diff --git a/package-21.02/kernel/tops/src/trm-fs.c b/package-21.02/kernel/tops/src/trm-fs.c
new file mode 100644
index 0000000..f2bd9bf
--- /dev/null
+++ b/package-21.02/kernel/tops/src/trm-fs.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2023 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Alvin Kuo <alvin.kuog@mediatek.com>
+ *         Ren-Ting Wang <ren-ting.wang@mediatek.com>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/relay.h>
+
+#include "trm-fs.h"
+#include "trm-mcu.h"
+#include "trm.h"
+
+#define RLY_RETRY_NUM				3
+
+static struct dentry *debugfs_dir;
+static struct rchan *relay;
+static bool trm_fs_is_init;
+
+bool mtk_trm_fs_is_init(void)
+{
+	return trm_fs_is_init;
+}
+
+void *mtk_trm_fs_relay_reserve(u32 size)
+{
+	u32 rty = 0;
+	void *dst;
+
+	while (rty < RLY_RETRY_NUM) {
+		dst = relay_reserve(relay, size);
+		if (likely(dst))
+			return dst;
+
+		if (rty++ < 3)
+			msleep(100);
+		else
+			break;
+	}
+
+	return ERR_PTR(-ENOMEM);
+}
+
+void mtk_trm_fs_relay_flush(void)
+{
+	relay_flush(relay);
+}
+
+static struct dentry *trm_fs_create_buf_file_cb(const char *filename,
+						struct dentry *parent,
+						umode_t mode,
+						struct rchan_buf *buf,
+						int *is_global)
+{
+	struct dentry *debugfs_file;
+
+	debugfs_file = debugfs_create_file("dump_data", mode,
+					   parent, buf,
+					   &relay_file_operations);
+
+	*is_global = 1;
+
+	return debugfs_file;
+}
+
+static int trm_fs_remove_buf_file_cb(struct dentry *debugfs_file)
+{
+	debugfs_remove(debugfs_file);
+
+	return 0;
+}
+
+int mtk_trm_fs_init(void)
+{
+	static struct rchan_callbacks relay_cb = {
+		.create_buf_file = trm_fs_create_buf_file_cb,
+		.remove_buf_file = trm_fs_remove_buf_file_cb,
+	};
+	int ret = 0;
+
+	if (!debugfs_dir) {
+		debugfs_dir = debugfs_create_dir("tops", NULL);
+		if (IS_ERR(debugfs_dir)) {
+			ret = PTR_ERR(debugfs_dir);
+			goto out;
+		}
+	}
+
+	if (!relay) {
+		relay = relay_open("dump_data", debugfs_dir,
+				   RLY_DUMP_SUBBUF_SZ,
+				   RLY_DUMP_SUBBUF_NUM,
+				   &relay_cb, NULL);
+		if (!relay) {
+			ret = -EINVAL;
+			goto err_debugfs_remove;
+		}
+	}
+
+	relay_reset(relay);
+
+	trm_fs_is_init = true;
+
+out:
+	return ret;
+
+err_debugfs_remove:
+	trm_fs_is_init = false;
+
+	debugfs_remove(debugfs_dir);
+
+	debugfs_dir = NULL;
+
+	return ret;
+}
+
+void mtk_trm_fs_deinit(void)
+{
+	trm_fs_is_init = false;
+
+	relay_close(relay);
+
+	debugfs_remove(debugfs_dir);
+}