linux-kernel - Re: [PATCHv7 05/10] devfreq: event: Add documentation for exynos-ppmu devfreq-event driver

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Date:	Mon, 12 Jan 2015 08:11:25 +0000 (GMT)
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	최찬우 <cw00.choi@...sung.com>,
	"kgene@...nel.org" <kgene@...nel.org>
Cc:	박경민 <kyungmin.park@...sung.com>,
	"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	ABHILASH KESAVAN <a.kesavan@...sung.com>,
	"tomasz.figa@...il.com" <tomasz.figa@...il.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	대인기 <inki.dae@...sung.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCHv7 05/10] devfreq: event: Add documentation for exynos-ppmu
 devfreq-event driver


I have rephrased part of the documentation for better readability.
Some semantics is guessed so you may need to re-rephrase.

Other than that, Acked-by: MyungJoo Ham <myungjoo.ham@...sung.com>


>  This patch adds the documentation for Exynos PPMU (Platform Performance
> Monitoring Unit) devfreq-event driver.
> 
> Cc: MyungJoo Ham <myungjoo.ham@...sung.com>
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
>  .../bindings/devfreq/event/exynos-ppmu.txt         | 110 +++++++++++++++++++++
>  1 file changed, 110 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
> 
> diff --git a/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt b/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
> new file mode 100644
> index 0000000..e665d30
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
> @@ -0,0 +1,110 @@
> +
> +* Samsung Exynos PPMU (Performance Profiling Monitoring Unit) device
> +
> +The Samsung Exynos SoC have PPMU (Performance Profiling Monitoring Unit) for

The Samsung Exynos SoC has PPMU (Performance Profiling Monitoring Unit) for
(have->has)

> +each IPs. PPMU provides the primitive values to get performance data. These

each IP. PPMU provides primitive values to get performance data.
(IPs->IP)

> +events provide useful information about the behavior of the SoC that you can

PPMU events provide information of the SoC's behaviors so that you may

> +use when analyzing system performance, and made visible and can be counted

use to analyze system performance, to make behaviors visible, and to count

> +using login in each IP (DMC, CPU, RIGHTBUS, LEFTBUS, CAM interface, LCD, G3D,

usages of each IP ( .... )

> +MFC). The Exynos PPMU driver use the devfreq-event class to provide event data

use -> uses

> +to various devfreq device. The devfreq device would use the event data when

device -> devices

> +derterming the current state of each IP.
> +
> +Required properties:
> +- compatible: Should be "samsung,exynos-ppmu".
> +- reg: physical base address of each PPMU and length of memory mapped region.
> +
> +Optional properties:
> +- clock-names : the name of clock used by the PPMU, "ppmu"
> +- clocks : phandles for clock specified in "clock-names" property
> +- #clock-cells: should be 1.
> +

[]