linux-kernel - [PATCH] ARM: dts: microchip: sama7d65: add Cortex-A7 PMU node

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Message-ID: <20260126131035.6964-2-mihai.sain@microchip.com>
Date: Mon, 26 Jan 2026 15:10:23 +0200
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>
CC: <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Mihai Sain <mihai.sain@...rochip.com>
Subject: [PATCH] ARM: dts: microchip: sama7d65: add Cortex-A7 PMU node

Add the Performance Monitoring Unit (PMU) node with the appropriate
compatible string, interrupt line, and affinity so that perf and other
PMU‑based tooling can function correctly on this SoC.

[root@...A7D65 ~]$ dmesg | grep -i pmu
[    1.487869] hw-perfevents: enabled with armv7_cortex_a7 PMU driver, 5 (8000000f) counters available

[root@...A7D65 ~]$ perf list hw
List of pre-defined events (to be used in -e or -M):

branch-instructions OR branches                    [Hardware event]
branch-misses                                      [Hardware event]
bus-cycles                                         [Hardware event]
cache-misses                                       [Hardware event]
cache-references                                   [Hardware event]
cpu-cycles OR cycles                               [Hardware event]
instructions                                       [Hardware event]

Signed-off-by: Mihai Sain <mihai.sain@...rochip.com>
---
 arch/arm/boot/dts/microchip/sama7d65.dtsi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/microchip/sama7d65.dtsi b/arch/arm/boot/dts/microchip/sama7d65.dtsi
index 868045c650a7..1e1ca4f93969 100644
--- a/arch/arm/boot/dts/microchip/sama7d65.dtsi
+++ b/arch/arm/boot/dts/microchip/sama7d65.dtsi
@@ -45,6 +45,12 @@ L2: l2-cache {
 		};
 	};
 
+	pmu {
+		compatible = "arm,cortex-a7-pmu";
+		interrupts = <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-affinity = <&cpu0>;
+	};
+
 	clocks {
 		main_xtal: clock-mainxtal {
 			compatible = "fixed-clock";

base-commit: 63804fed149a6750ffd28610c5c1c98cce6bd377
-- 
2.52.0