linux-kernel - Re: [PATCH v11 2/8] power: add power sequence library

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Message-ID: <CAJZ5v0h09A2XWLEk7v9XPe+4fP7HDr6AqZzBmvBi_V5nhLoiRw@mail.gmail.com>
Date:   Fri, 20 Jan 2017 11:21:27 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Peter Chen <hzpeterchen@...il.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Peter Chen <peter.chen@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Stephen Boyd <stephen.boyd@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Gary Bisson <gary.bisson@...ndarydevices.com>,
        Fabio Estevam <festevam@...il.com>,
        Joshua Clayton <stillcompiling@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        Vaibhav Hiremath <vaibhav.hiremath@...aro.org>,
        mka@...omium.org, Alan Stern <stern@...land.harvard.edu>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        mail@...iej.szmigiero.name, Pawel Moll <pawel.moll@....com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        troy.kisky@...ndarydevices.com, Rob Herring <robh+dt@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>, hverkuil@...all.nl,
        oscar@...andei.net,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:ULTRA-WIDEBAND (UWB) SUBSYSTEM:" 
        <linux-usb@...r.kernel.org>, Sebastian Reichel <sre@...nel.org>,
        Mark Brown <broonie@...nel.org>, p.zabel@...gutronix.de,
        Shawn Guo <shawnguo@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [PATCH v11 2/8] power: add power sequence library

On Fri, Jan 20, 2017 at 8:52 AM, Peter Chen <hzpeterchen@...il.com> wrote:
> On Tue, Jan 10, 2017 at 03:02:41PM +0800, Peter Chen wrote:
>> On Sat, Jan 07, 2017 at 10:54:56AM +0200, Krzysztof Kozlowski wrote:
>> > On Thu, Jan 05, 2017 at 02:01:53PM +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. The pwrseq
>> > > librares always need to allocate extra instance for compatible
>> > > string match.
>> > >
>> > > pwrseq_generic is intended for general purpose of power sequence, which
>> > > handles gpios and clocks currently, and can cover other controls in
>> > > future. The host driver just needs to call of_pwrseq_on/of_pwrseq_off
>> > > if only one power sequence is needed, else call of_pwrseq_on_list
>> > > /of_pwrseq_off_list instead (eg, USB hub driver).
>> > >
>> > > For new power sequence library, it can add its compatible string
>> > > to pwrseq_of_match_table, then the pwrseq core will match it with
>> > > DT's, and choose this library at runtime.
>> > >
>> > > Signed-off-by: Peter Chen <peter.chen@....com>
>> > > Tested-by: Maciej S. Szmigiero <mail@...iej.szmigiero.name>
>> > > Tested-by Joshua Clayton <stillcompiling@...il.com>
>> > > Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
>> > > Tested-by: Matthias Kaehlcke <mka@...omium.org>
>> >
>> > Acked-by: Krzysztof Kozlowski <krzk@...nel.org>
>> > Tested on Odroid U3 (reset sequence for LAN9730):
>> > Tested-by: Krzysztof Kozlowski <krzk@...nel.org>
>> >
>>
>> A nice ping...
>>
>
> Rafael, would you please review it? This series was discussed about
> half a year, and many people need it, I hope it can be in v4.11-rc1,
> thanks.

I'm travelling now
(http://marc.info/?l=linux-pm&m=148410629024194&w=2) and (as stated in
this message) I'll get to the patches when I'm back home.

There is a good chance for your code to go into 4.11-rc1 if the review
comments so far have been addressed.

Thanks,
Rafael