[opensbi] create opensbi from T-Head official:

repo: https://github.com/T-head-Semi/opensbi
	commit: 89182b257c8798e15e4c685c1af0c2862d528d2a

Change-Id: I7b39d66729e0108661a6f4c9e28acbdb303684ea

opensbi/lib/utils/timer/fdt_timer_clint.c

@@ -0,0 +1,50 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ */
+
+#include <sbi/sbi_error.h>
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/timer/fdt_timer.h>
+#include <sbi_utils/sys/clint.h>
+
+#define CLINT_TIMER_MAX_NR			16
+
+static unsigned long clint_timer_count = 0;
+static struct clint_data clint_timer[CLINT_TIMER_MAX_NR];
+
+static int timer_clint_cold_init(void *fdt, int nodeoff,
+				  const struct fdt_match *match)
+{
+	int rc;
+	struct clint_data *ct, *ctmaster = NULL;
+
+	if (CLINT_TIMER_MAX_NR <= clint_timer_count)
+		return SBI_ENOSPC;
+	ct = &clint_timer[clint_timer_count++];
+	if (1 < clint_timer_count)
+		ctmaster = &clint_timer[0];
+
+	rc = fdt_parse_clint_node(fdt, nodeoff, TRUE, ct);
+	if (rc)
+		return rc;
+
+	return clint_cold_timer_init(ct, ctmaster);
+}
+
+static const struct fdt_match timer_clint_match[] = {
+	{ .compatible = "riscv,clint0" },
+	{ .compatible = "sifive,clint0" },
+	{ },
+};
+
+struct fdt_timer fdt_timer_clint = {
+	.match_table = timer_clint_match,
+	.cold_init = timer_clint_cold_init,
+	.warm_init = clint_warm_timer_init,
+	.exit = NULL,
+};