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

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Date:   Mon, 22 Aug 2016 12:23:31 +0200
From:   Sebastian Reichel <sre@...nel.org>
To:     Peter Chen <hzpeterchen@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     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

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.

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

-- Sebastian

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