linux-kernel - Re: [PATCH 1/4 v3] GPIO: gpio-dwapb: Enable platform driver binding to MFD driver

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Message-ID: <alpine.DEB.2.02.1409101353500.2790@atx-linux-37>
Date:	Wed, 10 Sep 2014 14:11:19 -0500
From:	atull <atull@...nsource.altera.com>
To:	Weike Chen <alvin.chen@...el.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, <linux-gpio@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	Boon Leong Ong <boon.leong.ong@...el.com>,
	Hock Leong Kweh <hock.leong.kweh@...el.com>,
	Darren Hart <dvhart@...ux.intel.com>,
	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
	Mika Westerberg <mika.westerberg@...el.com>,
	Andriy Shevchenko <andriy.shevchenko@...el.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/4 v3] GPIO: gpio-dwapb: Enable platform driver binding
 to MFD driver

On Tue, 9 Sep 2014, Weike Chen wrote:

> The Synopsys DesignWare APB GPIO driver only supports open firmware devices.
> But, like Intel Quark X1000 SOC, which has a single PCI function exporting
> a GPIO and an I2C controller, it is a Multifunction device. This patch is
> to enable the current Synopsys DesignWare APB GPIO driver to support the
> Multifunction device which exports the designware GPIO controller.
> 
> Reviewed-by: Hock Leong Kweh <hock.leong.kweh@...el.com>
> Signed-off-by: Weike Chen <alvin.chen@...el.com>

Hi Alvin,

I did a quick test and this looks like it works for me (with device tree).
I had a couple of small fixes below.

Alan

>  
> -	port->bgc.gc.ngpio = ngpio;
> -	port->bgc.gc.of_node = port_np;
> +#ifdef CONFIG_OF_GPIO
> +	port->bgc.gc.of_node = pp->node;
> +#endif

Please use 'if (IS_ENABLED(CONFIG_OF_GPIO)) as a conditional as you do
elsewhere.

>  static int dwapb_gpio_probe(struct platform_device *pdev)
>  {
> +	int i;
>  	struct resource *res;
>  	struct dwapb_gpio *gpio;
> -	struct device_node *np;
>  	int err;
> -	unsigned int offs = 0;
> +	struct device *dev = &pdev->dev;
> +	struct dwapb_platform_data *pdata = dev_get_platdata(dev);
> +	bool is_pdata_alloc = !pdata;

Please combine the int's in one line (int err, i;) and put them as
the last one on this list.  It looks the same to the compiler of
course, but more uniform for human eyes :)

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