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From 96f25d50e2352922e16ae74bb16fd8b6985f0f66 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Wed, 30 Sep 2020 12:17:48 +0100
Subject: [PATCH] overlays: Add ghost-amp overlay
Add an overlay for the Ghost amplifier.
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 7 ++
.../boot/dts/overlays/ghost-amp-overlay.dts | 119 ++++++++++++++++++
3 files changed, 127 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/ghost-amp-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -45,6 +45,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
exc3000.dtbo \
fe-pi-audio.dtbo \
fsm-demo.dtbo \
+ ghost-amp.dtbo \
goodix.dtbo \
googlevoicehat-soundcard.dtbo \
gpio-fan.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -775,6 +775,13 @@ Load: dtoverlay=fsm-demo,<param>=<val>
Params: fsm_debug Enable debug logging (default off)
+Name: ghost-amp
+Info: An overlay for the Ghost amplifier.
+Load: dtoverlay=ghost-amp,<param>=<val>
+Params: fsm_debug Enable debug logging of the GPIO FSM (default
+ off)
+
+
Name: goodix
Info: Enables I2C connected Goodix gt9271 multiple touch controller using
GPIOs 4 and 17 (pins 7 and 11 on GPIO header) for interrupt and reset.
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/ghost-amp-overlay.dts
@@ -0,0 +1,119 @@
+// Overlay for the PCM5122-based Ghost amplifier using gpio-fsm
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio-fsm.h>
+
+#define ENABLE GF_SW(0)
+#define FAULT GF_IP(0) // GPIO5
+#define RELAY1 GF_OP(0) // GPIO22
+#define RELAY2 GF_OP(1) // GPIO23
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target = <&i2s>;
+ __overlay__ {
+ status = "okay";
+ };
+ };
+
+ fragment@1 {
+ target = <&i2c1>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "okay";
+
+ pcm5122@4c {
+ #sound-dai-cells = <0>;
+ compatible = "ti,pcm5122";
+ reg = <0x4c>;
+ AVDD-supply = <&vdd_3v3_reg>;
+ DVDD-supply = <&vdd_3v3_reg>;
+ CPVDD-supply = <&vdd_3v3_reg>;
+ status = "okay";
+ };
+ };
+ };
+
+ fragment@2 {
+ target = <&sound>;
+ iqaudio_dac: __overlay__ {
+ compatible = "iqaudio,iqaudio-dac";
+ i2s-controller = <&i2s>;
+ mute-gpios = <& 0 0>;
+ iqaudio-dac,auto-mute-amp;
+ status = "okay";
+ };
+ };
+
+ fragment@3 {
+ target-path = "/";
+ __overlay__ {
+ amp: ghost-amp {
+ compatible = "rpi,gpio-fsm";
+
+ debug = <0>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ num-soft-gpios = <1>;
+ gpio-line-names = "enable";
+ input-gpios = <&gpio 5 1>; // FAULT (active low)
+ output-gpios = <&gpio 22 0>, // RELAY1
+ <&gpio 23 0>; // RELAY2
+ shutdown-timeout-ms = <1000>;
+
+ amp_off {
+ start_state;
+ shutdown_state;
+
+ set = <RELAY2 0>,
+ <RELAY1 0>;
+ amp_on_1 = <ENABLE 1>;
+ fault = <FAULT 1>;
+ };
+
+ amp_on_1 {
+ set = <RELAY1 1>;
+ amp_on = <GF_DELAY 1500>;
+ amp_off = <ENABLE 0>;
+ fault = <FAULT 1>;
+ };
+
+ amp_on {
+ set = <RELAY2 1>;
+ amp_off_wait = <ENABLE 0>;
+ fault = <FAULT 1>;
+ };
+
+ amp_off_wait {
+ amp_off_1 = <GF_DELAY (30*60*1000)>,
+ <GF_SHUTDOWN 0>;
+ amp_on = <ENABLE 1>;
+ fault = <FAULT 1>;
+ };
+
+ amp_off_1 {
+ set = <RELAY2 0>;
+ amp_on = <ENABLE 1>;
+ amp_off = <GF_DELAY 100>;
+ fault = <FAULT 1>;
+ };
+
+ // Keep this a distinct state to prevent
+ // changes and for the diagnostic output
+ fault {
+ set = <RELAY2 0>,
+ <RELAY1 0>;
+ shutdown_state;
+ };
+ };
+ };
+ };
+
+ __overrides__ {
+ fsm_debug = <&>,"debug:0";
+ };
+};
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