From 0d2a0f4f4c00c958fb6e7a2673adbe51c2a932f2 Mon Sep 17 00:00:00 2001
From: b-ak <anur.bhargav@gmail.com>
Date: Thu, 3 Jan 2019 00:29:14 +0530
Subject: [PATCH] BCM270X: Adding device tree support for AudioSense-Pi
 add-on soundcard

Device tree overlay for AudioSense-Pi card.

To enable support for the hardware add the following
line to the RPi /boot/config.txt:

	dtoverlay=audiosense-pi

More documentation @ arch/arm/boot/dts/overlays/README

Signed-off-by: b-ak <anur.bhargav@gmail.com>
---
 arch/arm/boot/dts/overlays/Makefile           |  1 +
 arch/arm/boot/dts/overlays/README             |  8 ++
 .../dts/overlays/audiosense-pi-overlay.dts    | 82 +++++++++++++++++++
 3 files changed, 91 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/audiosense-pi-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -20,6 +20,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	audioinjector-addons.dtbo \
 	audioinjector-ultra.dtbo \
 	audioinjector-wm8731-audio.dtbo \
+	audiosense-pi.dtbo \
 	audremap.dtbo \
 	balena-fin.dtbo \
 	bmp085_i2c-sensor.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -453,6 +453,14 @@ Load:   dtoverlay=audioinjector-wm8731-a
 Params: <None>
 
 
+Name:   audiosense-pi
+Info:   Configures the audiosense-pi add on soundcard
+        For more information refer to
+        https://gitlab.com/kakar0t/audiosense-pi
+Load:   dtoverlay=audiosense-pi
+Params: <None>
+
+
 Name:   audremap
 Info:   Switches PWM sound output to pins 12 (Right) & 13 (Left)
 Load:   dtoverlay=audremap,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/audiosense-pi-overlay.dts
@@ -0,0 +1,82 @@
+// Definitions for audiosense add on soundcard
+/dts-v1/;
+/plugin/;
+#include <dt-bindings/pinctrl/bcm2835.h>
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	compatible = "brcm,bcm2837", "brcm,bcm2836", "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
+
+	fragment@0 {
+		target = <&i2s>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@1 {
+		target-path = "/";
+		__overlay__ {
+			codec_reg_1v8: codec-reg-1v8 {
+				compatible = "regulator-fixed";
+				regulator-name = "tlv320aic3204_1v8";
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+				regulator-always-on;
+			};
+		};
+	};
+
+	fragment@2 {
+		target = <&gpio>;
+		__overlay__ {
+			codec_rst: codec-rst {
+				brcm,pins = <26>;
+				brcm,function = <BCM2835_FSEL_GPIO_OUT>;
+			};
+		};
+	};
+
+	fragment@3 {
+		target = <&i2c1>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			/* audio external oscillator */
+			codec_osc: codec_osc {
+				compatible = "fixed-clock";
+				#clock-cells = <0>;
+				clock-frequency = <12000000>;	/* 12 MHz */
+			};
+
+			codec: tlv320aic32x4@18 {
+				#sound-dai-cells = <0>;
+				compatible = "ti,tlv320aic32x4";
+				reg = <0x18>;
+
+				clocks = <&codec_osc>;
+				clock-names = "mclk";
+
+				iov-supply = <&vdd_3v3_reg>;
+				ldoin-supply = <&vdd_3v3_reg>;
+
+				gpio-controller;
+				#gpio-cells = <2>;
+				reset-gpios = <&gpio 26 GPIO_ACTIVE_HIGH>;
+
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@4 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "as,audiosense-pi";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
+};