linux-kernel - [PATCH 1/3] arm64: dts: tegra234: Fix CPU compatible string to cortex-a78ae

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Message-ID: <20260121104536.3214101-2-sumitg@nvidia.com>
Date: Wed, 21 Jan 2026 16:15:34 +0530
From: Sumit Gupta <sumitg@...dia.com>
To: <treding@...dia.com>, <jonathanh@...dia.com>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <devicetree@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <bbasu@...dia.com>, <sumitg@...dia.com>
Subject: [PATCH 1/3] arm64: dts: tegra234: Fix CPU compatible string to cortex-a78ae

The Tegra234 SoC uses Cortex-A78AE cores, not Cortex-A78. Update the
compatible string for all CPU nodes to match the actual hardware.

Tegra234 hardware reports:
  # head /proc/cpuinfo | egrep 'implementer|part'
  CPU implementer : 0x41
  CPU part        : 0xd42

Which maps to (from arch/arm64/include/asm/cputype.h):
  #define ARM_CPU_IMP_ARM              0x41
  #define ARM_CPU_PART_CORTEX_A78AE    0xD42

Fixes: a12cf5c339b08 ("arm64: tegra: Describe Tegra234 CPU hierarchy")
Signed-off-by: Sumit Gupta <sumitg@...dia.com>
---
 arch/arm64/boot/dts/nvidia/tegra234.dtsi | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
index 850c473235e3..13ec999e52ef 100644
--- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
@@ -5339,7 +5339,7 @@ cpus {
 		#size-cells = <0>;
 
 		cpu0_0: cpu@0 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x00000>;
 
@@ -5358,7 +5358,7 @@ cpu0_0: cpu@0 {
 		};
 
 		cpu0_1: cpu@100 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x00100>;
 
@@ -5377,7 +5377,7 @@ cpu0_1: cpu@100 {
 		};
 
 		cpu0_2: cpu@200 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x00200>;
 
@@ -5396,7 +5396,7 @@ cpu0_2: cpu@200 {
 		};
 
 		cpu0_3: cpu@300 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x00300>;
 
@@ -5415,7 +5415,7 @@ cpu0_3: cpu@300 {
 		};
 
 		cpu1_0: cpu@...00 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x10000>;
 
@@ -5434,7 +5434,7 @@ cpu1_0: cpu@...00 {
 		};
 
 		cpu1_1: cpu@...00 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x10100>;
 
@@ -5453,7 +5453,7 @@ cpu1_1: cpu@...00 {
 		};
 
 		cpu1_2: cpu@...00 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x10200>;
 
@@ -5472,7 +5472,7 @@ cpu1_2: cpu@...00 {
 		};
 
 		cpu1_3: cpu@...00 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x10300>;
 
@@ -5491,7 +5491,7 @@ cpu1_3: cpu@...00 {
 		};
 
 		cpu2_0: cpu@...00 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x20000>;
 
@@ -5510,7 +5510,7 @@ cpu2_0: cpu@...00 {
 		};
 
 		cpu2_1: cpu@...00 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x20100>;
 
@@ -5529,7 +5529,7 @@ cpu2_1: cpu@...00 {
 		};
 
 		cpu2_2: cpu@...00 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x20200>;
 
@@ -5548,7 +5548,7 @@ cpu2_2: cpu@...00 {
 		};
 
 		cpu2_3: cpu@...00 {
-			compatible = "arm,cortex-a78";
+			compatible = "arm,cortex-a78ae";
 			device_type = "cpu";
 			reg = <0x20300>;
 
-- 
2.34.1