clk: uniphier: add Media I/O clock driver for UniPhier SoCs

This is the initial commit for the UniPhier clock drivers.
Currently, only the Media I/O clock is supported.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/clk/uniphier/Kconfig b/drivers/clk/uniphier/Kconfig
new file mode 100644
index 0000000..0e90c01
--- /dev/null
+++ b/drivers/clk/uniphier/Kconfig
@@ -0,0 +1,13 @@
+config CLK_UNIPHIER
+	bool
+	select CLK
+	select SPL_CLK
+
+menu "Clock drivers for UniPhier SoCs"
+	depends on CLK_UNIPHIER
+
+config CLK_UNIPHIER_MIO
+	bool "Clock driver for UniPhier Media I/O block"
+	default y
+
+endmenu