gpio: samsung: Skip registration if pinctrl driver is present on EXYNOS4X12

This patch modifies the Samsung GPIO driver to check for pinctrl driver
presence earlier and use generic matching instead of a single compatible
value.

This allows us to fix warning about unrecognized SoC in case of
EXYNOS4X12, which is not supported by this driver.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 22 insertions, 21 deletions

diff --git a/drivers/gpio/gpio-samsung.c b/drivers/gpio/gpio-samsung.c
index a006f0db15af..88f41e51565b 100644
--- a/drivers/gpio/gpio-samsung.c
+++ b/drivers/gpio/gpio-samsung.c
@@ -2797,27 +2797,6 @@ static __init void exynos4_gpiolib_init(void)
         int group = 0;
         void __iomem *gpx_base;
 
-#ifdef CONFIG_PINCTRL_SAMSUNG
-                /*
-                 * 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;
-#endif
-
         /* gpio part1 */
         gpio_base1 = ioremap(EXYNOS4_PA_GPIO1, SZ_4K);
         if (gpio_base1 == NULL) {
@@ -3032,6 +3011,28 @@ static __init int samsung_gpiolib_init(void)
         int i, nr_chips;
         int group = 0;
 
+#ifdef CONFIG_PINCTRL_SAMSUNG
+        /*
+        * 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;
+        static const struct of_device_id exynos_pinctrl_ids[] = {
+                { .compatible = "samsung,pinctrl-exynos4210", },
+                { .compatible = "samsung,pinctrl-exynos4x12", },
+        };
+        for_each_matching_node(pctrl_np, exynos_pinctrl_ids)
+                if (pctrl_np && of_device_is_available(pctrl_np))
+                        return -ENODEV;
+#endif
+
         samsung_gpiolib_set_cfg(samsung_gpio_cfgs, ARRAY_SIZE(samsung_gpio_cfgs));
 
         if (soc_is_s3c24xx()) {