clk: at91: Add clock driver

The patch is referred to at91 clock driver of Linux, to make
the clock node descriptions in DT aligned with the Linux's.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile
new file mode 100644
index 0000000..fbe3cb6
--- /dev/null
+++ b/drivers/clk/at91/Makefile
@@ -0,0 +1,11 @@
+#
+# Makefile for at91 specific clk
+#
+
+obj-y += pmc.o sckc.o
+obj-y += clk-slow.o clk-main.o clk-plla.o clk-master.o
+obj-y += clk-system.o clk-peripheral.o
+
+obj-$(CONFIG_AT91_UTMI)		+= clk-utmi.o
+obj-$(CONFIG_AT91_H32MX)	+= clk-h32mx.o
+obj-$(CONFIG_AT91_GENERIC_CLK)	+= clk-generated.o