overlays: Add overlay for Hifiberry ADC

Adds the DT overlay for the HiFiBerry ADC.

Signed-off-by: j-schambacher <[email protected]>

Author: j-schambacher

arch/arm/boot/dts/overlays/Makefile

@@ -86,6 +86,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	hd44780-i2c-lcd.dtbo \
 	hd44780-lcd.dtbo \
 	hdmi-backlight-hwhack-gpio.dtbo \
+	hifiberry-adc.dtbo \
 	hifiberry-amp.dtbo \
 	hifiberry-amp100.dtbo \
 	hifiberry-amp3.dtbo \

arch/arm/boot/dts/overlays/README

@@ -1786,6 +1786,13 @@ Params: gpio_pin                GPIO pin used (default 17)
                                 expects a high to switch it on.
 
 
+Name:   hifiberry-adc
+Info:   Configures the HifiBerry ADC audio card
+Load:   dtoverlay=hifiberry-adc,<param>=<val>
+Params: leds_off                If set to 'true' the onboard indicator LED
+                                is switched off at all times.
+
+
 Name:   hifiberry-amp
 Info:   Configures the HifiBerry Amp and Amp+ audio cards
 Load:   dtoverlay=hifiberry-amp

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

@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+// Definitions for HiFiBerry ADC, no onboard clocks
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2835";
+
+	fragment@0 {
+		target = <&i2s_clk_producer>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@1 {
+		target = <&i2c1>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			hb_adc: pcm186x@4a {
+				#sound-dai-cells = <0>;
+				compatible = "ti,pcm1863";
+				reg = <0x4a>;
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@2 {
+		target = <&sound>;
+		hifiberry_adc: __overlay__ {
+			compatible = "hifiberry,hifiberry-adc";
+			audio-codec = <&hb_adc>;
+			i2s-controller = <&i2s_clk_producer>;
+			status = "okay";
+		};
+	};
+
+	__overrides__ {
+		leds_off = <&hifiberry_adc>,"hifiberry-adc,leds_off?";
+	};
+};

sound/soc/bcm/Kconfig

@@ -45,6 +45,7 @@ config SND_BCM2708_SOC_HIFIBERRY_ADC
         select SND_RPI_HIFIBERRY_ADC
         help
          Say Y or M if you want to add support for HifiBerry ADC.
+         Use this module for HiFiBerry's ADC-only sound cards
 
 config SND_BCM2708_SOC_HIFIBERRY_DAC
         tristate "Support for HifiBerry DAC and DAC8X"