a622789aee
This patch updates the documentation to include the information of PPMUv2. The PPMUv2 is used for Exynos5433 and Exynos7420 to monitor the performance of each IP in Exynos SoC. Cc: MyungJoo Ham <myungjoo.ham@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
148 lines
3.5 KiB
Plaintext
148 lines
3.5 KiB
Plaintext
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* Samsung Exynos PPMU (Platform Performance Monitoring Unit) device
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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
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use to analyze system performance, to make behaviors visible and to count
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usages of each IP (DMC, CPU, RIGHTBUS, LEFTBUS, CAM interface, LCD, G3D, MFC).
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The Exynos PPMU driver uses the devfreq-event class to provide event data
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to 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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Required properties:
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- compatible: Should be "samsung,exynos-ppmu" or "samsung,exynos-ppmu-v2.
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- reg: physical base address of each PPMU and length of memory mapped region.
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Optional properties:
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- clock-names : the name of clock used by the PPMU, "ppmu"
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- clocks : phandles for clock specified in "clock-names" property
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Example1 : PPMUv1 nodes in exynos3250.dtsi are listed below.
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ppmu_dmc0: ppmu_dmc0@106a0000 {
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compatible = "samsung,exynos-ppmu";
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reg = <0x106a0000 0x2000>;
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status = "disabled";
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};
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ppmu_dmc1: ppmu_dmc1@106b0000 {
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compatible = "samsung,exynos-ppmu";
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reg = <0x106b0000 0x2000>;
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status = "disabled";
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};
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ppmu_cpu: ppmu_cpu@106c0000 {
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compatible = "samsung,exynos-ppmu";
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reg = <0x106c0000 0x2000>;
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status = "disabled";
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};
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ppmu_rightbus: ppmu_rightbus@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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status = "disabled";
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};
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ppmu_leftbus: ppmu_leftbus0@116a0000 {
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compatible = "samsung,exynos-ppmu";
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reg = <0x116a0000 0x2000>;
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clocks = <&cmu CLK_PPMULEFT>;
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clock-names = "ppmu";
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status = "disabled";
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};
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Example2 : Events of each PPMU node in exynos3250-rinato.dts are listed below.
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&ppmu_dmc0 {
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status = "okay";
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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_dmc1 {
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status = "okay";
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events {
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ppmu_dmc1_3: ppmu-event3-dmc1 {
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event-name = "ppmu-event3-dmc1";
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};
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};
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};
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&ppmu_leftbus {
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status = "okay";
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events {
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ppmu_leftbus_3: ppmu-event3-leftbus {
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event-name = "ppmu-event3-leftbus";
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};
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};
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};
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&ppmu_rightbus {
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status = "okay";
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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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Example3 : PPMUv2 nodes in exynos5433.dtsi are listed below.
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ppmu_d0_cpu: ppmu_d0_cpu@10480000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x10480000 0x2000>;
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status = "disabled";
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};
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ppmu_d0_general: ppmu_d0_general@10490000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x10490000 0x2000>;
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status = "disabled";
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};
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ppmu_d0_rt: ppmu_d0_rt@104a0000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x104a0000 0x2000>;
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status = "disabled";
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};
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ppmu_d1_cpu: ppmu_d1_cpu@104b0000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x104b0000 0x2000>;
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status = "disabled";
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};
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ppmu_d1_general: ppmu_d1_general@104c0000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x104c0000 0x2000>;
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status = "disabled";
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};
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ppmu_d1_rt: ppmu_d1_rt@104d0000 {
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compatible = "samsung,exynos-ppmu-v2";
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reg = <0x104d0000 0x2000>;
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status = "disabled";
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};
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