stm32x7: add support for stm32x7 serial driver

This patch adds support for stm32f7 family usart peripheral.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

include/dm/platform_data/serial_stm32x7.h

@@ -0,0 +1,17 @@
+/*
+ * (C) Copyright 2016
+ * Vikas Manocha, <vikas.manocha@st.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __SERIAL_STM32x7_H
+#define __SERIAL_STM32x7_H
+
+/* Information about a serial port */
+struct stm32x7_serial_platdata {
+	struct stm32_usart *base;  /* address of registers in physical memory */
+	unsigned int clock;
+};
+
+#endif /* __SERIAL_STM32x7_H */