linux-kernel - [PATCH v2 00/11] Add cache information to Amlogic SoC

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Message-ID: <20250825065240.22577-1-linux.amoon@gmail.com>
Date: Mon, 25 Aug 2025 12:21:40 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Neil Armstrong <neil.armstrong@...aro.org>,
	Kevin Hilman <khilman@...libre.com>,
	Jerome Brunet <jbrunet@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Amlogic Meson SoC support),
	linux-amlogic@...ts.infradead.org (open list:ARM/Amlogic Meson SoC support),
	devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS),
	linux-kernel@...r.kernel.org (open list)
Cc: Anand Moon <linux.amoon@...il.com>
Subject: [PATCH v2 00/11] Add cache information to Amlogic SoC

Most publicly available Amlogic datasheets mention that the CPU employs
a architecture, quad-core ARM Cortex-A53 and ARM Cortex A55 and
Cortex-A73 and Cortex-A53 cluster, sharing a unified L2 cache to enhance
overall system performance.

However, these documents typically omit details regarding the sizes of the
L1 data cache, L1 instruction cache, and L2 cache.

The patches in question align with the cache specifications provided by
ARM TRM for the respective CPU cores.

ARM Cortex-A53
L1: 32KB instruction + 32KB data cache
L2: Unified 512KB cache
L1 cache details, L2 cache details

[1] https://developer.arm.com/documentation/ddi0500/j/Level-1-Memory-System/About-the-L1-memory-system?lang=en
[2] https://developer.arm.com/documentation/ddi0500/j/Level-2-Memory-System/About-the-L2-memory-system?lang=en

ARM Cortex-A55
Cache sizes are implementation-dependent; refer to ARM documentation for configuration options.

[3] https://developer.arm.com/documentation/100442/0200/Functional-description/Introduction-to-the-Cortex-A55-core/Implementation-options

ARM Cortex-A73 (as used in Amlogic S922X and T7)
L1: Configurable, typically 64KB instruction + 64KB data
L2: Unified cache, configurable up to 1MB or more
L2 cache details,
4× Cortex-A73 cores (up to 1.8GHz) with 1MB shared L2 cache
2× Cortex-A53 cores with 256KB shared L2 cache

[4] https://developer.arm.com/documentation/100048/0100/level-1-memory-system/about-the-l1-memory-system?lang=enL2
[5] https://developer.arm.com/documentation/100048/0100/level-2-memory-system/about-the-l2-memory-system?lang=en
[6] https://androidpctv.com/comparative-amlogic-s922x/

Changes:
v2: Modified the commit message and added cache information few more SoC.

v1: https://lists.infradead.org/pipermail/linux-arm-kernel/2024-February/901497.html

Thanks
-Anand

Anand Moon (11):
  arm64: dts: amlogic: Add cache information to the Amlogic GXBB and GXL
    SoC
  arm64: dts: amlogic: Add cache information to the Amlogic SM1 SoC
  arm64: dts: amlogic: Add cache information to the Amlogic G12A SoCS
  arm64: dts: amlogic: Add cache information to the Amlogic AXG SoCS
  arm64: dts: amlogic: Add cache information to the Amlogic GXM SoCS
  arm64: dts: amlogic: Add cache information to the Amlogic A1 SoC
  arm64: dts: amlogic: Add cache information to the Amlogic A4 SoC
  arm64: dts: amlogic: Add cache information to the Amlogic C3 SoC
  arm64: dts: amlogic: Add cache information to the Amlogic S7 SoC
  arm64: dts: amlogic: Add cache information to the Amlogic S922X SoC
  arm64: dts: amlogic: Add cache information to the Amlogic T7 SoC

 arch/arm64/boot/dts/amlogic/amlogic-a4.dtsi | 37 +++++++++++
 arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi | 23 +++++++
 arch/arm64/boot/dts/amlogic/amlogic-s7.dtsi | 36 ++++++++++
 arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi | 74 +++++++++++++++++++++
 arch/arm64/boot/dts/amlogic/meson-a1.dtsi   | 15 +++++
 arch/arm64/boot/dts/amlogic/meson-axg.dtsi  | 21 ++++++
 arch/arm64/boot/dts/amlogic/meson-g12a.dtsi | 27 ++++++++
 arch/arm64/boot/dts/amlogic/meson-g12b.dtsi | 62 +++++++++++++++--
 arch/arm64/boot/dts/amlogic/meson-gx.dtsi   | 27 ++++++++
 arch/arm64/boot/dts/amlogic/meson-gxm.dtsi  | 24 +++++++
 arch/arm64/boot/dts/amlogic/meson-sm1.dtsi  | 27 ++++++++
 11 files changed, 366 insertions(+), 7 deletions(-)


base-commit: 1b237f190eb3d36f52dffe07a40b5eb210280e00
-- 
2.50.1