linux-kernel - [PATCH 7/9] arm64: dts: apple: t8011: Add CPU caches

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Message-Id: <20250220-caches-v1-7-2c7011097768@gmail.com>
Date: Thu, 20 Feb 2025 20:21:48 +0800
From: Nick Chan <towinchenmi@...il.com>
To: Sven Peter <sven@...npeter.dev>, Janne Grunau <j@...nau.net>, 
 Alyssa Rosenzweig <alyssa@...enzweig.io>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Nick Chan <towinchenmi@...il.com>
Subject: [PATCH 7/9] arm64: dts: apple: t8011: Add CPU caches

Add information about CPU caches in the P-cluster of Apple A10X SoC. Due to
"Apple Fusion Architecture" big.LITTLE switcher, only caches from one of
the clusters can be used at any given moment.

Signed-off-by: Nick Chan <towinchenmi@...il.com>
---
 arch/arm64/boot/dts/apple/t8011.dtsi | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm64/boot/dts/apple/t8011.dtsi b/arch/arm64/boot/dts/apple/t8011.dtsi
index 5b280c896b760dc8b759bf38dae79060e34dfc19..974f78cc77cfe28d3c26a52a292b643172d8f5bd 100644
--- a/arch/arm64/boot/dts/apple/t8011.dtsi
+++ b/arch/arm64/boot/dts/apple/t8011.dtsi
@@ -36,6 +36,9 @@ cpu0: cpu@0 {
 			performance-domains = <&cpufreq>;
 			enable-method = "spin-table";
 			device_type = "cpu";
+			next-level-cache = <&l2_cache>;
+			i-cache-size = <0x10000>; /* P-core */
+			d-cache-size = <0x10000>; /* P-core */
 		};
 
 		cpu1: cpu@1 {
@@ -46,6 +49,9 @@ cpu1: cpu@1 {
 			performance-domains = <&cpufreq>;
 			enable-method = "spin-table";
 			device_type = "cpu";
+			next-level-cache = <&l2_cache>;
+			i-cache-size = <0x10000>; /* P-core */
+			d-cache-size = <0x10000>; /* P-core */
 		};
 
 		cpu2: cpu@2 {
@@ -56,6 +62,16 @@ cpu2: cpu@2 {
 			performance-domains = <&cpufreq>;
 			enable-method = "spin-table";
 			device_type = "cpu";
+			next-level-cache = <&l2_cache>;
+			i-cache-size = <0x10000>; /* P-core */
+			d-cache-size = <0x10000>; /* P-core */
+		};
+
+		l2_cache: l2-cache {
+			compatible = "cache";
+			cache-level = <2>;
+			cache-unified;
+			cache-size = <0x800000>; /* P-cluster */
 		};
 	};
 

-- 
2.48.1