ARM: EXYNOS: add platform device for core DRM subsystem

Add platform device for Exynos DRM core. This device is used
for creating DRM user-space device and allocating memory for
display buffers.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-exynos/dev-drm.c b/arch/arm/mach-exynos/dev-drm.c
new file mode 100644
index 0000000..17c9c6e
--- /dev/null
+++ b/arch/arm/mach-exynos/dev-drm.c
@@ -0,0 +1,29 @@
+/*
+ * linux/arch/arm/mach-exynos/dev-drm.c
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * EXYNOS - core DRM device
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+
+#include <plat/devs.h>
+
+static u64 exynos_drm_dma_mask = DMA_BIT_MASK(32);
+
+struct platform_device exynos_device_drm = {
+	.name	= "exynos-drm",
+	.dev	= {
+		.dma_mask		= &exynos_drm_dma_mask,
+		.coherent_dma_mask	= DMA_BIT_MASK(32),
+	}
+};