rockchip: rk3188: add timer3 node

Add dts node for timer3.
Because of the rockchip timer can only KNOWN "dtd_rockchip_rk3368_timer"
with OF_PLATDATA enable, so we override its compatible to
"rockchip,rk3368-timer".

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/arch/arm/dts/rk3188-radxarock-u-boot.dtsi b/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
index 5d650b1..26f5707 100644
--- a/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
+++ b/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
@@ -16,3 +16,9 @@
 	status = "okay";
 	u-boot,dm-spl;
 };
+
+&timer3 {
+	compatible = "rockchip,rk3368-timer", "rockchip,rk3288-timer";
+	u-boot,dm-spl;
+	clock-frequency = <24000000>;
+};
diff --git a/arch/arm/dts/rk3188.dtsi b/arch/arm/dts/rk3188.dtsi
index 1a06843..aeb5b80 100644
--- a/arch/arm/dts/rk3188.dtsi
+++ b/arch/arm/dts/rk3188.dtsi
@@ -123,6 +123,12 @@
 		};
 	};
 
+	timer3: timer@2000e000 {
+		compatible = "rockchip,rk3188-timer", "rockchip,rk3288-timer";
+		reg = <0x2000e000 0x20>;
+		interrupts = <GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
 	usbphy: phy {
 		compatible = "rockchip,rk3188-usb-phy", "rockchip,rk3288-usb-phy";
 		rockchip,grf = <&grf>;