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From 00fa941a2c5be22d7ab5034458b1275d108c18bb Mon Sep 17 00:00:00 2001
From: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
Date: Thu, 14 Apr 2016 01:00:58 +0100
Subject: [PATCH] Add support for the Digital Dreamtime Akkordion music player.
Support the Digital Dreamtime Akkordion using the OEM IQAudIO DAC+ or
DACZero modules. Set ALSA card name, ("Akkordion"), from dt config.
Signed-off-by: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 20 ++++++++++
.../dts/overlays/akkordion-iqdacplus-overlay.dts | 46 ++++++++++++++++++++++
3 files changed, 67 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/akkordion-iqdacplus-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -13,6 +13,7 @@ ifeq ($(CONFIG_ARCH_BCM2835),y)
endif
dtbo-$(RPI_DT_OVERLAYS) += ads7846.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += akkordion-iqdacplus.dtbo
dtbo-$(RPI_DT_OVERLAYS) += at86rf233.dtbo
dtbo-$(RPI_DT_OVERLAYS) += bmp085_i2c-sensor.dtbo
dtbo-$(RPI_DT_OVERLAYS) += dpi24.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -186,6 +186,26 @@ Params: cs SPI bus
www.kernel.org/doc/Documentation/devicetree/bindings/input/ads7846.txt
+Name: akkordion-iqdacplus
+Info: Configures the Digital Dreamtime Akkordion Music Player (based on the
+ OEM IQAudIO DAC+ or DAC Zero module).
+Load: dtoverlay=akkordion-iqdacplus,<param>=<val>
+Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
+ Digital volume control. Enable with
+ dtoverlay=akkordion-iqdacplus,24db_digital_gain
+ (The default behaviour is that the Digital
+ volume control is limited to a maximum of
+ 0dB. ie. it can attenuate but not provide
+ gain. For most users, this will be desired
+ as it will prevent clipping. By appending
+ the 24db_digital_gain parameter, the Digital
+ volume control will allow up to 24dB of
+ gain. If this parameter is enabled, it is the
+ responsibility of the user to ensure that
+ the Digital volume control is set to a value
+ that does not result in clipping/distortion!)
+
+
Name: at86rf233
Info: Configures the Atmel AT86RF233 802.15.4 low-power WPAN transceiver,
connected to spi0.0
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/akkordion-iqdacplus-overlay.dts
@@ -0,0 +1,46 @@
+// Definitions for Digital Dreamtime Akkordion using IQaudIO DAC+ or DACZero
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2708";
+
+ fragment@0 {
+ target = <&sound>;
+ frag0: __overlay__ {
+ compatible = "iqaudio,iqaudio-dac";
+ card_name = "Akkordion";
+ dai_name = "IQaudIO DAC";
+ dai_stream_name = "IQaudIO DAC HiFi";
+ i2s-controller = <&i2s>;
+ status = "okay";
+ };
+ };
+
+ fragment@1 {
+ target = <&i2s>;
+ __overlay__ {
+ status = "okay";
+ };
+ };
+
+ fragment@2 {
+ target = <&i2c1>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "okay";
+
+ pcm5122@4c {
+ #sound-dai-cells = <0>;
+ compatible = "ti,pcm5122";
+ reg = <0x4c>;
+ status = "okay";
+ };
+ };
+ };
+
+ __overrides__ {
+ 24db_digital_gain = <&frag0>,"iqaudio,24db_digital_gain?";
+ };
+};
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