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

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Date:	Thu, 24 May 2012 05:17:37 +0530
From:	Thomas Abraham <thomas.abraham@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linus.walleij@...aro.org,
	grant.likely@...retlab.ca, kgene.kim@...sung.com,
	kyungmin.park@...sung.com, patches@...aro.org
Subject: [PATCH 3/3] gpio: exynos4: skip gpiolib registration if pinctrl driver is used

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>
---
 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

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