linux-kernel - Re: [PATCH 3/3] gpio: exynos4: skip gpiolib registration if pinctrl driver is used

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Message-Id: <20120526004409.A59FD3E1E15@localhost>
Date:	Fri, 25 May 2012 18:44:09 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Thomas Abraham <thomas.abraham@...aro.org>,
	linux-kernel@...r.kernel.org
Cc:	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linus.walleij@...aro.org,
	kgene.kim@...sung.com, kyungmin.park@...sung.com,
	patches@...aro.org
Subject: Re: [PATCH 3/3] gpio: exynos4: skip gpiolib registration if pinctrl driver is used

On Thu, 24 May 2012 05:17:37 +0530, Thomas Abraham <thomas.abraham@...aro.org> wrote:
> Pinctrl driver, when enabled, registers all the gpio pins and hence the
> registration of gpio pins by this driver can be skipped.
> 
> Signed-off-by: Thomas Abraham <thomas.abraham@...aro.org>

Acked-by: Grant Likely <grant.likely@...retlab.ca>

> ---
>  drivers/gpio/gpio-samsung.c |   21 +++++++++++++++++++++
>  1 files changed, 21 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-samsung.c b/drivers/gpio/gpio-samsung.c
> index 19d6fc0..34a9638 100644
> --- a/drivers/gpio/gpio-samsung.c
> +++ b/drivers/gpio/gpio-samsung.c
> @@ -2788,6 +2788,27 @@ static __init int samsung_gpiolib_init(void)
>  #ifdef CONFIG_CPU_EXYNOS4210
>  		void __iomem *gpx_base;
>  
> +#ifdef CONFIG_OF
> +		/*
> +		 * This gpio driver includes support for device tree support and
> +		 * there are platforms using it. In order to maintain
> +		 * compatibility with those platforms, and to allow non-dt
> +		 * Exynos4210 platforms to use this gpiolib support, a check
> +		 * is added to find out if there is a active pin-controller
> +		 * driver support available. If it is available, this gpiolib
> +		 * support is ignored and the gpiolib support available in
> +		 * pin-controller driver is used. This is a temporary check and
> +		 * will go away when all of the Exynos4210 platforms have
> +		 * switched to using device tree and the pin-ctrl driver.
> +		 */
> +		struct device_node *pctrl_np;
> +		const char *pctrl_compat = "samsung,pinctrl-exynos4210";
> +		pctrl_np = of_find_compatible_node(NULL, NULL, pctrl_compat);
> +		if (pctrl_np)
> +			if (of_device_is_available(pctrl_np))
> +				return -ENODEV;
> +#endif
> +
>  		/* gpio part1 */
>  		gpio_base1 = ioremap(EXYNOS4_PA_GPIO1, SZ_4K);
>  		if (gpio_base1 == NULL) {
> -- 
> 1.6.6.rc2
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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