linux-kernel - [PATCH PULL v6.9 3/3] ARM: dts: samsung: exynos4412: decrease memory to account for unusable region

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Message-Id: <20240227080755.34170-3-krzysztof.kozlowski@linaro.org>
Date: Tue, 27 Feb 2024 09:07:55 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Olof Johansson <olof@...om.net>,
	Arnd Bergmann <arnd@...db.de>,
	arm@...nel.org,
	soc@...nel.org
Cc: Artur Weber <aweber.kernel@...il.com>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Peter Griffin <peter.griffin@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Henrik Grimler <henrik@...mler.se>
Subject: [PATCH PULL v6.9 3/3] ARM: dts: samsung: exynos4412: decrease memory to account for unusable region

From: Artur Weber <aweber.kernel@...il.com>

The last 4 MiB of RAM on those devices is likely used by trustzone
firmware, and is unusable under Linux. Change the device tree memory
node accordingly.

The proprietary bootloader (S-BOOT) passes these memory ranges through
ATAG_MEM; this change allows us to have the correct memory ranges
without relying on ATAG_MEM.

Tested-by: Henrik Grimler <henrik@...mler.se> # i9300, i9305
Signed-off-by: Artur Weber <aweber.kernel@...il.com>
Link: https://lore.kernel.org/r/20240217-exynos4-memsize-fix-v1-1-7858e9c5f844@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 arch/arm/boot/dts/samsung/exynos4412-i9300.dts   | 2 +-
 arch/arm/boot/dts/samsung/exynos4412-i9305.dts   | 2 +-
 arch/arm/boot/dts/samsung/exynos4412-n710x.dts   | 2 +-
 arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/samsung/exynos4412-i9300.dts b/arch/arm/boot/dts/samsung/exynos4412-i9300.dts
index 61aca5798f38..b79d456e976d 100644
--- a/arch/arm/boot/dts/samsung/exynos4412-i9300.dts
+++ b/arch/arm/boot/dts/samsung/exynos4412-i9300.dts
@@ -18,7 +18,7 @@ / {
 
 	memory@...00000 {
 		device_type = "memory";
-		reg = <0x40000000 0x40000000>;
+		reg = <0x40000000 0x3fc00000>;
 	};
 };
 
diff --git a/arch/arm/boot/dts/samsung/exynos4412-i9305.dts b/arch/arm/boot/dts/samsung/exynos4412-i9305.dts
index 77083f1a8273..1048ef5d9bc3 100644
--- a/arch/arm/boot/dts/samsung/exynos4412-i9305.dts
+++ b/arch/arm/boot/dts/samsung/exynos4412-i9305.dts
@@ -11,7 +11,7 @@ / {
 
 	memory@...00000 {
 		device_type = "memory";
-		reg = <0x40000000 0x80000000>;
+		reg = <0x40000000 0x7fc00000>;
 	};
 };
 
diff --git a/arch/arm/boot/dts/samsung/exynos4412-n710x.dts b/arch/arm/boot/dts/samsung/exynos4412-n710x.dts
index 0a151437fc73..eee1000dea92 100644
--- a/arch/arm/boot/dts/samsung/exynos4412-n710x.dts
+++ b/arch/arm/boot/dts/samsung/exynos4412-n710x.dts
@@ -9,7 +9,7 @@ / {
 
 	memory@...00000 {
 		device_type = "memory";
-		reg = <0x40000000 0x80000000>;
+		reg = <0x40000000 0x7fc00000>;
 	};
 
 	/* bootargs are passed in by bootloader */
diff --git a/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi b/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi
index 39a3d1cbe4c3..28a605802733 100644
--- a/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi
+++ b/arch/arm/boot/dts/samsung/exynos4412-p4note.dtsi
@@ -23,7 +23,7 @@ / {
 
 	memory@...00000 {
 		device_type = "memory";
-		reg = <0x40000000 0x80000000>;
+		reg = <0x40000000 0x7fc00000>;
 	};
 
 	aliases {
-- 
2.34.1