clk: exynos: add clock driver for Exynos7420 Soc

Add a clock driver for Exynos7420 SoC. There are about 25 clock controller
blocks in Exynos7420 out of which support for topc, top0 and peric1 blocks
are added in this initial version of the driver.

Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/drivers/clk/exynos/Kconfig b/drivers/clk/exynos/Kconfig
new file mode 100644
index 0000000..eb0efa9
--- /dev/null
+++ b/drivers/clk/exynos/Kconfig
@@ -0,0 +1,18 @@
+config CLK_EXYNOS
+	bool
+	select CLK
+	help
+	  This enables support for common clock driver API on Samsung
+	  Exynos SoCs.
+
+menu "Clock drivers for Exynos SoCs"
+	depends on CLK_EXYNOS
+
+config CLK_EXYNOS7420
+	bool "Clock driver for Samsung's Exynos7420 SoC"
+	default y
+	help
+	  This enables common clock driver support for platforms based
+	  on Samsung Exynos7420 SoC.
+
+endmenu