170 lines
4.5 KiB
YAML
170 lines
4.5 KiB
YAML
# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/devfreq/event/samsung,exynos-ppmu.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Samsung Exynos SoC PPMU (Platform Performance Monitoring Unit)
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maintainers:
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- Chanwoo Choi <cw00.choi@samsung.com>
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- Krzysztof Kozlowski <krzk@kernel.org>
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description: |
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The Samsung Exynos SoC has PPMU (Platform Performance Monitoring Unit) for
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each IP. PPMU provides the primitive values to get performance data. These
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PPMU events provide information of the SoC's behaviors so that you may use to
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analyze system performance, to make behaviors visible and to count usages of
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each IP (DMC, CPU, RIGHTBUS, LEFTBUS, CAM interface, LCD, G3D, MFC). The
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Exynos PPMU driver uses the devfreq-event class to provide event data to
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various devfreq devices. The devfreq devices would use the event data when
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derterming the current state of each IP.
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properties:
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compatible:
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enum:
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- samsung,exynos-ppmu
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- samsung,exynos-ppmu-v2
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clock-names:
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items:
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- const: ppmu
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clocks:
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maxItems: 1
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reg:
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maxItems: 1
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events:
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type: object
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patternProperties:
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'^ppmu-event[0-9]+(-[a-z0-9]+){,2}$':
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type: object
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properties:
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event-name:
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description: |
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The unique event name among PPMU device
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$ref: /schemas/types.yaml#/definitions/string
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event-data-type:
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description: |
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Define the type of data which shell be counted by the counter.
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You can check include/dt-bindings/pmu/exynos_ppmu.h for all
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possible type, i.e. count read requests, count write data in
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bytes, etc. This field is optional and when it is missing, the
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driver code will use default data type.
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$ref: /schemas/types.yaml#/definitions/uint32
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required:
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- event-name
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additionalProperties: false
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additionalProperties: false
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required:
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- compatible
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- reg
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additionalProperties: false
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examples:
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- |
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// PPMUv1 nodes for Exynos3250 (although the board DTS defines events)
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#include <dt-bindings/clock/exynos3250.h>
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ppmu_dmc0: ppmu@106a0000 {
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compatible = "samsung,exynos-ppmu";
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reg = <0x106a0000 0x2000>;
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events {
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ppmu_dmc0_3: ppmu-event3-dmc0 {
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event-name = "ppmu-event3-dmc0";
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};
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ppmu_dmc0_2: ppmu-event2-dmc0 {
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event-name = "ppmu-event2-dmc0";
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};
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ppmu_dmc0_1: ppmu-event1-dmc0 {
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event-name = "ppmu-event1-dmc0";
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};
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ppmu_dmc0_0: ppmu-event0-dmc0 {
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event-name = "ppmu-event0-dmc0";
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};
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};
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};
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ppmu_rightbus: ppmu@112a0000 {
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compatible = "samsung,exynos-ppmu";
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reg = <0x112a0000 0x2000>;
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clocks = <&cmu CLK_PPMURIGHT>;
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clock-names = "ppmu";
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events {
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ppmu_rightbus_3: ppmu-event3-rightbus {
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event-name = "ppmu-event3-rightbus";
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};
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};
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};
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- |
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// PPMUv2 nodes in Exynos5433
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ppmu_d0_cpu: ppmu@10480000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x10480000 0x2000>;
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};
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ppmu_d0_general: ppmu@10490000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x10490000 0x2000>;
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events {
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ppmu_event0_d0_general: ppmu-event0-d0-general {
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event-name = "ppmu-event0-d0-general";
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};
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};
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};
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ppmu_d0_rt: ppmu@104a0000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x104a0000 0x2000>;
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};
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ppmu_d1_cpu: ppmu@104b0000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x104b0000 0x2000>;
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};
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ppmu_d1_general: ppmu@104c0000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x104c0000 0x2000>;
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};
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ppmu_d1_rt: ppmu@104d0000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x104d0000 0x2000>;
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};
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- |
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// PPMUv1 nodes with event-data-type for Exynos4412
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#include <dt-bindings/pmu/exynos_ppmu.h>
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ppmu@106a0000 {
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compatible = "samsung,exynos-ppmu";
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reg = <0x106a0000 0x2000>;
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clocks = <&clock 400>;
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clock-names = "ppmu";
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events {
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ppmu-event3-dmc0 {
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event-name = "ppmu-event3-dmc0";
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event-data-type = <(PPMU_RO_DATA_CNT |
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PPMU_WO_DATA_CNT)>;
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};
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};
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};
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