Documentation/devicetree/bindings/devfreq/event/samsung,exynos-ppmu.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/devfreq/event/samsung,exynos-ppmu.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Samsung Exynos SoC PPMU (Platform Performance Monitoring Unit)

maintainers:
  - Chanwoo Choi <cw00.choi@samsung.com>
  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

description: |
  The Samsung Exynos SoC has PPMU (Platform Performance Monitoring Unit) for
  each IP. PPMU provides the primitive values to get performance data. These
  PPMU events provide information of the SoC's behaviors so that you may use to
  analyze system performance, to make behaviors visible and to count usages of
  each IP (DMC, CPU, RIGHTBUS, LEFTBUS, CAM interface, LCD, G3D, MFC).  The
  Exynos PPMU driver uses the devfreq-event class to provide event data to
  various devfreq devices. The devfreq devices would use the event data when
  derterming the current state of each IP.

properties:
  compatible:
    enum:
      - samsung,exynos-ppmu
      - samsung,exynos-ppmu-v2

  clock-names:
    items:
      - const: ppmu

  clocks:
    maxItems: 1

  reg:
    maxItems: 1

  events:
    type: object

    patternProperties:
      '^ppmu-event[0-9]+(-[a-z0-9]+){,2}$':
        type: object
        properties:
          event-name:
            description: |
              The unique event name among PPMU device
            $ref: /schemas/types.yaml#/definitions/string

          event-data-type:
            description: |
              Define 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.
            $ref: /schemas/types.yaml#/definitions/uint32

        required:
          - event-name

        additionalProperties: false

    additionalProperties: false

required:
  - compatible
  - reg

additionalProperties: false

examples:
  - |
    // PPMUv1 nodes for Exynos3250 (although the board DTS defines events)
    #include <dt-bindings/clock/exynos3250.h>

    ppmu_dmc0: ppmu@106a0000 {
        compatible = "samsung,exynos-ppmu";
        reg = <0x106a0000 0x2000>;

        events {
            ppmu_dmc0_3: ppmu-event3-dmc0 {
                event-name = "ppmu-event3-dmc0";
            };

            ppmu_dmc0_2: ppmu-event2-dmc0 {
                event-name = "ppmu-event2-dmc0";
            };

            ppmu_dmc0_1: ppmu-event1-dmc0 {
                event-name = "ppmu-event1-dmc0";
            };

            ppmu_dmc0_0: ppmu-event0-dmc0 {
                event-name = "ppmu-event0-dmc0";
            };
        };
    };

    ppmu_rightbus: ppmu@112a0000 {
        compatible = "samsung,exynos-ppmu";
        reg = <0x112a0000 0x2000>;
        clocks = <&cmu CLK_PPMURIGHT>;
        clock-names = "ppmu";

        events {
            ppmu_rightbus_3: ppmu-event3-rightbus {
                event-name = "ppmu-event3-rightbus";
            };
        };
    };

  - |
    // PPMUv2 nodes in Exynos5433
    ppmu_d0_cpu: ppmu@10480000 {
        compatible = "samsung,exynos-ppmu-v2";
        reg = <0x10480000 0x2000>;
    };

    ppmu_d0_general: ppmu@10490000 {
        compatible = "samsung,exynos-ppmu-v2";
        reg = <0x10490000 0x2000>;

        events {
            ppmu_event0_d0_general: ppmu-event0-d0-general {
                event-name = "ppmu-event0-d0-general";
            };
        };
    };

    ppmu_d0_rt: ppmu@104a0000 {
        compatible = "samsung,exynos-ppmu-v2";
        reg = <0x104a0000 0x2000>;
    };

    ppmu_d1_cpu: ppmu@104b0000 {
        compatible = "samsung,exynos-ppmu-v2";
        reg = <0x104b0000 0x2000>;
    };

    ppmu_d1_general: ppmu@104c0000 {
        compatible = "samsung,exynos-ppmu-v2";
        reg = <0x104c0000 0x2000>;
    };

    ppmu_d1_rt: ppmu@104d0000 {
        compatible = "samsung,exynos-ppmu-v2";
        reg = <0x104d0000 0x2000>;
    };

  - |
    // PPMUv1 nodes with event-data-type for Exynos4412
    #include <dt-bindings/pmu/exynos_ppmu.h>

    ppmu@106a0000 {
        compatible = "samsung,exynos-ppmu";
        reg = <0x106a0000 0x2000>;
        clocks = <&clock 400>;
        clock-names = "ppmu";

        events {
            ppmu-event3-dmc0 {
                event-name = "ppmu-event3-dmc0";
                event-data-type = <(PPMU_RO_DATA_CNT |
                                    PPMU_WO_DATA_CNT)>;
            };
        };
    };