From bbced22ee3d4c08612bbc35c860d2274e85d5a51 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Thu, 27 Aug 2020 18:57:26 +0100
Subject: [PATCH] overlays: Add option for composite to
 vc4-kms-v3d-pi4.

Composite is an alternative to HDMI/DPI/DSI on Pi4 as it
requires very particular clock setups.
Add an option to vc4-kms-v3d-pi4 to enable composite and
disable all other graphics outputs.

NB This must be used in conjunction with enable_tvout=1

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 arch/arm/boot/dts/overlays/README             |  2 ++
 .../dts/overlays/vc4-kms-v3d-pi4-overlay.dts  | 26 +++++++++++++++++++
 2 files changed, 28 insertions(+)

--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -2924,6 +2924,8 @@ Params: cma-256                 CMA is 2
         audio1                  Enable or disable audio over HDMI1 (default
                                 "on")
         noaudio                 Disable all HDMI audio (default "off")
+        composite               Enable the composite output (disables all other
+                                outputs)
 
 
 Name:   vga666
--- a/arch/arm/boot/dts/overlays/vc4-kms-v3d-pi4-overlay.dts
+++ b/arch/arm/boot/dts/overlays/vc4-kms-v3d-pi4-overlay.dts
@@ -152,9 +152,35 @@
 		};
 	};
 
+	fragment@21 {
+		target = <&pixelvalve3>;
+		__dormant__  {
+			status = "okay";
+		};
+	};
+
+	fragment@22 {
+		target = <&vec>;
+		__dormant__  {
+			status = "okay";
+		};
+	};
+
 	__overrides__ {
 		audio   = <0>,"!17";
 		audio1   = <0>,"!18";
 		noaudio = <0>,"=17", <0>,"=18", <0>,"!19";
+		composite = <0>, "!1",
+			    <0>, "!2",
+			    <0>, "!3",
+			    <0>, "!4",
+			    <0>, "!6",
+			    <0>, "!7",
+			    <0>, "!8",
+			    <0>, "!9",
+			    <0>, "!10",
+			    <0>, "!16",
+			    <0>, "=21",
+			    <0>, "=22";
 	};
 };