linux-kernel - Re: [RFC v4 01/14] regulator: of: Add helper for getting all supplies

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Date:	Thu, 9 Jun 2016 14:50:26 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Heiko Stuebner <heiko@...ech.de>, linux-mmc@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-samsung-soc@...r.kernel.org,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"open list:ULTRA-WIDEBAND (UWB) SUBSYSTEM:" 
	<linux-usb@...r.kernel.org>,
	"open list:FRAMEBUFFER LAYER" <linux-fbdev@...r.kernel.org>,
	Peter Chen <hzpeterchen@...il.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [RFC v4 01/14] regulator: of: Add helper for getting all supplies

On Thu, Jun 9, 2016 at 12:29 PM, Mark Brown <broonie@...nel.org> wrote:
> On Thu, Jun 09, 2016 at 11:44:18AM +0200, Krzysztof Kozlowski wrote:
>> Few drivers have a need of getting regulator supplies without knowing
>> their names:
>> 1. The Simple Framebuffer driver works on setup provided by bootloader
>>    (outside of scope of kernel);
>> 2. Generic power sequence driver may be attached to any device node.
>>
>> Add a Device Tree helper for parsing "-supply" properties and returning
>> allocated bulk regulator consumers.
>
> I'm still very concerned that this is just an invitation to people to
> write half baked regulator consumers and half baked DTs to go along with
> it, making it a standard API that doesn't have big red flags on it that
> will flag up when "normal" drivers use it is not good.  Right now this
> just looks like a standard API and people are going to just start using
> it.  If we are going to do this perhaps we need a separate header or
> something to help flag this up.
>
> In the case of power sequences I'd expect the sequences to perform
> operations on named supplies - the core shouldn't know what the supplies
> are but the thing specifying the sequence should.
>
>>  drivers/regulator/of_regulator.c       | 86 ++++++++++++++++++++++++++++++++++
>>  include/linux/regulator/of_regulator.h | 13 +++++
>>  2 files changed, 99 insertions(+)
>
> The external interface shouldn't be DT specific, the Intel people are
> busy importing all of DT into ACPI

Well, not really.

If you are referring to the pinctrl proposal discussed recently, that
was a proposal from one group at Intel and AFAICS it has been
abandoned.

> so they'll doubtless want an ACPI version.

That is possible, though, so I agree that the external interface
should not be DT-specific.