linux-kernel - Re: [PATCH v3 5/6] dt-bindings: Document devicetree binding for ARM DSU PMU

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Date:   Thu, 27 Jul 2017 10:52:37 -0500
From:   Rob Herring <robh@...nel.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Will Deacon <will.deacon@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Jonathan.Cameron@...wei.com,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 5/6] dt-bindings: Document devicetree binding for ARM
 DSU PMU

+DT list

On Thu, Jul 27, 2017 at 10:10 AM, Suzuki K Poulose
<suzuki.poulose@....com> wrote:
> This patch documents the devicetree bindings for ARM DSU PMU.
>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Rob Herring <robh@...nel.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  .../devicetree/bindings/arm/arm-dsu-pmu.txt        | 27 ++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/arm-dsu-pmu.txt
>
> diff --git a/Documentation/devicetree/bindings/arm/arm-dsu-pmu.txt b/Documentation/devicetree/bindings/arm/arm-dsu-pmu.txt
> new file mode 100644
> index 0000000..b9935ac
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/arm-dsu-pmu.txt
> @@ -0,0 +1,27 @@
> +* ARM DynamIQ Shared Unit (DSU) Performance Monitor Unit (PMU)
> +
> +ARM DyanmIQ Shared Unit (DSU) integrates one or more CPU cores
> +with a shared L3 memory system, control logic and external interfaces to
> +form a multicore cluster. The PMU enables to gather various statistics on
> +the operations of the DSU. The PMU provides independent 32bit counters that
> +can count any of the supported events, along with a 64bit cycle counter.
> +The PMU is accessed via CPU system registers and has no MMIO component.
> +
> +** DSU PMU required properties:
> +
> +- compatible   : should be one of :
> +
> +               "arm,dsu-pmu"

Seems kind of generic. There's only one flavor is DSU?

> +
> +- interrupts   : Exactly 1 SPI must be listed.
> +
> +- cpus         : List of phandles for the CPUs connected to this DSU instance.
> +
> +
> +** Example:
> +
> +dsu_pmu@0 {

Don't use "_" in node names and unit-address is not valid without a
reg property.

> +       compatible = "arm,dsu-pmu";
> +       interrupts = <GIC_SPI 02 IRQ_TYPE_LEVEL_HIGH>;
> +       cpus = <&cpu_0>, <&cpu_1>;
> +};
> --
> 2.7.5
>