linux-kernel - [PATCH] riscv: Add cpu topology DT entry.

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Date:   Mon, 24 Jun 2019 15:38:19 -0700
From:   Atish Patra <atish.patra@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Yash Shah <yash.shah@...ive.com>
Subject: [PATCH] riscv: Add cpu topology DT entry.

Currently, there is no CPU topology defined for RISC-V.
The following series adds topology support in RISC-V.

http://lists.infradead.org/pipermail/linux-riscv/2019-June/005072.html

Add a DT node for unleashed that describes the CPU topology
present in HiFive Unleashed.

Signed-off-by: Atish Patra <atish.patra@....com>
---
 arch/riscv/boot/dts/sifive/fu540-c000.dtsi | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/riscv/boot/dts/sifive/fu540-c000.dtsi b/arch/riscv/boot/dts/sifive/fu540-c000.dtsi
index 83f40b00ab63..907564f4f07a 100644
--- a/arch/riscv/boot/dts/sifive/fu540-c000.dtsi
+++ b/arch/riscv/boot/dts/sifive/fu540-c000.dtsi
@@ -22,6 +22,24 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 		timebase-frequency = <1000000>;
+
+		cpu-map {
+			cluster0 {
+				core0 {
+					cpu = <&cpu1>;
+				};
+				core1 {
+					cpu = <&cpu2>;
+				};
+				core2 {
+					cpu = <&cpu3>;
+				};
+				core3 {
+					cpu = <&cpu4>;
+				};
+			};
+		};
+
 		cpu0: cpu@0 {
 			compatible = "sifive,e51", "sifive,rocket0", "riscv";
 			device_type = "cpu";
-- 
2.21.0