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|
# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/devfreq/event/samsung,exynos-ppmu.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Samsung Exynos SoC PPMU (Platform Performance Monitoring Unit)
maintainers:
- Chanwoo Choi <cw00.choi@samsung.com>
- Krzysztof Kozlowski <krzk@kernel.org>
description: |
The Samsung Exynos SoC has PPMU (Platform Performance Monitoring Unit) for
each IP. PPMU provides the primitive values to get performance data. These
PPMU events provide information of the SoC's behaviors so that you may use to
analyze system performance, to make behaviors visible and to count usages of
each IP (DMC, CPU, RIGHTBUS, LEFTBUS, CAM interface, LCD, G3D, MFC). The
Exynos PPMU driver uses the devfreq-event class to provide event data to
various devfreq devices. The devfreq devices would use the event data when
determining the current state of each IP.
properties:
compatible:
enum:
- samsung,exynos-ppmu
- samsung,exynos-ppmu-v2
clock-names:
items:
- const: ppmu
clocks:
maxItems: 1
reg:
maxItems: 1
events:
type: object
patternProperties:
'^ppmu-event[0-9]+(-[a-z0-9]+){,2}$':
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)>;
};
};
};
|
