BCM270X_DT: Sound DT adjustments for Dynamic DT

There are a number of issues when loading and unloading overlays for
sound cards:
1) The "sound" and "audio" nodes must be children of a bus node, such
   as "/soc", otherwise the DT changes don't result in platform devices
   being created and deleted.
2) The "/sound" node must have a "disabled" status property, otherwise
   setting the status to "okay" won't be detected.
3) ALSA doesn't like having components unloaded under its feet, and it
   is easy to deadlock or crash. Ordering the overlay fragments so that
   the sound card appears last avoids this problem.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>

arch/arm/boot/dts/bcm2708_common.dtsi

@@ -34,17 +34,6 @@
 		clocks = &clocks;
 	};
 
-	/* Onboard audio */
-	audio: audio {
-		compatible = "brcm,bcm2835-audio";
-		brcm,pwm-channels = <8>;
-		status = "disabled";
-	};
-
-	/* External sound card */
-	sound: sound {
-	};
-
 	soc: soc {
 		compatible = "simple-bus";
 		#address-cells = <1>;
@@ -313,6 +302,18 @@
 			compatible = "brcm,bcm2835-thermal";
 			firmware = <&firmware>;
 		};
+
+		/* Onboard audio */
+		audio: audio {
+			compatible = "brcm,bcm2835-audio";
+			brcm,pwm-channels = <8>;
+			status = "disabled";
+		};
+
+		/* External sound card */
+		sound: sound {
+			status = "disabled";
+		};
 	};
 
 	clocks: clocks {

arch/arm/boot/dts/overlays/akkordion-iqdacplus-overlay.dts

@@ -6,25 +6,13 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
-		target = <&sound>;
-		frag0: __overlay__ {
-			compatible = "iqaudio,iqaudio-dac";
-			card_name = "Akkordion";
-			dai_name = "IQaudIO DAC";
-			dai_stream_name = "IQaudIO DAC HiFi";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@1 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@2 {
+	fragment@1 {
 		target = <&i2c1>;
 		__overlay__ {
 			#address-cells = <1>;
@@ -40,7 +28,19 @@
 		};
 	};
 
+	fragment@2 {
+		target = <&sound>;
+		frag2: __overlay__ {
+			compatible = "iqaudio,iqaudio-dac";
+			card_name = "Akkordion";
+			dai_name = "IQaudIO DAC";
+			dai_stream_name = "IQaudIO DAC HiFi";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
+
 	__overrides__ {
-		24db_digital_gain = <&frag0>,"iqaudio,24db_digital_gain?";
+		24db_digital_gain = <&frag2>,"iqaudio,24db_digital_gain?";
 	};
 };

arch/arm/boot/dts/overlays/boomberry-dac-overlay.dts

@@ -6,22 +6,13 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
-		target = <&sound>;
-		frag0: __overlay__ {
-			compatible = "boomberry,boomberry-dac";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@1 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@2 {
+	fragment@1 {
 		target = <&i2c1>;
 		__overlay__ {
 			#address-cells = <1>;
@@ -37,7 +28,16 @@
 		};
 	};
 
+	fragment@2 {
+		target = <&sound>;
+		frag2: __overlay__ {
+			compatible = "boomberry,boomberry-dac";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
+
 	__overrides__ {
-		24db_digital_gain = <&frag0>,"boomberry,24db_digital_gain?";
+		24db_digital_gain = <&frag2>,"boomberry,24db_digital_gain?";
 	};
 };

arch/arm/boot/dts/overlays/boomberry-digi-overlay.dts

@@ -6,22 +6,13 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
-		target = <&sound>;
-		__overlay__ {
-			compatible = "boomberry,boomberry-digi";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@1 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@2 {
+	fragment@1 {
 		target = <&i2c1>;
 		__overlay__ {
 			#address-cells = <1>;
@@ -36,4 +27,13 @@
 			};
 		};
 	};
+
+	fragment@2 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "boomberry,boomberry-digi";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
 };

arch/arm/boot/dts/overlays/hifiberry-amp-overlay.dts

@@ -6,22 +6,13 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
-		target = <&sound>;
-		__overlay__ {
-			compatible = "hifiberry,hifiberry-amp";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@1 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@2 {
+	fragment@1 {
 		target = <&i2c1>;
 		__overlay__ {
 			#address-cells = <1>;
@@ -36,4 +27,13 @@
 			};
 		};
 	};
+
+	fragment@2 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "hifiberry,hifiberry-amp";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
 };

arch/arm/boot/dts/overlays/hifiberry-dac-overlay.dts

@@ -6,23 +6,14 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
-		target = <&sound>;
-		__overlay__ {
-			compatible = "hifiberry,hifiberry-dac";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@1 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@2 {
-		target-path = "/";
+	fragment@1 {
+		target = <&soc>;
 		__overlay__ {
 			pcm5102a-codec {
 				#sound-dai-cells = <0>;
@@ -31,4 +22,13 @@
 			};
 		};
 	};
+
+	fragment@2 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "hifiberry,hifiberry-dac";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
 };

arch/arm/boot/dts/overlays/hifiberry-dacplus-overlay.dts

@@ -16,22 +16,13 @@
 	};
 
 	fragment@1 {
-		target = <&sound>;
-		frag1: __overlay__ {
-			compatible = "hifiberry,hifiberry-dacplus";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@2 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@3 {
+	fragment@2 {
 		target = <&i2c1>;
 		__overlay__ {
 			#address-cells = <1>;
@@ -48,7 +39,16 @@
 		};
 	};
 
+	fragment@3 {
+		target = <&sound>;
+		frag3: __overlay__ {
+			compatible = "hifiberry,hifiberry-dacplus";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
+
 	__overrides__ {
-		24db_digital_gain = <&frag1>,"hifiberry,24db_digital_gain?";
+		24db_digital_gain = <&frag3>,"hifiberry,24db_digital_gain?";
 	};
 };

arch/arm/boot/dts/overlays/hifiberry-digi-overlay.dts

@@ -6,22 +6,13 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
-		target = <&sound>;
-		__overlay__ {
-			compatible = "hifiberry,hifiberry-digi";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@1 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@2 {
+	fragment@1 {
 		target = <&i2c1>;
 		__overlay__ {
 			#address-cells = <1>;
@@ -36,4 +27,13 @@
 			};
 		};
 	};
+
+	fragment@2 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "hifiberry,hifiberry-digi";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
 };

arch/arm/boot/dts/overlays/iqaudio-dac-overlay.dts

@@ -6,22 +6,13 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
-		target = <&sound>;
-		__overlay__ {
-			compatible = "iqaudio,iqaudio-dac";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@1 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@2 {
+	fragment@1 {
 		target = <&i2c1>;
 		__overlay__ {
 			#address-cells = <1>;
@@ -36,4 +27,13 @@
 			};
 		};
 	};
+
+	fragment@2 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "iqaudio,iqaudio-dac";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
 };

arch/arm/boot/dts/overlays/iqaudio-dacplus-overlay.dts

@@ -6,22 +6,13 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
-		target = <&sound>;
-		frag0: __overlay__ {
-			compatible = "iqaudio,iqaudio-dac";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@1 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@2 {
+	fragment@1 {
 		target = <&i2c1>;
 		__overlay__ {
 			#address-cells = <1>;
@@ -37,7 +28,16 @@
 		};
 	};
 
+	fragment@2 {
+		target = <&sound>;
+		frag2: __overlay__ {
+			compatible = "iqaudio,iqaudio-dac";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
+
 	__overrides__ {
-		24db_digital_gain = <&frag0>,"iqaudio,24db_digital_gain?";
+		24db_digital_gain = <&frag2>,"iqaudio,24db_digital_gain?";
 	};
 };

arch/arm/boot/dts/overlays/raspidac3-overlay.dts

@@ -6,22 +6,13 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
-		target = <&sound>;
-		__overlay__ {
-			compatible = "jg,raspidacv3";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@1 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@2 {
+	fragment@1 {
 		target = <&i2c1>;
 		__overlay__ {
 			#address-cells = <1>;
@@ -42,4 +33,13 @@
 			};
 		};
 	};
+
+	fragment@2 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "jg,raspidacv3";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
 };

arch/arm/boot/dts/overlays/rpi-dac-overlay.dts

@@ -6,23 +6,14 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
-		target = <&sound>;
-		__overlay__ {
-			compatible = "rpi,rpi-dac";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@1 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@2 {
-		target-path = "/";
+	fragment@1 {
+		target = <&soc>;
 		__overlay__ {
 			pcm1794a-codec {
 				#sound-dai-cells = <0>;
@@ -31,4 +22,13 @@
 			};
 		};
 	};
+
+	fragment@2 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "rpi,rpi-dac";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
 };

arch/arm/boot/dts/overlays/rpi-proto-overlay.dts

@@ -6,22 +6,13 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
-		target = <&sound>;
-		__overlay__ {
-			compatible = "rpi,rpi-proto";
-			i2s-controller = <&i2s>;
-			status = "okay";
-		};
-	};
-
-	fragment@1 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
 
-	fragment@2 {
+	fragment@1 {
 		target = <&i2c1>;
 		__overlay__ {
 			#address-cells = <1>;
@@ -36,4 +27,13 @@
 			};
 		};
 	};
+
+	fragment@2 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "rpi,rpi-proto";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
 };