Tegra: include: drivers: introduce spe.h

This patch introduces a header file for the spe-console driver. This
file currently provides a device struct and a registration function
call for clients.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Change-Id: Ic65c056f5bd60871d8a3f44f2c1210035f878799

plat/nvidia/tegra/include/drivers/spe.h

+/*
+ * Copyright (c) 2019, NVIDIA Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SPE_H
+#define SPE_H
+
+#include <stdint.h>
+
+#include <drivers/console.h>
+
+typedef struct {
+	console_t console;
+	uintptr_t base;
+} console_spe_t;
+
+/*
+ * Initialize a new spe console instance and register it with the console
+ * framework. The |console| pointer must point to storage that will be valid
+ * for the lifetime of the console, such as a global or static local variable.
+ * Its contents will be reinitialized from scratch.
+ */
+int console_spe_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
+			   console_spe_t *console);
+
+#endif /* SPE_H */