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131 lines
4.6 KiB
Diff
131 lines
4.6 KiB
Diff
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From 607dd7d1529f719b342861f16654b36d868a5cc6 Mon Sep 17 00:00:00 2001
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From: Joerg Schambacher <joerg@hifiberry.com>
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Date: Fri, 19 Jan 2024 10:44:22 +0100
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Subject: [PATCH 0878/1085] DT-overlays: adds support for Hifiberry AMP4 Pro
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The AMP4 Pro uses a TI TAS5756 amplifier in master mode
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and requires the DAC Plus card driver and the
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pcm512x component driver with TAS support.
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Signed-off-by: Joerg Schambacher <joerg@hifiberry.com>
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 28 +++++++++
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.../overlays/hifiberry-amp4pro-overlay.dts | 63 +++++++++++++++++++
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3 files changed, 92 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/hifiberry-amp4pro-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -87,6 +87,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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hifiberry-amp.dtbo \
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hifiberry-amp100.dtbo \
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hifiberry-amp3.dtbo \
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+ hifiberry-amp4pro.dtbo \
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hifiberry-dac.dtbo \
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hifiberry-dacplus.dtbo \
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hifiberry-dacplusadc.dtbo \
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -1744,6 +1744,34 @@ Load: dtoverlay=hifiberry-amp3
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Params: <None>
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+Name: hifiberry-amp4pro
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+Info: Configures the HifiBerry AMP4 Pro audio card
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+Load: dtoverlay=hifiberry-amp4pro,<param>=<val>
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+Params: 24db_digital_gain Allow gain to be applied via the TAS5756
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+ Digital volume control. Enable with
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+ "dtoverlay=hifiberry-amp4pro,24db_digital_gain"
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+ (The default behaviour is that the Digital
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+ volume control is limited to a maximum of
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+ 0dB. ie. it can attenuate but not provide
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+ gain. For most users, this will be desired
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+ as it will prevent clipping. By appending
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+ the 24dB_digital_gain parameter, the Digital
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+ volume control will allow up to 24dB of
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+ gain. If this parameter is enabled, it is the
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+ responsibility of the user to ensure that
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+ the Digital volume control is set to a value
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+ that does not result in clipping/distortion!)
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+ slave Force the amp into slave mode, using Pi as
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+ master for bit clock and frame clock.
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+ leds_off If set to 'true' the onboard indicator LEDs
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+ are switched off at all times.
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+ auto_mute If set to 'true' the amplifier is automatically
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+ muted when it is not playing.
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+ mute_ext_ctl The amplifier's HW mute control is enabled
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+ in ALSA mixer and set to <val>.
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+ Will be overwritten by ALSA user settings.
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+
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+
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Name: hifiberry-dac
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Info: Configures the HifiBerry DAC audio cards
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Load: dtoverlay=hifiberry-dac
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/hifiberry-amp4pro-overlay.dts
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@@ -0,0 +1,63 @@
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+// Definitions for HiFiBerry AMP4PRO
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+/dts-v1/;
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+/plugin/;
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+#include <dt-bindings/gpio/gpio.h>
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+
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+/ {
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+ compatible = "brcm,bcm2835";
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+
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+ fragment@0 {
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+ target-path = "/";
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+ __overlay__ {
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+ dacpro_osc: dacpro_osc {
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+ compatible = "hifiberry,dacpro-clk";
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+ #clock-cells = <0>;
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+ };
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+ };
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+ };
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+
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+ frag1: fragment@1 {
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+ target = <&i2s_clk_consumer>;
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+ __overlay__ {
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@2 {
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+ target = <&i2c1>;
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+ __overlay__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ status = "okay";
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+
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+ tas5756@4d {
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+ #sound-dai-cells = <0>;
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+ compatible = "ti,tas5756";
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+ reg = <0x4d>;
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+ clocks = <&dacpro_osc>;
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+ status = "okay";
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+ };
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+ };
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+ };
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+
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+ fragment@3 {
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+ target = <&sound>;
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+ hifiberry_dacplus: __overlay__ {
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+ compatible = "hifiberry,hifiberry-dacplus";
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+ i2s-controller = <&i2s_clk_consumer>;
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+ status = "okay";
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+ mute-gpio = <&gpio 4 GPIO_ACTIVE_LOW>;
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+ };
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+ };
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+
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+ __overrides__ {
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+ 24db_digital_gain =
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+ <&hifiberry_dacplus>,"hifiberry-amp4,24db_digital_gain?";
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+ leds_off = <&hifiberry_dacplus>,"hifiberry-amp4,leds_off?";
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+ mute_ext_ctl = <&hifiberry_dacplus>,"hifiberry-amp4,mute_ext_ctl:0";
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+ auto_mute = <&hifiberry_dacplus>,"hifiberry-amp4,auto_mute?";
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+ slave = <&hifiberry_dacplus>,"hifiberry-dacplus,slave?",
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+ <&frag1>,"target:0=",<&i2s_clk_producer>,
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+ <&hifiberry_dacplus>,"i2s-controller:0=",<&i2s_clk_producer>;
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+ };
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+};
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