linux-kernel - Re: [PATCHv5 2/4] mailbox: Introduce framework for mailbox

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Message-ID: <CAJe_ZheUpALkb9+8W_DNu=WGHMn0N+7Ctik6DNJZiARVsbR35Q@mail.gmail.com>
Date:	Thu, 5 Jun 2014 17:09:22 +0530
From:	Jassi Brar <jaswinder.singh@...aro.org>
To:	Matt Porter <mporter@...aro.org>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	lkml <linux-kernel@...r.kernel.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>,
	Rob Herring <robherring2@...il.com>,
	Josh Cartwright <joshc@...eaurora.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Kumar Gala <galak@...eaurora.org>,
	"ks.giri@...sung.com" <ks.giri@...sung.com>,
	Devicetree List <devicetree@...r.kernel.org>
Subject: Re: [PATCHv5 2/4] mailbox: Introduce framework for mailbox

On 5 June 2014 16:42, Matt Porter <mporter@...aro.org> wrote:
> On Tue, Jun 03, 2014 at 03:51:55PM +0530, Jassi Brar wrote:
>
>> BTW, here we at least have a hardware resource to specify in the DT
>> node, there are examples in kernel where the DT nodes are purely
>> virtual. For ex, grep for "linux,spdif-dit". So I think we should be
>> ok.
>>
>
> There's a bit of a difference between my concern over a virtual node and
> this example you've cited. In the dummy spdif transmitter, it's defining
> a virtual device that plugs in for a codec, a hardware concept well
> defined in the audio bindings. I agree that there are many examples of
> this type of virtual node, including dummy phys, but in all cases they
> are stubbing out a real hardware concept.
>
> I find it to be distinctly different to create a node that doesn't
> represent the hardware's use of mailboxes.
>
The way I see "cpm_ipc" is that it represents a device that doesn't
need MMIO or an IRQ, but only the mailbox hardware resource.
"linux,spdif-dit" needs no hardware resource at all. So if anything,
more "virtual" than cpm_ipc.

> I'd be happy if a DT
> maintainer could say that this is acceptable though. ;)
>
OK, though it becomes clear only after reading this ;)

Cheers
-Jassi
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