misc: Add simple driver for some Nuvoton NCT6102D devices

This simple driver provides some functions to control some of the
integrated devices. The watchdog is enabled per default. This driver
adds a function to disable the watchdog. Also the internal legacy
UART (io address 0x3f8/0x2f8) is enabled per default.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Cc: Simon Glass <sjg@chromium.org>

include/nuvoton_nct6102d.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2016 Stefan Roese <sr@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _NUVOTON_NCT6102D_H_
+#define _NUVOTON_NCT6102D_H_
+
+/* I/O address of Nuvoton Super IO chip */
+#define NCT6102D_IO_PORT	0x4e
+
+/* Extended Function Enable Registers */
+#define NCT_EFER (NCT6102D_IO_PORT + 0)
+/* Extended Function Index Register (same as EFER) */
+#define NCT_EFIR (NCT6102D_IO_PORT + 0)
+/* Extended Function Data Register */
+#define NCT_EFDR (NCT_EFIR + 1)
+
+#define NCT_LD_SELECT_REG	0x07
+
+/* Logical device number */
+#define NCT6102D_LD_UARTA	0x02
+#define NCT6102D_LD_WDT		0x08
+
+#define NCT6102D_UARTA_ENABLE	0x30
+#define NCT6102D_WDT_TIMEOUT	0xf1
+
+#define NCT_ENTRY_KEY		0x87
+#define NCT_EXIT_KEY		0xaa
+
+int nct6102d_wdt_disable(void);
+
+#endif /* _NUVOTON_NCT6102D_H_ */