linux-kernel - Re: [PATCHv7 2/5] mailbox: Introduce framework for mailbox

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Message-ID: <7hzjha5ew2.fsf@paris.lan>
Date:	Wed, 18 Jun 2014 10:03:25 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Jassi Brar <jaswinder.singh@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Devicetree List <devicetree@...r.kernel.org>,
	Matt Porter <mporter@...aro.org>,
	Patch Tracking <patches@...aro.org>,
	Bjorn Andersson <bjorn@...o.se>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Anna\, Suman" <s-anna@...com>,
	Loic Pallardy <loic.pallardy@...com>,
	LeyFoon Tan <lftan.linux@...il.com>,
	Craig McGeachie <slapdau@...oo.com.au>,
	Courtney Cavin <courtney.cavin@...ymobile.com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	ijc+devicetree@...lion.org.uk, Arnd Bergmann <arnd@...db.de>,
	Josh Cartwright <joshc@...eaurora.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Kumar Gala <galak@...eaurora.org>,
	"ks.giri\@samsung.com" <ks.giri@...sung.com>
Subject: Re: [PATCHv7 2/5] mailbox: Introduce framework for mailbox

Jassi Brar <jaswinder.singh@...aro.org> writes:

> On 18 June 2014 05:57, Kevin Hilman <khilman@...aro.org> wrote:
>> Jassi Brar <jaswinder.singh@...aro.org> writes:
>>
>>> Introduce common framework for client/protocol drivers and
>>> controller drivers of Inter-Processor-Communication (IPC).
>>>
>>> Client driver developers should have a look at
>>>  include/linux/mailbox_client.h to understand the part of
>>> the API exposed to client drivers.
>>> Similarly controller driver developers should have a look
>>> at include/linux/mailbox_controller.h
>>>
>>> Signed-off-by: Jassi Brar <jaswinder.singh@...aro.org>
>>
>> This series is shaping up nicely.  The one thing I think it would
>> benefit from, being a new common framework is something under
>> Documentation giving a brief overview, but more importantly some
>> example code snippets of a mailbox client using the API, and maybe an
>> example usage of the controller API as well.
>>
>> Not only will that guide developers who want to use/implement this API
>> on their platforms, it will also aid reviewers.
>>
> I have been trying to get it upstream for quite some time now because
> my platform depends upon it. I am planning to submit my platform
> support which should have a client and controller side of the mailbox
> API. 

Having a reference implementation is great, but I don't think that
removes the need for a bit of Documentation when introducing a new
framework.  

It's pretty common to see new IPC mechanisms posted and being able to
point somone to this framework and something under Documentation/* would
be a great help in getting more users of the framework.

> Though I am told the API (until v4 at least) supported usecases for 5
> different platforms.

That's great.

I sure would like to see some more Reviewed-by tags from those folks to
confirm that those starting to use it think it's on the right track.

Kevin
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