linux-kernel - Re: [PATCH v4 0/3] Add Mediatek CIRQ interrupt controller

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Date:   Fri, 7 Apr 2017 17:54:44 +0800
From:   Youlin Pei <youlin.pei@...iatek.com>
To:     Marc Zyngier <marc.zyngier@....com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Jason Cooper" <jason@...edaemon.net>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <hongkun.cao@...iatek.com>,
        <yong.wu@...iatek.com>, <erin.lo@...iatek.com>
Subject: Re: [PATCH v4 0/3] Add Mediatek CIRQ interrupt controller

On Fri, 2017-04-07 at 09:52 +0100, Marc Zyngier wrote:
> On 07/04/17 09:06, Youlin Pei wrote:
> > In Mediatek SOCs, the CIRQ is a low power interrupt controller designed to
> > works outside MCUSYS which comprises with Cortex-Ax cores,CCI and GIC.
> > 
> > The CIRQ controller is integrated in between MCUSYS and interrupt sources
> > as the second level interrupt controller. The external interrupts which 
> > outside MCUSYS will feed through CIRQ then bypass to GIC.
> > 
> > In normal mode(where MCUSYS is active), CIRQ is disabled and interrupts
> > will directly issue to MCUSYS. When MCUSYS enters sleep mode, where GIC
> > is power downed. CIRQ will be enabled and monitor all edge trigger
> > interrupts(only edge trigger interrupts will be lost in this scenario).
> > When an edge interrupt is triggered, CIRQ will record the status and
> > generated a pulse signal to GIC when flush command is executed. 
> > 
> > With CIRQ, MCUSYS can be completely turned off to improve the system 
> > power consumption without losing interrupts.
> > 
> > change in v4:
> > 1. add some comment to explain CIRQ suspend callback.
> > 2. rebase on 4.11
> 
> Hi Youlin,
> 
> I'm happy to take the first two patches through the irq tree. How do we
> deal with the third one? It seems to me that it'd be better routed via
> armsoc.
> 
> Let me know what you and Matthias want to do.

Hi Marc,

Thanks for your review. I think that driver and dtsi can merged
separately.

Hi Matthias,
Could you help to review the dtsi patch?
Thanks a lot!

> 
> Thanks,
> 
> 	M.