Support for Blokas Labs pisound board

Pisound dynamic overlay (#1760)

Restructuring pisound-overlay.dts, so it can be loaded and unloaded dynamically using dtoverlay.

Print a logline when the kernel module is removed.

Author: gtrainavicius

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -43,6 +43,7 @@ avago	Avago Technologies
 avic	Shanghai AVIC Optoelectronics Co., Ltd.
 axentia	Axentia Technologies AB
 axis	Axis Communications AB
+blokaslabs	Vilniaus Blokas UAB
 boe	BOE Technology Group Co., Ltd.
 bosch	Bosch Sensortec GmbH
 boundary	Boundary Devices Inc.

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

@@ -26,6 +26,54 @@
 	compatible = "brcm,bcm2708";
 
 	fragment@0 {
+		target = <&spi0>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@1 {
+		target = <&spidev0>;
+		__overlay__ {
+			status = "disabled";
+		};
+	};
+
+	fragment@2 {
+		target = <&spidev1>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@3 {
+		target = <&spi0>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			pisound_spi: pisound_spi@0{
+				compatible = "blokaslabs,pisound-spi";
+				reg = <0>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&spi0_pins>;
+				spi-max-frequency = <1000000>;
+			};
+		};
+	};
+
+	fragment@4 {
+		target-path = "/";
+		__overlay__ {
+			pcm5102a-codec {
+				#sound-dai-cells = <0>;
+				compatible = "ti,pcm5102a";
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@5 {
 		target = <&sound>;
 		__overlay__ {
 			compatible = "blokaslabs,pisound";
@@ -49,7 +97,7 @@
 		};
 	};
 
-	fragment@1 {
+	fragment@6 {
 		target = <&gpio>;
 		__overlay__ {
 			pinctrl-names = "default";
@@ -63,52 +111,10 @@
 		};
 	};
 
-	fragment@2 {
+	fragment@7 {
 		target = <&i2s>;
 		__overlay__ {
 			status = "okay";
 		};
 	};
-
-	fragment@3 {
-		target-path = "/";
-		__overlay__ {
-			pcm5102a-codec {
-				#sound-dai-cells = <0>;
-				compatible = "ti,pcm5102a";
-				status = "okay";
-			};
-		};
-	};
-
-	fragment@4 {
-		target = <&spi0>;
-		__overlay__ {
-			status = "okay";
-
-			spidev@0{
-				status = "disabled";
-			};
-
-			spidev@1{
-				status = "okay";
-			};
-		};
-	};
-
-	fragment@5 {
-		target = <&spi0>;
-		__overlay__ {
-			#address-cells = <1>;
-			#size-cells = <0>;
-
-			pisound_spi: pisound_spi@0{
-				compatible = "blokaslabs,pisound-spi";
-				reg = <0>;
-				pinctrl-names = "default";
-				pinctrl-0 = <&spi0_pins>;
-				spi-max-frequency = <1000000>;
-			};
-		};
-	};
 };

sound/soc/bcm/Kconfig

@@ -131,3 +131,9 @@ config SND_BCM2708_SOC_ALLO_PIANO_DAC
 	select SND_SOC_PCM512x_I2C
 	help
 	  Say Y or M if you want to add support for Allo Piano DAC.
+
+config SND_PISOUND
+	tristate "Support for Blokas Labs pisound"
+	depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+	help
+	  Say Y or M if you want to add support for Blokas Labs pisound.

sound/soc/bcm/Makefile

@@ -25,6 +25,7 @@ snd-soc-audioinjector-pi-soundcard-objs := audioinjector-pi-soundcard.o
 snd-soc-digidac1-soundcard-objs := digidac1-soundcard.o
 snd-soc-dionaudio-loco-objs := dionaudio_loco.o
 snd-soc-allo-piano-dac-objs := allo-piano-dac.o
+snd-soc-pisound-objs := pisound.o
 
 obj-$(CONFIG_SND_BCM2708_SOC_ADAU1977_ADC) += snd-soc-adau1977-adc.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
@@ -42,3 +43,4 @@ obj-$(CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD) += snd-soc-audioinjector-pi-soundca
 obj-$(CONFIG_SND_DIGIDAC1_SOUNDCARD) += snd-soc-digidac1-soundcard.o
 obj-$(CONFIG_SND_BCM2708_SOC_DIONAUDIO_LOCO) += snd-soc-dionaudio-loco.o
 obj-$(CONFIG_SND_BCM2708_SOC_ALLO_PIANO_DAC) += snd-soc-allo-piano-dac.o
+obj-$(CONFIG_SND_PISOUND) += snd-soc-pisound.o