arm64: dts: juno: Move fixed devices out of bus node

The devicetree compiler complains when DT nodes without a reg property
live inside a (simple) bus node:
Warning (simple_bus_reg): Node /bus@8000000/v2m_refclk32khz
                          missing or empty reg/ranges property

Move the fixed clocks, the fixed regulator, and the gpio keys to the
root node, since they do not depend on any busses.

Link: https://lore.kernel.org/r/20200513103016.130417-7-andre.przywara@arm.com
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

arch/arm64/boot/dts/arm/juno-motherboard.dtsi

@@ -8,35 +8,90 @@
  */
 
 / {
-	bus@8000000 {
-		mb_clk24mhz: clk24mhz {
-			compatible = "fixed-clock";
-			#clock-cells = <0>;
-			clock-frequency = <24000000>;
-			clock-output-names = "juno_mb:clk24mhz";
-		};
+	mb_clk24mhz: clk24mhz {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <24000000>;
+		clock-output-names = "juno_mb:clk24mhz";
+	};
 
-		mb_clk25mhz: clk25mhz {
-			compatible = "fixed-clock";
-			#clock-cells = <0>;
-			clock-frequency = <25000000>;
-			clock-output-names = "juno_mb:clk25mhz";
-		};
+	mb_clk25mhz: clk25mhz {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <25000000>;
+		clock-output-names = "juno_mb:clk25mhz";
+	};
 
-		v2m_refclk1mhz: refclk1mhz {
-			compatible = "fixed-clock";
-			#clock-cells = <0>;
-			clock-frequency = <1000000>;
-			clock-output-names = "juno_mb:refclk1mhz";
-		};
+	v2m_refclk1mhz: refclk1mhz {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <1000000>;
+		clock-output-names = "juno_mb:refclk1mhz";
+	};
 
-		v2m_refclk32khz: refclk32khz {
-			compatible = "fixed-clock";
-			#clock-cells = <0>;
-			clock-frequency = <32768>;
-			clock-output-names = "juno_mb:refclk32khz";
+	v2m_refclk32khz: refclk32khz {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <32768>;
+		clock-output-names = "juno_mb:refclk32khz";
+	};
+
+	mb_fixed_3v3: mcc-sb-3v3 {
+		compatible = "regulator-fixed";
+		regulator-name = "MCC_SB_3V3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		power-button {
+			debounce-interval = <50>;
+			wakeup-source;
+			linux,code = <116>;
+			label = "POWER";
+			gpios = <&iofpga_gpio0 0 0x4>;
+		};
+		home-button {
+			debounce-interval = <50>;
+			wakeup-source;
+			linux,code = <102>;
+			label = "HOME";
+			gpios = <&iofpga_gpio0 1 0x4>;
+		};
+		rlock-button {
+			debounce-interval = <50>;
+			wakeup-source;
+			linux,code = <152>;
+			label = "RLOCK";
+			gpios = <&iofpga_gpio0 2 0x4>;
+		};
+		vol-up-button {
+			debounce-interval = <50>;
+			wakeup-source;
+			linux,code = <115>;
+			label = "VOL+";
+			gpios = <&iofpga_gpio0 3 0x4>;
 		};
+		vol-down-button {
+			debounce-interval = <50>;
+			wakeup-source;
+			linux,code = <114>;
+			label = "VOL-";
+			gpios = <&iofpga_gpio0 4 0x4>;
+		};
+		nmi-button {
+			debounce-interval = <50>;
+			wakeup-source;
+			linux,code = <99>;
+			label = "NMI";
+			gpios = <&iofpga_gpio0 5 0x4>;
+		};
+	};
 
+	bus@8000000 {
 		motherboard {
 			compatible = "arm,vexpress,v2p-p1", "simple-bus";
 			#address-cells = <2>;  /* SMB chipselect number and offset */
@@ -48,61 +103,6 @@
 			arm,vexpress,site = <0>;
 			arm,v2m-memory-map = "rs1";
 
-			mb_fixed_3v3: mcc-sb-3v3 {
-				compatible = "regulator-fixed";
-				regulator-name = "MCC_SB_3V3";
-				regulator-min-microvolt = <3300000>;
-				regulator-max-microvolt = <3300000>;
-				regulator-always-on;
-			};
-
-			gpio-keys {
-				compatible = "gpio-keys";
-
-				power-button {
-					debounce-interval = <50>;
-					wakeup-source;
-					linux,code = <116>;
-					label = "POWER";
-					gpios = <&iofpga_gpio0 0 0x4>;
-				};
-				home-button {
-					debounce-interval = <50>;
-					wakeup-source;
-					linux,code = <102>;
-					label = "HOME";
-					gpios = <&iofpga_gpio0 1 0x4>;
-				};
-				rlock-button {
-					debounce-interval = <50>;
-					wakeup-source;
-					linux,code = <152>;
-					label = "RLOCK";
-					gpios = <&iofpga_gpio0 2 0x4>;
-				};
-				vol-up-button {
-					debounce-interval = <50>;
-					wakeup-source;
-					linux,code = <115>;
-					label = "VOL+";
-					gpios = <&iofpga_gpio0 3 0x4>;
-				};
-				vol-down-button {
-					debounce-interval = <50>;
-					wakeup-source;
-					linux,code = <114>;
-					label = "VOL-";
-					gpios = <&iofpga_gpio0 4 0x4>;
-				};
-				nmi-button {
-					debounce-interval = <50>;
-					wakeup-source;
-					linux,code = <99>;
-					label = "NMI";
-					gpios = <&iofpga_gpio0 5 0x4>;
-				};
-			};
-
 			flash@0 {
 				/* 2 * 32MiB NOR Flash memory mounted on CS0 */
 				compatible = "arm,vexpress-flash", "cfi-flash";