diff --git a/include/sbi_utils/timer/fdt_timer.h b/include/sbi_utils/timer/fdt_timer.h
index cf105fed..555ebcba 100644
--- a/include/sbi_utils/timer/fdt_timer.h
+++ b/include/sbi_utils/timer/fdt_timer.h
@@ -16,7 +16,7 @@
 
 struct fdt_timer {
 	const struct fdt_match *match_table;
-	int (*cold_init)(void *fdt, int nodeoff, const struct fdt_match *match);
+	int (*cold_init)(const void *fdt, int nodeoff, const struct fdt_match *match);
 	int (*warm_init)(void);
 	void (*exit)(void);
 };
diff --git a/lib/utils/timer/fdt_timer.c b/lib/utils/timer/fdt_timer.c
index f4687304..aa0494e4 100644
--- a/lib/utils/timer/fdt_timer.c
+++ b/lib/utils/timer/fdt_timer.c
@@ -36,7 +36,7 @@ static int fdt_timer_cold_init(void)
 	int pos, noff, rc;
 	struct fdt_timer *drv;
 	const struct fdt_match *match;
-	void *fdt = fdt_get_address();
+	const void *fdt = fdt_get_address();
 
 	for (pos = 0; pos < fdt_timer_drivers_size; pos++) {
 		drv = fdt_timer_drivers[pos];
diff --git a/lib/utils/timer/fdt_timer_mtimer.c b/lib/utils/timer/fdt_timer_mtimer.c
index 9e27e3ab..458e8881 100644
--- a/lib/utils/timer/fdt_timer_mtimer.c
+++ b/lib/utils/timer/fdt_timer_mtimer.c
@@ -30,7 +30,7 @@ static SBI_LIST_HEAD(mtn_list);
 
 static struct aclint_mtimer_data *mt_reference = NULL;
 
-static int timer_mtimer_cold_init(void *fdt, int nodeoff,
+static int timer_mtimer_cold_init(const void *fdt, int nodeoff,
 				  const struct fdt_match *match)
 {
 	int rc;
diff --git a/lib/utils/timer/fdt_timer_plmt.c b/lib/utils/timer/fdt_timer_plmt.c
index e8be91b9..88a42e2a 100644
--- a/lib/utils/timer/fdt_timer_plmt.c
+++ b/lib/utils/timer/fdt_timer_plmt.c
@@ -13,7 +13,7 @@
 
 extern struct plmt_data plmt;
 
-static int fdt_plmt_cold_timer_init(void *fdt, int nodeoff,
+static int fdt_plmt_cold_timer_init(const void *fdt, int nodeoff,
 				    const struct fdt_match *match)
 {
 	int rc;