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/pmc.h b/drivers/clk/at91/pmc.h
new file mode 100644
index 0000000..5444c84
--- /dev/null
+++ b/drivers/clk/at91/pmc.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2016 Atmel Corporation
+ *               Wenyou.Yang <wenyou.yang@atmel.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __AT91_PMC_H__
+#define __AT91_PMC_H__
+
+struct pmc_platdata {
+	struct at91_pmc *reg_base;
+};
+
+int at91_pmc_core_probe(struct udevice *dev);
+int at91_pmc_clk_node_bind(struct udevice *dev);
+
+#endif