linux-kernel - Re: [PATCH v4 2/4] mailbox: Hi6220: add mailbox driver

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Message-ID: <20151016060809.GC3226@leoy-linaro>
Date:	Fri, 16 Oct 2015 14:08:09 +0800
From:	Leo Yan <leo.yan@...aro.org>
To:	Jassi Brar <jassisinghbrar@...il.com>
Cc:	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>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Bintian Wang <bintian.wang@...wei.com>,
	Yiping Xu <xuyiping@...ilicon.com>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Wei Xu <xuwei5@...ilicon.com>,
	Devicetree List <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>
Subject: Re: [PATCH v4 2/4] mailbox: Hi6220: add mailbox driver

On Fri, Oct 16, 2015 at 11:17:32AM +0530, Jassi Brar wrote:
> On Fri, Oct 16, 2015 at 10:59 AM, Leo Yan <leo.yan@...aro.org> wrote:
> > On Fri, Oct 16, 2015 at 10:43:00AM +0530, Jassi Brar wrote:
> >> On Mon, Oct 12, 2015 at 10:02 PM, Leo Yan <leo.yan@...aro.org> wrote:
> >>
> >> > +
> >> > +#define MBOX_CHAN_MAX                  32
> >> > +#define MBOX_CHAN_NUM                  2
> >> > +
> >> You mean the hardware has 32 channels but this driver can not manage
> >> more than 2 ?
> >>
> >> OR, there are 32 interfaces but only 2 physical 'floating' links, so
> >> no more than 2 interfaces can be active at any time?
> >
> > For the later case.
> Former is a s/w limitation and latter is h/w limitation. From what you
> write below, it seems former to be the case.

Sorry, i misunderstood the question. It's a s/w limitation.

> > Mailbox also can be used by other modules, such
> > like audio hifi; later need add links for them if want to enable
> > audio. But so far only uses first 2 channels.
> >
> You mean every time your platform needs another channel, you'll update
> the driver? Not sure about that. It should be simpler to assign which
> ever and as many channels as the client asks via DT.

For hi6220, every channel is fixed to specific purpose; so i can
register all of them in driver, such like hifi related channels;
Though i cannot test them currently, but this will avoid extra
efforts for enabling channels anymore, do you think this is okay?
Or you prefer to bind with DT?

Thanks,
Leo Yan
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