From 209e8a3e6646f25abb352fd5a8a4c2e855b1e952 Mon Sep 17 00:00:00 2001
From: Adrian Figueroa <elagil@takanome.de>
Date: Wed, 14 Aug 2024 20:00:12 +0200
Subject: [PATCH 1219/1350] overlays: add overlay for generic I2S clock-master
 DAC

Adds an overlay for supporting a generic I2S DAC that
acts as the clock master on the bus.
The data format is 32 bit stereo.

Signed-off-by: Adrian Figueroa <elagil@takanome.de>
---
 arch/arm/boot/dts/overlays/Makefile           |  1 +
 arch/arm/boot/dts/overlays/README             |  6 +++
 .../dts/overlays/i2s-master-dac-overlay.dts   | 50 +++++++++++++++++++
 3 files changed, 57 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/i2s-master-dac-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -125,6 +125,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	i2c6.dtbo \
 	i2s-dac.dtbo \
 	i2s-gpio28-31.dtbo \
+	i2s-master-dac.dtbo \
 	ilitek251x.dtbo \
 	imx219.dtbo \
 	imx258.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -2633,6 +2633,12 @@ Load:   dtoverlay=i2s-gpio28-31
 Params: <None>
 
 
+Name:   i2s-master-dac
+Info:   Configures a generic I2S DAC soundcard that acts as a clock master.
+Load:   dtoverlay=i2s-master-dac
+Params: <None>
+
+
 Name:   ilitek251x
 Info:   Enables I2C connected Ilitek 251x multiple touch controller using
         GPIO 4 (pin 7 on GPIO header) for interrupt.
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/i2s-master-dac-overlay.dts
@@ -0,0 +1,50 @@
+// Definitions for a generic I2S DAC that acts as clock master on the bus.
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2835";
+
+	fragment@0 {
+		target = <&i2s_clk_consumer>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@1 {
+		target-path = "/";
+		__overlay__ {
+			codec_bare: codec_bare {
+				compatible = "linux,spdif-dit";
+				#sound-dai-cells = <0>;
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@2 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "simple-audio-card";
+			i2s-controller = <&i2s_clk_consumer>;
+			status = "okay";
+
+			simple-audio-card,name = "i2s-master-dac";
+			simple-audio-card,format = "i2s";
+
+			simple-audio-card,bitclock-master = <&snd_codec>;
+			simple-audio-card,frame-master = <&snd_codec>;
+
+			simple-audio-card,cpu {
+				sound-dai = <&i2s_clk_consumer>;
+				dai-tdm-slot-num = <2>;
+				dai-tdm-slot-width = <32>;
+			};
+
+			snd_codec: simple-audio-card,codec {
+				sound-dai = <&codec_bare>;
+			};
+		};
+	};
+};