diff --git a/arch/powerpc/platforms/powermac/feature.c b/arch/powerpc/platforms/powermac/feature.c
index 13fcaf5..e49621b 100644
--- a/arch/powerpc/platforms/powermac/feature.c
+++ b/arch/powerpc/platforms/powermac/feature.c
@@ -1058,8 +1058,8 @@
 	if (np == NULL)
 		return -ENODEV;
 	for (np = np->child; np != NULL; np = np->sibling) {
-		u32 *num = get_property(np, "reg", NULL);
-		u32 *rst = get_property(np, "soft-reset", NULL);
+		const u32 *num = get_property(np, "reg", NULL);
+		const u32 *rst = get_property(np, "soft-reset", NULL);
 		if (num == NULL || rst == NULL)
 			continue;
 		if (param == *num) {
diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c
index 653eeb6..1949b65 100644
--- a/arch/powerpc/platforms/powermac/smp.c
+++ b/arch/powerpc/platforms/powermac/smp.c
@@ -702,7 +702,7 @@
 	/* GPIO based HW sync on ppc32 Core99 */
 	if (pmac_tb_freeze == NULL && !machine_is_compatible("MacRISC4")) {
 		struct device_node *cpu;
-		u32 *tbprop = NULL;
+		const u32 *tbprop = NULL;
 
 		core99_tb_gpio = KL_GPIO_TB_ENABLE;	/* default value */
 		cpu = of_find_node_by_type(NULL, "cpu");
diff --git a/drivers/char/briq_panel.c b/drivers/char/briq_panel.c
index a0e5eac..caae795 100644
--- a/drivers/char/briq_panel.c
+++ b/drivers/char/briq_panel.c
@@ -202,7 +202,7 @@
 static int __init briq_panel_init(void)
 {
 	struct device_node *root = find_path_device("/");
-	char *machine;
+	const char *machine;
 	int i;
 
 	machine = get_property(root, "model", NULL);
diff --git a/drivers/video/riva/fbdev.c b/drivers/video/riva/fbdev.c
index 67d1e1c..61a4665 100644
--- a/drivers/video/riva/fbdev.c
+++ b/drivers/video/riva/fbdev.c
@@ -1827,7 +1827,7 @@
 	struct riva_par *par = info->par;
 	struct device_node *dp;
 	unsigned char *pedid = NULL;
-	unsigned char *disptype = NULL;
+	const unsigned char *disptype = NULL;
 	static char *propnames[] = {
 		"DFP,EDID", "LCD,EDID", "EDID", "EDID1", "EDID,B", "EDID,A", NULL };
 	int i;