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From:   Guo Ren <guoren@kernel.org>
Date:   Tue, 4 Jun 2019 13:38:33 +0800
Message-ID: <CAJF2gTT0bkBwxpmR2xzPWwHk8E_v-uA-Zcf_JY4x_SKMkXAsnQ@mail.gmail.com>
Subject: Re: [PATCH V4 4/6] dt-bindings: csky: Add csky PMU bindings
To:     Mao Han <han_mao@c-sky.com>
Cc:     linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org,
        Rob Herring <robh+dt@kernel.org>
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Reviewed-by: Guo Ren <ren_guo@c-sky.com>

On Tue, Jun 4, 2019 at 10:25 AM Mao Han <han_mao@c-sky.com> wrote:
>
> This patch adds the documentation to describe that how to add pmu node in
> dts.
>
> Signed-off-by: Mao Han <han_mao@c-sky.com>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Guo Ren <guoren@kernel.org>
> ---
>  Documentation/devicetree/bindings/csky/pmu.txt | 38 ++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/csky/pmu.txt
>
> diff --git a/Documentation/devicetree/bindings/csky/pmu.txt b/Documentation/devicetree/bindings/csky/pmu.txt
> new file mode 100644
> index 0000000..53c3b0a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/csky/pmu.txt
> @@ -0,0 +1,38 @@
> +============================
> +C-SKY Performance Monitor Units
> +============================
> +
> +C-SKY 8xx series cores often have a PMU for counting cpu and cache events.
> +The C-SKY PMU representation in the device tree should be done as under:
> +
> +==============================
> +PMU node bindings definition
> +==============================
> +
> +       Description: Describes PMU
> +
> +       PROPERTIES
> +
> +       - compatible
> +               Usage: required
> +               Value type: <string>
> +               Definition: must be "csky,csky-pmu"
> +       - interrupts
> +               Usage: required
> +               Value type: <u32>
> +               Definition: must be pmu irq num defined by soc
> +       - count-width
> +               Usage: optional
> +               Value type: <u32>
> +               Definition: the width of pmu counter
> +
> +Examples:
> +---------
> +
> +        pmu {
> +                compatible = "csky,csky-pmu";
> +                interrupts = <0x17 IRQ_TYPE_EDGE_RISING>;
> +                interrupt-parent = <&intc>;
> +               count-width = <0x30>;
> +        };
> +
> --
> 2.7.4
>