linux-kernel - [PATCH v2 1/2] ARM: dts: microchip: sama7d65: Add cache configuration for cpu node

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Message-ID: <20250618103914.2712-2-mihai.sain@microchip.com>
Date: Wed, 18 Jun 2025 13:39:13 +0300
From: Mihai Sain <mihai.sain@...rochip.com>
To: <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
	<claudiu.beznea@...on.dev>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: Mihai Sain <mihai.sain@...rochip.com>
Subject: [PATCH v2 1/2] ARM: dts: microchip: sama7d65: Add cache configuration for cpu node

Describe the cache memories according with datasheet chapter 15.2:
- L1 cache configuration with 32KB for both data and instruction cache.
- L2 cache configuration with 256KB unified cache.

Before this patch:
[    0.161955] cacheinfo: Unable to detect cache hierarchy for CPU 0

After this patch:
[root@...a7d65eb ~]$ ll -h /sys/bus/cpu/devices/cpu0/of_node/l1-cache
-r--r--r-- 1 root root 4 Jun 18 12:16 cache-level
-r--r--r-- 1 root root 6 Jun 18 12:16 compatible
-r--r--r-- 1 root root 4 Jun 18 12:16 d-cache-size
-r--r--r-- 1 root root 4 Jun 18 12:16 i-cache-size
-r--r--r-- 1 root root 9 Jun 18 12:16 name
-r--r--r-- 1 root root 4 Jun 18 12:16 next-level-cache
-r--r--r-- 1 root root 4 Jun 18 12:16 phandle

[root@...a7d65eb ~]$ ll -h /sys/bus/cpu/devices/cpu0/of_node/l2-cache
-r--r--r-- 1 root root 4 Jun 18 12:27 cache-level
-r--r--r-- 1 root root 4 Jun 18 12:27 cache-size
-r--r--r-- 1 root root 0 Jun 18 12:27 cache-unified
-r--r--r-- 1 root root 6 Jun 18 12:27 compatible
-r--r--r-- 1 root root 9 Jun 18 12:27 name
-r--r--r-- 1 root root 4 Jun 18 12:27 phandle

Signed-off-by: Mihai Sain <mihai.sain@...rochip.com>
---
 arch/arm/boot/dts/microchip/sama7d65.dtsi | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm/boot/dts/microchip/sama7d65.dtsi b/arch/arm/boot/dts/microchip/sama7d65.dtsi
index d08d773b1cc5..06a5aae93101 100644
--- a/arch/arm/boot/dts/microchip/sama7d65.dtsi
+++ b/arch/arm/boot/dts/microchip/sama7d65.dtsi
@@ -32,6 +32,22 @@ cpu0: cpu@0 {
 			device_type = "cpu";
 			clocks = <&pmc PMC_TYPE_CORE PMC_CPUPLL>;
 			clock-names = "cpu";
+			next-level-cache = <&L1>;
+
+			L1: l1-cache {
+				compatible = "cache";
+				cache-level = <1>;
+				d-cache-size = <32768>;
+				i-cache-size = <32768>;
+				next-level-cache = <&L2>;
+			};
+
+			L2: l2-cache {
+				compatible = "cache";
+				cache-level = <2>;
+				cache-size = <262144>;
+				cache-unified;
+			};
 		};
 	};
 
-- 
2.50.0