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    Subject[PATCH 3/3] Documentation: devicetree: add PPMU events description
    Date
    Extend the documenation by events description with new 'event-data-type'
    field. Add example how the event might be defined in DT.

    Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
    ---
    .../devicetree/bindings/devfreq/event/exynos-ppmu.txt | 18 ++++++++++++++++++
    1 file changed, 18 insertions(+)

    diff --git a/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt b/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
    index 3e36c1d..47feb5f 100644
    --- a/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
    +++ b/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
    @@ -145,3 +145,21 @@ Example3 : PPMUv2 nodes in exynos5433.dtsi are listed below.
    reg = <0x104d0000 0x2000>;
    status = "disabled";
    };
    +
    +The 'event' type specified in the PPMU node defines 'event-name'
    +which also contains 'id' number and optionally 'event-data-type'.
    +
    +Example:
    +
    + events {
    + ppmu_leftbus_0: ppmu-event0-leftbus {
    + event-name = "ppmu-event0-leftbus";
    + event-data-type = <PPMU_RO_DATA_CNT>;
    + };
    + };
    +
    +The 'event-data-type' defines the type of data which shell be counted
    +by the counter. You can check include/dt-bindings/pmu/exynos_ppmu.h for
    +all possible type, i.e. count read requests, count write data in bytes,
    +etc. This field is optional and when it is missing, the driver code will
    +use default data type.
    --
    2.7.4
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