linux-kernel - Re: [PATCH v1 1/2] dt-bindings: arm: move cpu-capacity to a shared loation

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Date:   Tue, 10 Jan 2023 17:02:58 +0800
From:   Yanteng Si <siyanteng@...ngson.cn>
To:     Conor Dooley <conor@...nel.org>, palmer@...belt.com
Cc:     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>,
        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: Re: [PATCH v1 1/2] dt-bindings: arm: move cpu-capacity to a shared
 loation


在 1/5/23 02:05, Conor Dooley 写道:
> From: Conor Dooley <conor.dooley@...rochip.com>
>
> RISC-V uses the same generic topology code as arm64 & while there
> currently exists no binding for cpu-capacity on RISC-V, the code paths
> can be hit if the property is present.
>
> Move the documentation of cpu-capacity to a shared location, ahead of
> defining a binding for capacity-dmips-mhz on RISC-V. Update some
> references to this document in the process.
>
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>

Reviewed-by: Yanteng Si <siyanteng@...ngson.cn>

> ---
> I wasn't sure what to do with reference [1], but since the property will
> be the same on RISC-V, I left it as is.
> ---
>   Documentation/devicetree/bindings/arm/cpus.yaml               | 2 +-
>   .../devicetree/bindings/{arm => cpu}/cpu-capacity.txt         | 4 ++--
>   Documentation/scheduler/sched-capacity.rst                    | 2 +-
>   Documentation/translations/zh_CN/scheduler/sched-capacity.rst | 2 +-
>   4 files changed, 5 insertions(+), 5 deletions(-)
>   rename Documentation/devicetree/bindings/{arm => cpu}/cpu-capacity.txt (98%)
>
> diff --git a/Documentation/devicetree/bindings/arm/cpus.yaml b/Documentation/devicetree/bindings/arm/cpus.yaml
> index 01b5a9c689a2..a7586295a6f5 100644
> --- a/Documentation/devicetree/bindings/arm/cpus.yaml
> +++ b/Documentation/devicetree/bindings/arm/cpus.yaml
> @@ -257,7 +257,7 @@ properties:
>   
>     capacity-dmips-mhz:
>       description:
> -      u32 value representing CPU capacity (see ./cpu-capacity.txt) in
> +      u32 value representing CPU capacity (see ../cpu/cpu-capacity.txt) in
>         DMIPS/MHz, relative to highest capacity-dmips-mhz
>         in the system.
>   
> diff --git a/Documentation/devicetree/bindings/arm/cpu-capacity.txt b/Documentation/devicetree/bindings/cpu/cpu-capacity.txt
> similarity index 98%
> rename from Documentation/devicetree/bindings/arm/cpu-capacity.txt
> rename to Documentation/devicetree/bindings/cpu/cpu-capacity.txt
> index cc5e190390b7..f28e1adad428 100644
> --- a/Documentation/devicetree/bindings/arm/cpu-capacity.txt
> +++ b/Documentation/devicetree/bindings/cpu/cpu-capacity.txt
> @@ -1,12 +1,12 @@
>   ==========================================
> -ARM CPUs capacity bindings
> +CPU capacity bindings
>   ==========================================
>   
>   ==========================================
>   1 - Introduction
>   ==========================================
>   
> -ARM systems may be configured to have cpus with different power/performance
> +Some systems may be configured to have cpus with different power/performance
>   characteristics within the same chip. In this case, additional information has
>   to be made available to the kernel for it to be aware of such differences and
>   take decisions accordingly.
> diff --git a/Documentation/scheduler/sched-capacity.rst b/Documentation/scheduler/sched-capacity.rst
> index 805f85f330b5..8e2b8538bc2b 100644
> --- a/Documentation/scheduler/sched-capacity.rst
> +++ b/Documentation/scheduler/sched-capacity.rst
> @@ -260,7 +260,7 @@ for that purpose.
>   
>   The arm and arm64 architectures directly map this to the arch_topology driver
>   CPU scaling data, which is derived from the capacity-dmips-mhz CPU binding; see
> -Documentation/devicetree/bindings/arm/cpu-capacity.txt.
> +Documentation/devicetree/bindings/cpu/cpu-capacity.txt.
>   
>   3.2 Frequency invariance
>   ------------------------
> diff --git a/Documentation/translations/zh_CN/scheduler/sched-capacity.rst b/Documentation/translations/zh_CN/scheduler/sched-capacity.rst
> index 3a52053c29dc..e07ffdd391d3 100644
> --- a/Documentation/translations/zh_CN/scheduler/sched-capacity.rst
> +++ b/Documentation/translations/zh_CN/scheduler/sched-capacity.rst
> @@ -233,7 +233,7 @@ CFS调度类基于实体负载跟踪机制（Per-Entity Load Tracking, PELT）
>   
>   arm和arm64架构直接把这个信息映射到arch_topology驱动的CPU scaling数据中（译注：参考
>   arch_topology.h的percpu变量cpu_scale），它是从capacity-dmips-mhz CPU binding中衍生计算
> -出来的。参见Documentation/devicetree/bindings/arm/cpu-capacity.txt。
> +出来的。参见Documentation/devicetree/bindings/cpu/cpu-capacity.txt。
>   
>   3.2 频率不变性
>   --------------