linux-kernel - Re: [PATCH v7 0/8] power: add power sequence library

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Message-ID: <20160927235342.GA6165@b29397-desktop>
Date:   Wed, 28 Sep 2016 07:53:42 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
Cc:     Peter Chen <peter.chen@....com>, mark.rutland@....com,
        ulf.hansson@...aro.org, stephen.boyd@...aro.org,
        k.kozlowski@...sung.com, linux-kernel@...r.kernel.org,
        festevam@...il.com, stillcompiling@...il.com, pawel.moll@....com,
        dbaryshkov@...il.com, vaibhav.hiremath@...aro.org,
        mka@...omium.org, stern@...land.harvard.edu, dwmw3@...radead.org,
        devicetree@...r.kernel.org, arnd@...db.de,
        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,
        sre@...nel.org, broonie@...nel.org, p.zabel@...gutronix.de,
        shawnguo@...nel.org
Subject: Re: [PATCH v7 0/8] power: add power sequence library

On Wed, Sep 28, 2016 at 01:30:17AM +0200, Maciej S. Szmigiero wrote:
> On 20.09.2016 05:36, 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
> 
> Just tested this patch set on UDOO board again to make sure that it still
> works after all changes done since it was last tested there and can confirm
> that it does work correctly.
> 

Thanks, Maciej.

-- 

Best Regards,
Peter Chen