linux-kernel - Re: [PATCH v10 0/8] power: add power sequence library

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Date:   Tue, 20 Dec 2016 12:31:12 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Peter Chen <peter.chen@....com>, mark.rutland@....com,
        ulf.hansson@...aro.org, heiko@...ech.de, stephen.boyd@...aro.org,
        linux-kernel@...r.kernel.org, gary.bisson@...ndarydevices.com,
        festevam@...il.com, stillcompiling@...il.com, arnd@...db.de,
        dbaryshkov@...il.com, vaibhav.hiremath@...aro.org,
        mka@...omium.org, stern@...land.harvard.edu,
        devicetree@...r.kernel.org, mail@...iej.szmigiero.name,
        pawel.moll@....com, linux-pm@...r.kernel.org,
        s.hauer@...gutronix.de, troy.kisky@...ndarydevices.com,
        robh+dt@...nel.org, linux-arm-kernel@...ts.infradead.org,
        oscar@...andei.net, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, rjw@...ysocki.net, sre@...nel.org,
        broonie@...nel.org, p.zabel@...gutronix.de, shawnguo@...nel.org
Subject: Re: [PATCH v10 0/8] power: add power sequence library

On Mon, Dec 19, 2016 at 09:15:04PM +0200, Krzysztof Kozlowski wrote:
> On Mon, Nov 14, 2016 at 09:35:51AM +0800, Peter Chen wrote:
> > Hi all,
> > 
> > This is a follow-up for my last power sequence framework patch set [1].
> > According to Rob Herring and Ulf Hansson's comments[2]. The kinds of
> > power sequence instances will be added at postcore_initcall, the match
> > criteria is compatible string first, if the compatible string is not
> > matched between dts and library, it will try to use generic power sequence.
> > 	 
> > The host driver just needs to call of_pwrseq_on/of_pwrseq_off
> > if only one power sequence instance is needed, for more power sequences
> > are used, using of_pwrseq_on_list/of_pwrseq_off_list instead (eg, USB hub driver).
> > 
> > In future, if there are special power sequence requirements, the special
> > power sequence library can be created.
> > 
> > This patch set is tested on i.mx6 sabresx evk using a dts change, I use
> > two hot-plug devices to simulate this use case, the related binding
> > change is updated at patch [1/6], The udoo board changes were tested
> > using my last power sequence patch set.[3]
> > 
> > Except for hard-wired MMC and USB devices, I find the USB ULPI PHY also
> > need to power on itself before it can be found by ULPI bus.
> > 
> > [1] http://www.spinics.net/lists/linux-usb/msg142755.html
> > [2] http://www.spinics.net/lists/linux-usb/msg143106.html
> > [3] http://www.spinics.net/lists/linux-usb/msg142815.html
> > 
> > Changes for v10:
> > - Improve the kernel-doc for power sequence core, including exported APIs and
> >   main structure. [Patch 2/8]
> > - Change Kconfig, and let the user choose power sequence. [Patch 2/8]
> > - Delete EXPORT_SYMBOL and change related APIs as local, these APIs do not
> >   be intended to export currently. [Patch 2/8]
> > - Selete POWER_SEQUENCE at USB core's Kconfig. [Patch 4/8]
> 
> Hi Peter,
> 
> It is great that you continued the work on this.
> 
> I saw (in some previous mails) your repo mentioned:
> https://git.kernel.org/cgit/linux/kernel/git/peter.chen/usb.git/
> Does it contain the recent version of this patchset?
> 
> I want to build on top of it fixes for usb3503 on Odroid U3 board.

Krzysztof, I put v10 patch set at branch: pwrseq-lib. 
It seems there are no more comments I will send my v11 patch set
after new year holiday.

-- 

Best Regards,
Peter Chen