linux-kernel - Re: [PATCH v6 2/8] power: add power sequence library

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Date:   Tue, 23 Aug 2016 09:25:25 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Sebastian Reichel <sre@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Peter Chen <peter.chen@....com>, gregkh@...uxfoundation.org,
        ulf.hansson@...aro.org, broonie@...nel.org,
        stern@...land.harvard.edu, robh+dt@...nel.org, shawnguo@...nel.org,
        dbaryshkov@...il.com, dwmw3@...radead.org, k.kozlowski@...sung.com,
        linux-arm-kernel@...ts.infradead.org, p.zabel@...gutronix.de,
        devicetree@...r.kernel.org, pawel.moll@....com,
        mark.rutland@....com, linux-usb@...r.kernel.org, arnd@...db.de,
        s.hauer@...gutronix.de, mail@...iej.szmigiero.name,
        troy.kisky@...ndarydevices.com, festevam@...il.com,
        oscar@...andei.net, stephen.boyd@...aro.org,
        linux-pm@...r.kernel.org, stillcompiling@...il.com,
        linux-kernel@...r.kernel.org, mka@...omium.org
Subject: Re: [PATCH v6 2/8] power: add power sequence library

On Mon, Aug 22, 2016 at 12:23:31PM +0200, Sebastian Reichel wrote:
> Hi Peter,
> 
> On Mon, Aug 22, 2016 at 02:51:58PM +0800, Peter Chen wrote:
> > On Mon, Aug 15, 2016 at 05:13:12PM +0800, Peter Chen wrote:
> > > We have an well-known problem that the device needs to do some power
> > > sequence before it can be recognized by related host, the typical
> > > example like hard-wired mmc devices and usb devices.
> > > 
> > > This power sequence is hard to be described at device tree and handled by
> > > related host driver, so we have created a common power sequence
> > > library to cover this requirement. The core code has supplied
> > > some common helpers for host driver, and individual power sequence
> > > libraries handle kinds of power sequence for devices.
> > > 
> > > pwrseq_generic is intended for general purpose of power sequence, which
> > > handles gpios and clocks currently, and can cover regulator and pinctrl
> > > in future. The host driver calls pwrseq_alloc_generic to create
> > > an generic pwrseq instance.
> > > 
> > > Signed-off-by: Peter Chen <peter.chen@....com>
> > > Tested-by Joshua Clayton <stillcompiling@...il.com>
> > > Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
> > > Tested-by: Matthias Kaehlcke <mka@...omium.org>
> > 
> > Hi Greg, Sebastian, Dmitry, and David
> > 
> > I find the code under drivers/power have several subsystems.
> > Does this power sequence patch set can go git://git.infradead.org/battery-2.6.git?
> > Or can go the Greg's tree?
> 
> I think this does not really fit into the power-supply tree.
> I would expect this to go through Rafael's linux-pm tree.

Ok, thanks. Rafael, would you agree with that? If you agree, I will
update MAINTAINER file.

> 
> Note: I moved all the power-supply code into drivers/power/supply/
> in linux-next, among other things because of this patchset. To avoid
> merge conflicts in drivers/power/Makefile and drivers/power/Kconfig
> the tree pulling this patchset should also pull a (yet to be
> created) immutable branch containing
> https://git.kernel.org/cgit/linux/kernel/git/sre/linux-power-supply.git/commit/drivers/power?h=for-next&id=8c0984e5a75337df513047ec92a6c09d78e3e5cd
> 

Yes, I found the rebase conflict with it, I will fix it at next
revision.

-- 

Best Regards,
Peter Chen