ARM: dts: BCM63xx: Add ARMPLL device tree nodes

Add the ARM PLL controller which comes standard with the Cortex-A9 found
on the BCM63138 SoCs. This is the same controller as the one found in
the Broadcom iProc architecture, however, we have a separate compatible
string to indicate the integration difference, since the hardware is
different.

Signed-off-by: Florian Fainelli <[e-mail]>

arch/arm/boot/dts/bcm63138.dtsi

···
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		arm_timer_clk: arm_timer_clk {
-			#clock-cells = <0>;
-			compatible = "fixed-clock";
-			clock-frequency = <500000000>;
-		};
-
+		/* UBUS peripheral clock */
 		periph_clk: periph_clk {
 			#clock-cells = <0>;
 			compatible = "fixed-clock";
 			clock-frequency = <50000000>;
 			clock-output-names = "periph";
+		};
+
+		/* peripheral clock for system timer */
+		axi_clk: axi_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-factor-clock";
+			clocks = <&armpll>;
+			clock-div = <2>;
+			clock-mult = <1>;
+		};
+
+		/* APB bus clock */
+		apb_clk: apb_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-factor-clock";
+			clocks = <&armpll>;
+			clock-div = <4>;
+			clock-mult = <1>;
 		};
 	};
 
···
 			compatible = "arm,cortex-a9-global-timer";
 			reg = <0x1e200 0x20>;
 			interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-			clocks = <&arm_timer_clk>;
+			clocks = <&axi_clk>;
 		};
 
 		local_timer: local-timer@1e600 {
 			compatible = "arm,cortex-a9-twd-timer";
 			reg = <0x1e600 0x20>;
 			interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_HIGH>;
-			clocks = <&arm_timer_clk>;
+			clocks = <&axi_clk>;
 		};
 
 		twd_watchdog: watchdog@1e620 {
 			compatible = "arm,cortex-a9-twd-wdt";
 			reg = <0x1e620 0x20>;
 			interrupts = <GIC_PPI 14 IRQ_TYPE_LEVEL_HIGH>;
+		};
+
+		armpll: armpll {
+			#clock-cells = <0>;
+			compatible = "brcm,bcm63138-armpll";
+			clocks = <&periph_clk>;
+			reg = <0x20000 0xf00>;
 		};
 
 		pmb0: reset-controller@4800c0 {