diff --git a/arch/arm/boot/dts/r8a7742-iwg21d-q7.dts b/arch/arm/boot/dts/r8a7742-iwg21d-q7.dts
index b3461a61a4bf..df85e516a3c0 100644
--- a/arch/arm/boot/dts/r8a7742-iwg21d-q7.dts
+++ b/arch/arm/boot/dts/r8a7742-iwg21d-q7.dts
@@ -159,6 +159,18 @@ &pci2 {
 	/* status = "okay"; */
 };
 
+&pcie_bus_clk {
+	clock-frequency = <100000000>;
+};
+
+&pciec {
+	/* SW2[6] determines which connector is activated
+	 * ON = PCIe X4 (connector-J7)
+	 * OFF = mini-PCIe (connector-J26)
+	 */
+	status = "okay";
+};
+
 &pfc {
 	avb_pins: avb {
 		groups = "avb_mdio", "avb_gmii";