linux-kernel - [PATCH 3/3] arm64: dts: apple: t8103: Add ps_pmp dependency to ps

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Message-Id: <20260108-apple-dt-pmgr-fixes-v1-3-cfdce629c0a8@jannau.net>
Date: Thu, 08 Jan 2026 22:04:03 +0100
From: Janne Grunau <j@...nau.net>
To: Sven Peter <sven@...nel.org>, Neal Gompa <neal@...pa.dev>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Janne Grunau <j@...nau.net>
Subject: [PATCH 3/3] arm64: dts: apple: t8103: Add ps_pmp dependency to
 ps_gfx

AGX appears to have a hidden communication channel to pmp, a power
management related co-processor already brought up by Apple's
bootloader. As there is not driver for this co-processor its
power-domain gets shut down after the initial boot.
This crashes the firmware running on AGX immediately.
Until there is a pmp driver and the dependency between AGX and pmp is
understood keep "ps_pmp" as dependency of "ps_gfx".

Signed-off-by: Janne Grunau <j@...nau.net>
---
 arch/arm64/boot/dts/apple/t8103-pmgr.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/apple/t8103-pmgr.dtsi b/arch/arm64/boot/dts/apple/t8103-pmgr.dtsi
index 4bfe0d2de30ad6f975b31d443b62ef0e74b14324..fef8a4058f14159d953fdc1d47ed83950e30a37e 100644
--- a/arch/arm64/boot/dts/apple/t8103-pmgr.dtsi
+++ b/arch/arm64/boot/dts/apple/t8103-pmgr.dtsi
@@ -733,6 +733,7 @@ ps_gfx: power-controller@3f8 {
 		#power-domain-cells = <0>;
 		#reset-cells = <0>;
 		label = "gfx";
+		power-domains = <&ps_pmp>;
 	};
 
 	ps_dcs4: power-controller@320 {

-- 
2.52.0