linux-kernel - [PATCH v10 15/15] arm64: dts: qcom: sa8775p: add a dedicated memory carveout for TZ

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Message-Id: <20240527-shm-bridge-v10-15-ce7afaa58d3a@linaro.org>
Date: Mon, 27 May 2024 14:55:05 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Robert Marko <robimarko@...il.com>, 
 Das Srinagesh <quic_gurus@...cinc.com>, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
 Maximilian Luz <luzmaximilian@...il.com>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Srini Kandagatla <srinivas.kandagatla@...aro.org>, 
 Arnd Bergmann <arnd@...db.de>, Elliot Berman <quic_eberman@...cinc.com>, 
 Alex Elder <elder@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 kernel@...cinc.com
Subject: [PATCH v10 15/15] arm64: dts: qcom: sa8775p: add a dedicated
 memory carveout for TZ

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Add a 20MB reserved memory region for use by SCM calls.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 arch/arm64/boot/dts/qcom/sa8775p.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sa8775p.dtsi b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
index 31de73594839..c183527452d7 100644
--- a/arch/arm64/boot/dts/qcom/sa8775p.dtsi
+++ b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
@@ -208,6 +208,7 @@ core3 {
 	firmware {
 		scm {
 			compatible = "qcom,scm-sa8775p", "qcom,scm";
+			memory-region = <&tz_ffi_mem>;
 		};
 	};
 
@@ -418,6 +419,12 @@ cdt_data_backup_mem: cdt-data-backup@...a0000 {
 			no-map;
 		};
 
+		tz_ffi_mem: tz-ffi@...00000 {
+			compatible = "shared-dma-pool";
+			reg = <0x0 0x91c00000 0x0 0x1400000>;
+			no-map;
+		};
+
 		lpass_machine_learning_mem: lpass-machine-learning@...00000 {
 			reg = <0x0 0x93b00000 0x0 0xf00000>;
 			no-map;

-- 
2.43.0