais Yousef <qais.yousef@...tec.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/14] MIPS: ath79: Add OF support to the GPIO driver

On Fri, 17 Apr 2015 16:53:31 +0200
Arnd Bergmann <arnd@...db.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@...e.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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