From e56470876bda3751a1926aa5876495e3678e363f Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Fri, 16 Apr 2021 09:31:17 +0100
Subject: [PATCH] overlays: ghost-amp: Add DAC mute control

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
 .../boot/dts/overlays/ghost-amp-overlay.dts   | 28 +++++++++++--------
 1 file changed, 17 insertions(+), 11 deletions(-)

--- a/arch/arm/boot/dts/overlays/ghost-amp-overlay.dts
+++ b/arch/arm/boot/dts/overlays/ghost-amp-overlay.dts
@@ -4,10 +4,11 @@
 
 #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
+#define ENABLE   GF_SW(0)
+#define FAULT    GF_IP(0) // GPIO5
+#define RELAY1   GF_OP(0) // GPIO22
+#define RELAY2   GF_OP(1) // GPIO23
+#define RELAYSSR GF_OP(2) // GPIO24
 
 / {
 	compatible = "brcm,bcm2835";
@@ -64,14 +65,16 @@
 				gpio-line-names = "enable";
 				input-gpios  = <&gpio 5 1>;  // FAULT (active low)
 				output-gpios = <&gpio 22 0>, // RELAY1
-					       <&gpio 23 0>; // RELAY2
+					       <&gpio 23 0>, // RELAY2
+					       <&gpio 24 0>; // RELAYSSR
 				shutdown-timeout-ms = <1000>;
 
 				amp_off {
 					start_state;
 					shutdown_state;
 
-					set = <RELAY2 0>,
+					set = <RELAYSSR 0>,
+					      <RELAY2 0>,
 					      <RELAY1 0>;
 					amp_on_1 = <ENABLE 1>;
 					fault = <FAULT 1>;
@@ -85,12 +88,14 @@
 				};
 
 				amp_on {
-					set = <RELAY2 1>;
+					set = <RELAY2 1>,
+					      <RELAYSSR 1>;
 					amp_on_wait = <ENABLE 0>;
 					fault = <FAULT 1>;
 				};
 
 				amp_on_wait {
+					set = <RELAYSSR 0>;
 					amp_off_1 = <GF_DELAY (30*60*1000)>,
 						    <GF_SHUTDOWN 0>;
 					amp_on = <ENABLE 1>;
@@ -107,7 +112,8 @@
 				// Keep this a distinct state to prevent
 				// changes and for the diagnostic output
 				fault {
-					set = <RELAY2 0>,
+					set = <RELAYSSR 0>,
+					      <RELAY2 0>,
 					      <RELAY1 0>;
 					amp_off = <FAULT 0>;
 					shutdown_state;
@@ -120,9 +126,9 @@
 		target = <&gpio>;
 		__overlay__ {
 			ghost_amp_pins: ghost_amp_pins {
-				brcm,pins = <5 22 23>;
-				brcm,function = <0 1 1>; /* in out out */
-				brcm,pull = <2 0 0>; /* up none none */
+				brcm,pins = <5 22 23 24>;
+				brcm,function = <0 1 1 1>; /* in out out out */
+				brcm,pull = <2 0 0 0>; /* up none none none */
 			};
 		};
 	};