linux-kernel - [PATCH v1 2/2] dt-bindings: riscv: add a capacity-dmips-mhz cpu property

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Message-Id: <20230104180513.1379453-3-conor@kernel.org>
Date:   Wed,  4 Jan 2023 18:05:14 +0000
From:   Conor Dooley <conor@...nel.org>
To:     palmer@...belt.com
Cc:     conor@...nel.org, Conor Dooley <conor.dooley@...rochip.com>,
        Ley Foon Tan <leyfoon.tan@...rfivetech.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>, Alex Shi <alexs@...nel.org>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-doc@...r.kernel.org
Subject: [PATCH v1 2/2] dt-bindings: riscv: add a capacity-dmips-mhz cpu property

From: Conor Dooley <conor.dooley@...rochip.com>

Since commit 03f11f03dbfe ("RISC-V: Parse cpu topology during boot.")
RISC-V has used the generic arch topology code, which provides for
disparate CPU capacities. We never defined a binding to acquire this
information from the DT though, so document the one already used by the
generic arch topology code: "capacity-dmips-mhz".

Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
---
 Documentation/devicetree/bindings/riscv/cpus.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml
index c6720764e765..2480c2460759 100644
--- a/Documentation/devicetree/bindings/riscv/cpus.yaml
+++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
@@ -114,6 +114,12 @@ properties:
       List of phandles to idle state nodes supported
       by this hart (see ./idle-states.yaml).
 
+  capacity-dmips-mhz:
+    description:
+      u32 value representing CPU capacity (see ../cpu/cpu-capacity.txt) in
+      DMIPS/MHz, relative to highest capacity-dmips-mhz
+      in the system.
+
 required:
   - riscv,isa
   - interrupt-controller
-- 
2.39.0