linux-kernel - Re: Fwd: [PATCH v2 0/8] PM / devfreq: Add NoCP devfreq-event and support busfreq on exyno5422-odroidxu3

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Date:	Tue, 03 May 2016 11:17:45 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	myungjoo.ham@...sung.com,
	박경민 <kyungmin.park@...sung.com>,
	크쉬시토프 <k.kozlowski@...sung.com>,
	"tomasz.figa@...il.com" <tomasz.figa@...il.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	"kgene@...nel.org" <kgene@...nel.org>
Cc:	"robh@...nel.org" <robh@...nel.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux.amoon@...il.com" <linux.amoon@...il.com>,
	"m.reichl@...etechno.de" <m.reichl@...etechno.de>,
	"tjakobi@...h.uni-bielefeld.de" <tjakobi@...h.uni-bielefeld.de>,
	대인기 <inki.dae@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: Fwd: [PATCH v2 0/8] PM / devfreq: Add NoCP devfreq-event and
 support busfreq on exyno5422-odroidxu3

Dear Myungjoo,

On 2016년 05월 02일 14:48, MyungJoo Ham wrote:
> Sender : 최찬우<cw00.choi@...sung.com> S5(책임)/Change Agent/Tizen Platform Lab(S/W센터)/삼성전자
> Date : 2016-04-15 15:32 (GMT+09:00)
>>
>> 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.
> 
> Along with Devfreq/Passive patchset, the patchset is merged in
> devfreq for-4.7 tree.
> 
> https://git.kernel.org/cgit/linux/kernel/git/mzx/devfreq.git/log/?h=for-4.7
> 
> @Chanwoo: If there are commits to be merged by a tree other than Linux/PM,
> please let me know. I'll send out pull-request soon.

On Krzysztof Kozlowski's reply, dts patches will be merged on samsung-soc tree.
and then the clock patches about exynos5420 was already merged to samsung-clk tree
by Sylwester.

Only devfreq patches should be merged on devfreq tree.

We already discussed this topic on offline. I expect that you will again handle
this patchset according to reply of both Krzysztof and me.

Best Regards,
Chanwoo Choi

> 
> 
> Cheers,
> MyungJoo
> 
>>
>> 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] 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
>>
>>