linux-kernel - Re: [PATCH 1/4] Document: DT: Add bindings for mediatek MT6797 SoC Platform

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Date:   Thu, 8 Sep 2016 22:08:55 +0800
From:   Mars Cheng <mars.cheng@...iatek.com>
To:     Marc Zyngier <marc.zyngier@....com>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "Michael Turquette" <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Erin Lo <erin.lo@...iatek.com>,
        James Liao <jamesjj.liao@...iatek.com>,
        <linux-clk@...r.kernel.org>, CC Hwang <cc.hwang@...iatek.com>,
        Loda Choui <loda.chou@...iatek.com>,
        Miles Chen <miles.chen@...iatek.com>,
        Scott Shu <scott.shu@...iatek.com>,
        Jades Shih <jades.shih@...iatek.com>,
        "Yingjoe Chen" <yingjoe.chen@...iatek.com>,
        My Chuang <my.chuang@...iatek.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>
Subject: Re: [PATCH 1/4] Document: DT: Add bindings for mediatek MT6797 SoC
 Platform

Hi Marc

Thanks for your review. the response inlined.

On Thu, 2016-09-08 at 13:37 +0100, Marc Zyngier wrote:
> On 08/09/16 11:49, Mars Cheng wrote:
> > This adds DT binding documentation for Mediatek MT6797.
> > 
> > Signed-off-by: Mars Cheng <mars.cheng@...iatek.com>
> > ---
[...]
> 
> > diff --git a/Documentation/devicetree/bindings/interrupt-controller/mediatek,sysirq.txt b/Documentation/devicetree/bindings/interrupt-controller/mediatek,sysirq.txt
> > index 9d1d72c..3d97eb4 100644
> > --- a/Documentation/devicetree/bindings/interrupt-controller/mediatek,sysirq.txt
> > +++ b/Documentation/devicetree/bindings/interrupt-controller/mediatek,sysirq.txt
> > @@ -8,6 +8,7 @@ Required properties:
> >  	"mediatek,mt8173-sysirq"
> >  	"mediatek,mt8135-sysirq"
> >  	"mediatek,mt8127-sysirq"
> > +	"mediatek,mt6797-sysirq"
> >  	"mediatek,mt6795-sysirq"
> >  	"mediatek,mt6755-sysirq"
> >  	"mediatek,mt6592-sysirq"
> > @@ -21,7 +22,8 @@ Required properties:
> >  - interrupt-parent: phandle of irq parent for sysirq. The parent must
> >    use the same interrupt-cells format as GIC.
> >  - reg: Physical base address of the intpol registers and length of memory
> > -  mapped region.
> > +  mapped region. Could be up to 2 registers here at max. Ex: 6797 needs 2 reg,
> > +  others need 1.
> 
> Two things:
> 
> - Please make this a separate patch that can be reviewed independently
> of the rest of the changes, which are just adding new compatible
> identifiers.

Will fix this in the next patch set.

> 
> - Why can't you simply expose it as a separate controller? Looking at
> the way you're changing the corresponding driver, it looks like you're
> simply adding an extra base/size. If you simply had a base for the
> corresponding GIC interrupts, you could handle as many region as you
> want, and have a more generic driver.
> 

May I know the meaning of "simply expose it as a separate controller"?
Or you might like to suggest me any similar driver as a reference? I
will examine it. Current design is based on the fact: We expect
irq-mtk-sysirq needs the optional second base but the third one will not
happen.

If we really need more than 2 bases, we can figure out a more generic
driver at the time, right?

Thanks.
> Thanks,
> 
> 	M.