linux-kernel - Re: [PATCH] [RFC] Using hierarchy irqdomian to implement MTK intpol.

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Message-Id: <201409252120.24570.arnd@arndb.de>
Date:	Thu, 25 Sep 2014 21:20:24 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"Joe.C" <srv_yingjoe.chen@...iatek.com>,
	Mark Rutland <mark.rutland@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Russell King <linux@....linux.org.uk>, yingjoe.chen@...il.com,
	yh.chen@...iatek.com, nathan.chung@...iatek.com,
	Grant Likely <grant.likely@...aro.org>,
	"Joe.C" <yingjoe.chen@...iatek.com>, devicetree@...r.kernel.org,
	Jason Cooper <jason@...edaemon.net>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Marc Zyngier <marc.zyngier@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	eddie.huang@...iatek.com, srv_heupstream@...iatek.com,
	hc.yen@...iatek.com, linux-kernel@...r.kernel.org,
	Sascha Hauer <kernel@...gutronix.de>,
	Kumar Gala <galak@...eaurora.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>
Subject: Re: [PATCH] [RFC] Using hierarchy irqdomian to implement MTK intpol.

On Thursday 25 September 2014, Thomas Gleixner wrote:
> On Thu, 25 Sep 2014, Joe.C wrote:
> > From: "Joe.C" <yingjoe.chen@...iatek.com>
> > 
> > Here's the first draft of using hierarchy irqdomain to implement MTK intpol
> > support. I have tested it and intpol works fine. Before continue, I'd like
> > to get your comments. This is based on Jiang's hierarchy irqdomian [1] and
> > my mediatek SoC basic support [2].
> > 
> > Simplified block diagram for interrupt:
> > 
> >     ---------      ---------
> >  ---| CIRQ  |------|ARM GIC|
> >  ---|       |------|       |
> >  ---|       |------|       |
> >  ---|       |------|       |
> >  ---|       |------|       |
> >     ---------      ---------
> >  
> > In device tree, interrupt-parent for other devices is cirq, child of gic.
> > This describe HW better and allow device to specify polarity as it is sent
> > by the device. I'm using interrupt-parent to specify irq domain parent in
> > cirq now. Maybe adding another name like 'interrupt-domain-parent' will be
> > better.
> 
> I leave that to the DT folks.

interrupt-parent really defines a domain already, I think using this is
perfectly fine.


	Arnd
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