linux-kernel - [PATCH 03/15] arm64: dts: mediatek: mt7981b: Add reserved memory for TF-A

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Message-Id: <20251016-openwrt-one-network-v1-3-de259719b6f2@collabora.com>
Date: Thu, 16 Oct 2025 12:08:39 +0200
From: Sjoerd Simons <sjoerd@...labora.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Ryder Lee <ryder.lee@...iatek.com>, 
 Jianjun Wang <jianjun.wang@...iatek.com>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kwilczynski@...nel.org>, 
 Manivannan Sadhasivam <mani@...nel.org>, 
 Chunfeng Yun <chunfeng.yun@...iatek.com>, Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Lee Jones <lee@...nel.org>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Lorenzo Bianconi <lorenzo@...nel.org>, Felix Fietkau <nbd@....name>
Cc: kernel@...labora.com, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, linux-pci@...r.kernel.org, 
 linux-phy@...ts.infradead.org, netdev@...r.kernel.org, 
 Daniel Golle <daniel@...rotopia.org>, Bryan Hinton <bryan@...anhinton.com>, 
 Sjoerd Simons <sjoerd@...labora.com>
Subject: [PATCH 03/15] arm64: dts: mediatek: mt7981b: Add reserved memory
 for TF-A

Add memory range handled by ARM Trusted Firmware

Signed-off-by: Sjoerd Simons <sjoerd@...labora.com>
---
 arch/arm64/boot/dts/mediatek/mt7981b.dtsi | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
index 6b024156fa7c5..b477375078ccd 100644
--- a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
@@ -41,6 +41,18 @@ psci {
 		method = "smc";
 	};

+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		/* 192 KiB reserved for ARM Trusted Firmware (BL31) */
+		secmon_reserved: secmon@...00000 {
+			reg = <0 0x43000000 0 0x30000>;
+			no-map;
+		};
+	};
+
 	soc {
 		compatible = "simple-bus";
 		ranges;

-- 
2.51.0