linux-kernel - [v4 10/11] riscv: dts: fu740: Add pmu node

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Message-Id: <20211025195350.242914-11-atish.patra@wdc.com>
Date:   Mon, 25 Oct 2021 12:53:49 -0700
From:   Atish Patra <atish.patra@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>, Anup Patel <anup.patel@....com>,
        David Abdurachmanov <david.abdurachmanov@...ive.com>,
        devicetree@...r.kernel.org, Greentime Hu <greentime.hu@...ive.com>,
        Guo Ren <guoren@...ux.alibaba.com>,
        Heinrich Schuchardt <xypron.glpk@....de>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        linux-perf-users@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Nick Kossifidis <mick@....forth.gr>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Vincent Chen <vincent.chen@...ive.com>
Subject: [v4 10/11] riscv: dts: fu740: Add pmu node

HiFive unmatched supports HPMCounters but does not implement mcountinhibit
or sscof extension. Thus, perf monitoring can be used on the unmatched
board without sampling.

Add the PMU node with compatible string so that Linux perf driver can
utilize this to enable PMU.

Signed-off-by: Atish Patra <atish.patra@....com>
---
 arch/riscv/boot/dts/sifive/fu740-c000.dtsi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/boot/dts/sifive/fu740-c000.dtsi b/arch/riscv/boot/dts/sifive/fu740-c000.dtsi
index abbb960f90a0..b35b96b58820 100644
--- a/arch/riscv/boot/dts/sifive/fu740-c000.dtsi
+++ b/arch/riscv/boot/dts/sifive/fu740-c000.dtsi
@@ -140,6 +140,9 @@ soc {
 		#size-cells = <2>;
 		compatible = "simple-bus";
 		ranges;
+		pmu {
+			compatible = "riscv,pmu";
+		};
 		plic0: interrupt-controller@...0000 {
 			#interrupt-cells = <1>;
 			#address-cells = <0>;
-- 
2.31.1