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

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Message-ID: <5773443.uubaG3Evxs@wuerfel>
Date:	Wed, 16 Jul 2014 13:32:44 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	Jassi Brar <jaswinder.singh@...aro.org>,
	"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 Wednesday 16 July 2014 12:16:50 Sudeep Holla wrote:
> 
> Agreed if these mbox-names are more specific to attached devices and that
> was my initial understanding too. But I got confused when I saw something
> like below in the patch[1]
> 
> +       mhu: mhu0@...f0000 {
> +               #mbox-cells = <1>;
> +               compatible = "fujitsu,mhu";
> +               reg = <0 0x2B1F0000 0x1000>;
> +               interrupts = <0 36 4>, /* LP Non-Sec */
> +                            <0 35 4>, /* HP Non-Sec */
> +                            <0 37 4>; /* Secure */
> +       };
> +
> +       mhu_client: scb@0 {
> +               compatible = "fujitsu,scb";
> +               mbox = <&mhu 1>;
> +               mbox-names = "HP_NonSec";
> +       };
> 
> Here the name used is more controller specific.

The name is definitely specific to the client, not the master. The
string "HP_NonSec" should be required in the binding for the "fujitsu,scb"
device here, and the scb driver should pass that hardcoded string
to the mailbox API to ask for a channel.

	Arnd
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