linux-kernel - Re: [PATCH 0/7] PM / devfreq: Add NoCP devfreq-event and support busfreq on exyno5422-odroidxu3

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Message-id: <570B24E9.5020708@samsung.com>
Date:	Mon, 11 Apr 2016 13:15:37 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
	k.kozlowski@...sung.com, kgene@...nel.org, s.nawrocki@...sung.com,
	tomasz.figa@...il.com
Cc:	rjw@...ysocki.net, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, linux@....linux.org.uk,
	linux.amoon@...il.com, m.reichl@...etechno.de,
	tjakobi@...h.uni-bielefeld.de, inki.dae@...sung.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 0/7] PM / devfreq: Add NoCP devfreq-event and support
 busfreq on exyno5422-odroidxu3

Dear all,

On 2016년 04월 08일 14:00, Chanwoo Choi wrote:
> This patchset support the AMBA bus frequency scaling on Exynos5422-based
> Odroid-XU3 board. But, this series only support the bus frequency scaling
> for INT (Internal) block using VDD_INT power line.
> 
> Also, to support the bus frequency scaling for Exynos542x SoC,
> Exynos542x SoC has the specific 'NoC (Network on Chip) Probe' device
> to measure the transfered data traffic on NoC (Network on Chip)
> instead of PPMU (Platform Performance Monitoring Unit). NoC Probe device
> provide the utilization for INT block of Exynos542x SoC.
> 
> The generic exynos-bus frequency driver uses the 'NoC Probe' devfreq-event
> device (drivers/devfreq/event/exynos-nocp.c) without any modification.
> Just add the phandle of 'NoC Probe' dt node to bus dt node.
> 
> Depend on:
> This patchset depends on patch[1] which support the generic exynos-bus
> frequency driver.
> 
> [1] https://lkml.org/lkml/2016/4/8/14
> - [PATCH v8 00/20] PM / devferq: Add generic exynos bus frequency driver and new passive governor

The dependency of these patch-set is changed from patches[1] to patches[2].
Because patches[1] has the possible recursive locking issue. Patches[2] fix this issue.

[2] http://www.spinics.net/lists/arm-kernel/msg495976.html
- [PATCH v9 00/20] PM / devferq: Add generic exynos bus frequency driver and new passive governor

[snip]

Best Regards,
Chanwoo Choi