linux-kernel - [PATCH v2] arm64: dts: qcom: ipq5424: Add reserved memory for TF-A

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Message-Id: <20250812-atf-reserved-mem-v2-1-1adb94a998c1@oss.qualcomm.com>
Date: Tue, 12 Aug 2025 10:22:12 +0530
From: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vignesh Viswanathan <quic_viswanat@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
Subject: [PATCH v2] arm64: dts: qcom: ipq5424: Add reserved memory for TF-A

From: Vignesh Viswanathan <quic_viswanat@...cinc.com>

IPQ5424 supports both TZ and TF-A as secure software options and various
DDR sizes. In most cases, TF-A or TZ is loaded at the same memory
location, but in the 256MB DDR configuration TF-A is loaded at a different
region.

So, add the reserved memory node for TF-A and keep it disabled by default.
During bootup, U-Boot will detect which secure software is running and
enable or disable the node accordingly.

Signed-off-by: Vignesh Viswanathan <quic_viswanat@...cinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
---
- Rebased on next-20250812
- Picked up R-b tag
- Link to v1:
  https://lore.kernel.org/linux-arm-msm/20250624-atf-reserved-mem-v1-1-43b1940e2853@oss.qualcomm.com/
---
 arch/arm64/boot/dts/qcom/ipq5424.dtsi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/ipq5424.dtsi b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
index 2eea8a078595103ca2d3912f41e3594820b52771..e31e328bdf0e9aaaec3019e5a7bd71c7126e5fa8 100644
--- a/arch/arm64/boot/dts/qcom/ipq5424.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
@@ -163,6 +163,12 @@ smem@...00000 {
 
 			hwlocks = <&tcsr_mutex 3>;
 		};
+
+		tfa@...32000 {
+			reg = <0x0 0x8a832000 0x0 0x7d000>;
+			no-map;
+			status = "disabled";
+		};
 	};
 
 	soc@0 {

---
base-commit: 2674d1eadaa2fd3a918dfcdb6d0bb49efe8a8bb9
change-id: 20250812-atf-reserved-mem-bf388e366f75

Best regards,
-- 
Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>