ES9023: i-sabre-dac overlay

Add i-sabre-dac overlay for Audiophonics I-Sabre DAC.

Signed-off-by: DigitalDreamtime <[email protected]>

Author: DigitalDreamtime

arch/arm/boot/dts/overlays/Makefile

@@ -34,6 +34,7 @@ dtbo-$(RPI_DT_OVERLAYS) += hifiberry-dacplus.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += hifiberry-digi.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += hy28a.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += hy28b.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += i-sabre-dac.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c-rtc.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c-gpio.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += i2c-mux-pca9548a.dtbo

arch/arm/boot/dts/overlays/README

@@ -442,6 +442,22 @@ Params: speed                   Display SPI bus speed
         ledgpio                 GPIO used to control backlight
 
 
+Name:   i-sabre-dac
+Info:   Configures the Audiophonics I-Sabre DAC
+Load:   dtoverlay=i-sabre-dac,<param>
+Params: bclk_ratio_integer_div  Use bclk_ratio=50 for 16 and 24 bps and
+                                bclk_ratio=100 for 32 bps media when sample rate
+                                is a multiple of 8000 and less than 192kHz,
+                                which allows the use of the OSC with integer
+                                divider rather than PLL with fractional (MASH)
+                                divider. Enable with
+                                "dtoverlay=akkordion-dac,bclk_ratio_integer_div"
+        max_rate                Instructs the es9023 codec driver to support
+                                352k8 and 384k sample rates, assuming the kernel
+                                has been compiled with support for these sample
+                                rates.
+
+
 Name:   i2c-gpio
 Info:   Adds support for software i2c controller on gpio pins
 Load:   dtoverlay=i2c-gpio,<param>=<val>

arch/arm/boot/dts/overlays/i-sabre-dac-overlay.dts

@@ -0,0 +1,42 @@
+// Definitions for Audiophonics I-Sabre DAC
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&i2s>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@1 {
+		target-path = "/";
+		__overlay__ {
+			es9023: es9023-codec {
+				#sound-dai-cells = <0>;
+				compatible = "ess,es9023";
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@2 {
+		target = <&sound>;
+		frag2: __overlay__ {
+			compatible = "audiphonics,i-sabre-dac";
+			card_name = "ISabre";
+			dai_name = "ISabre DAC";
+			dai_stream_name = "ISabre DAC HiFi";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
+
+	__overrides__ {
+		max_rate = <&es9023>,"es9023,max_rate?";
+		bclk_ratio_integer_div = <&frag2>,"es9023,bclk_ratio_integer_div?";
+	};
+};