ARM: dts: da850-lego-ev3: enable cpufreq

Add a fixed regulator for the LEGO EV3 board along with board-specific
CPU configuration.

Signed-off-by: David Lechner <[e-mail]>
Signed-off-by: Bartosz Golaszewski <[e-mail]>
Signed-off-by: Sekhar Nori <[e-mail]>

arch/arm/boot/dts/da850-lego-ev3.dts

···
 		amp-supply = <&amp>;
 	};
 
+	cvdd: regulator0 {
+		compatible = "regulator-fixed";
+		regulator-name = "cvdd";
+		regulator-min-microvolt = <1200000>;
+		regulator-max-microvolt = <1200000>;
+		regulator-always-on;
+		regulator-boot-on;
+	};
+
 	/*
 	 * This is a 5V current limiting regulator that is shared by USB,
 	 * the sensor (input) ports, the motor (output) ports and the A/DC.
···
 
 &ref_clk {
 	clock-frequency = <24000000>;
+};
+
+&cpu {
+	cpu-supply = <&cvdd>;
+};
+
+/* since we have a fixed regulator, we can't run at these points */
+&opp_100 {
+	status = "disabled";
+};
+
+&opp_200 {
+	status = "disabled";
+};
+
+/*
+ * The SoC is actually the 456MHz version, but because of the fixed regulator
+ * This is the fastest we can go.
+ */
+&opp_375 {
+	status = "okay";
 };
 
 &pmx_core {