diff --git a/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi b/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi
index 61415559b7..d88dee8057 100644
--- a/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi
+++ b/arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi
@@ -13,3 +13,30 @@
 &uart0 {
 	bootph-all;
 };
+
+&pinctrl {
+	bootph-some-ram;
+
+	uart0 {
+		bootph-some-ram;
+	};
+	rtc {
+		bootph-some-ram;
+	};
+};
+
+&uart0_xfer {
+	bootph-some-ram;
+};
+
+&uart0_cts {
+	bootph-some-ram;
+};
+
+&uart0_rts {
+	bootph-some-ram;
+};
+
+&rtc_32k {
+	bootph-some-ram;
+};