linux-kernel - Re: [PATCHv8 2/2] mailbox: Introduce framework for mailbox

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Date:	Wed, 16 Jul 2014 18:07:04 +0530
From:	Jassi Brar <jaswinder.singh@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ks.giri@...sung.com" <ks.giri@...sung.com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Mark Rutland <Mark.Rutland@....com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"courtney.cavin@...ymobile.com" <courtney.cavin@...ymobile.com>,
	"mporter@...aro.org" <mporter@...aro.org>,
	"slapdau@...oo.com.au" <slapdau@...oo.com.au>,
	"lftan.linux@...il.com" <lftan.linux@...il.com>,
	"loic.pallardy@...com" <loic.pallardy@...com>,
	"s-anna@...com" <s-anna@...com>,
	"ashwin.chaugule@...aro.org" <ashwin.chaugule@...aro.org>,
	"bjorn@...o.se" <bjorn@...o.se>,
	"patches@...aro.org" <patches@...aro.org>,
	"Mollie.Wu@...fujitsu.com" <Mollie.Wu@...fujitsu.com>,
	"t.takinishi@...fujitsu.com" <t.takinishi@...fujitsu.com>
Subject: Re: [PATCHv8 2/2] mailbox: Introduce framework for mailbox

On 16 July 2014 15:46, Arnd Bergmann <arnd@...db.de> wrote:
> On Wednesday 16 July 2014 10:40:19 Sudeep Holla wrote:
>> > +
>> > +Required property:
>> > +- mbox: List of phandle and mailbox channel specifier.
>> > +
>> > +- mbox-names: List of identifier strings for each mailbox channel
>> > +               required by the client.
>> > +
>>
>> IMO the mailbox names are more associated with the controller channels/
>> mailbox rather than the clients using it. Does it make sense to move
>> this under controller. It also avoid each client replicating the names.
>
> I think it would be best to just make the mbox-names property optional,
> like we have for other subsystems.
>
A very similar subsystem - DMAEngine also has 'dma-names' as a
required property.

If a client is assigned only 1 mbox in DT, we can do without
mbox-names. But I am not sure what to do if a client needs two or more
differently capable mboxes? Simply allocating in order of mbox request
doesn't seem very robust.

-jassi
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