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From bcaa1b9dcc731ff3d7a8d36769062e9571d0738c Mon Sep 17 00:00:00 2001
From: Joerg Schambacher <joerg@i2audio.com>
Date: Fri, 29 Jan 2021 08:26:44 +0100
Subject: [PATCH] Adds the DT-overlays to support Hifiberry AMP100
Adds new DT-overlay to control AMP100.
Signed-off-by: Joerg Schambacher <joerg@hifiberry.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 30 ++++++++-
.../dts/overlays/hifiberry-amp100-overlay.dts | 64 +++++++++++++++++++
3 files changed, 94 insertions(+), 1 deletion(-)
create mode 100644 arch/arm/boot/dts/overlays/hifiberry-amp100-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -61,6 +61,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
hd44780-lcd.dtbo \
hdmi-backlight-hwhack-gpio.dtbo \
hifiberry-amp.dtbo \
+ hifiberry-amp100.dtbo \
hifiberry-dac.dtbo \
hifiberry-dacplus.dtbo \
hifiberry-dacplusadc.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1059,8 +1059,36 @@ Load: dtoverlay=hifiberry-amp
Params: <None>
+Name: hifiberry-amp100
+Info: Configures the HifiBerry AMP100 audio card
+Load: dtoverlay=hifiberry-amp100,<param>=<val>
+Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
+ Digital volume control. Enable with
+ "dtoverlay=hifiberry-amp100,24db_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!)
+ slave Force DAC+ Pro into slave mode, using Pi as
+ master for bit clock and frame clock.
+ leds_off If set to 'true' the onboard indicator LEDs
+ are switched off at all times.
+ auto_mute If set to 'true' the amplifier is automatically
+ muted when the DAC is not playing.
+ mute_ext_ctl The amplifier's HW mute control is enabled
+ in ALSA mixer and set to <val>.
+ Will be overwritten by ALSA user settings.
+
+
Name: hifiberry-dac
-Info: Configures the HifiBerry DAC audio card
+Info: Configures the HifiBerry DAC audio cards
Load: dtoverlay=hifiberry-dac
Params: <None>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/hifiberry-amp100-overlay.dts
@@ -0,0 +1,64 @@
+// Definitions for HiFiBerry AMP100
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target-path = "/";
+ __overlay__ {
+ dacpro_osc: dacpro_osc {
+ compatible = "hifiberry,dacpro-clk";
+ #clock-cells = <0>;
+ };
+ };
+ };
+
+ fragment@1 {
+ target = <&i2s>;
+ __overlay__ {
+ status = "okay";
+ };
+ };
+
+ fragment@2 {
+ target = <&i2c1>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "okay";
+
+ pcm5122@4d {
+ #sound-dai-cells = <0>;
+ compatible = "ti,pcm5122";
+ reg = <0x4d>;
+ clocks = <&dacpro_osc>;
+ AVDD-supply = <&vdd_3v3_reg>;
+ DVDD-supply = <&vdd_3v3_reg>;
+ CPVDD-supply = <&vdd_3v3_reg>;
+ status = "okay";
+ };
+ };
+ };
+
+ fragment@3 {
+ target = <&sound>;
+ hifiberry_dacplus: __overlay__ {
+ compatible = "hifiberry,hifiberry-dacplus";
+ i2s-controller = <&i2s>;
+ status = "okay";
+ mute-gpio = <&gpio 4 0>;
+ reset-gpio = <&gpio 17 0x11>;
+ };
+ };
+
+ __overrides__ {
+ 24db_digital_gain =
+ <&hifiberry_dacplus>,"hifiberry,24db_digital_gain?";
+ slave = <&hifiberry_dacplus>,"hifiberry-dacplus,slave?";
+ leds_off = <&hifiberry_dacplus>,"hifiberry-dacplus,leds_off?";
+ mute_ext_ctl = <&hifiberry_dacplus>,"hifiberry-dacplus,mute_ext_ctl:0";
+ auto_mute = <&hifiberry_dacplus>,"hifiberry-dacplus,auto_mute?";
+ };
+};
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