linux-kernel - Re: [PATCH v8 21/21] arm64: ACPI: additions of ACPI documentation for arm64

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Date:	Wed, 04 Feb 2015 12:06:14 -0700
From:	Al Stone <al.stone@...aro.org>
To:	Mark Brown <broonie@...nel.org>
CC:	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Will Deacon <will.deacon@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Jon Masters <jcm@...hat.com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles.Garcia-Tobin@....com, phoenix.liyi@...wei.com,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	suravee.suthikulpanit@....com,
	Mark Langsdorf <mlangsdo@...hat.com>, wangyijing@...wei.com,
	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org
Subject: Re: [PATCH v8 21/21] arm64: ACPI: additions of ACPI documentation
 for arm64

On 02/04/2015 11:12 AM, Mark Brown wrote:
> On Tue, Feb 03, 2015 at 05:40:20PM -0700, Al Stone wrote:
>> Much removed to cut down the size on this and to highlight a couple of
>> specific sections pertinent to the ACPI on ARMv8 TODO List.....
> 
> This is of course good practice when replying to anything!

Yup :).

>>> +_DSD	6.2.5		To be used with caution.  If this object is used, try +
>>> to use it within the constraints already defined by the +			Device
>>> Properties UUID.  Only in rare circumstances +			should it be necessary
>>> to create a new _DSD UUID. + +			In either case, submit the _DSD
>>> definition along with +			any driver patches for discussion, especially
>>> when +			device properties are used.  A driver will not be +
>>> considered complete without a corresponding _DSD +			description.  Once
>>> approved by kernel maintainers, +			the UUID or device properties must
>>> then be registered +			with the UEFI Forum; this may cause some
>>> iteration as +			more than one OS will be registering entries.
> 
>> [snip...]
> 
>> So, this is my attempt to encapsulate what I think people want to have
>> happen around the use of _DSD; I just want to make sure I point it out so
>> it doesn't inadvertently get lost somehow.
> 
>> Is this far too little?  Is it sufficient?  If it only addresses part of
>> the concerns, what did I miss?
> 
> This does take us back to the issue of how exactly one is supposed to 
> register/approve _DSD bindings and what format they're written in which I
> don't think we ever fully got to the bottom of it (there's some stuff on
> the UEFI website but it's definitely looking a bit placeholderish).

Right; the UEFI stuff is indeed place-holder-ish.  This is one of the places
where Linux is really driving what happens in the spec, so it's a little bit
of a chicken-and-egg problem.  I will go repair the UEFI data once I have
a better understanding of what's needed.

I guess what I'm trying to figure out is: how specific does this need to be?
Does it need to be a step-by-step description, something like
Documentation/bindings/submitting-patches.txt, or something far more detailed
than that, with templates to fill out, and circles and arrows and a paragraph
on the back explaining each one [0] :)?


[0] http://en.wikipedia.org/wiki/Alice%27s_Restaurant

-- 
ciao,
al
-----------------------------------
Al Stone
Software Engineer
Linaro Enterprise Group
al.stone@...aro.org
-----------------------------------
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