linux-kernel - Re: [PATCH 07/12] Documentation: dt: imx: add MSCM documentation

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Message-ID: <b1d6e3afefac65c6424040c08689b750@agner.ch>
Date:	Wed, 03 Dec 2014 18:49:13 +0100
From:	Stefan Agner <stefan@...er.ch>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, shawn.guo@...aro.org,
	kernel@...gutronix.de, linux@....linux.org.uk,
	u.kleine-koenig@...gutronix.de, jason@...edaemon.net,
	olof@...om.net, daniel.lezcano@...aro.org, tglx@...utronix.de,
	mark.rutland@....com, pawel.moll@....com, robh+dt@...nel.org,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/12] Documentation: dt: imx: add MSCM documentation

On 2014-12-03 11:52, Arnd Bergmann wrote:
> On Wednesday 03 December 2014 01:12:06 Stefan Agner wrote:
>> +Freescale Vybrid Miscellaneous System Control Module
>> +
>> +The MSCM IP contains Access Control and TrustZone Security hardware,
>> +CPU Configuration registers and Interrupt Router control.
>> +
>> +Required properties:
>> +- compatible : "fsl,vf610-mscm"
>> +- reg : the register range of the MSCM module
>> +
>> +Example:
>> +       mscm: mscm@...01000 {
>> +               compatible = "fsl,vf610-mscm";
>> +               reg = <0x40001000 0x1000>;
>> +       };
> 
> This sounds like one of those generic system controller devices.
> Should this be marked as syscon an accessed through
> syscon_regmap_lookup_by_phandle()?
> 
> If you only eve have one driver touching these registers, that
> won't be necessary of course.
> 

So far, in upstream code the module is not used at all (other than in
U-Boot setting up the interrupt router in a static manner). I think it
is not that "miscellaneous" as it sounds, it mainly controls and
provides information regarding the dual-core stuff, for instance provide
interrupt flags for the CPU-to-CPU interrupts or exports CPU information
(beside the interrupt routing thing). I don't know (yet) if and how we
want export support for that interrupt. We would certainly need it to
support some message based framework (Freescale used it for their
out-of-tree MCC (multi-core communication) stuff, probably we would need
it to implement rpmsg support...).

--
Stefan

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