linux-kernel - Re: [PATCH] irqchip: gic: Allow interrupt level to be set for PPIs.

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Message-ID: <20141201104612.GM828@e106497-lin.cambridge.arm.com>
Date:	Mon, 1 Dec 2014 10:46:13 +0000
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] irqchip: gic: Allow interrupt level to be set for PPIs.

On Mon, Dec 01, 2014 at 10:41:45AM +0000, Russell King - ARM Linux wrote:
> On Fri, Nov 28, 2014 at 05:55:40PM +0000, Liviu Dudau wrote:
> > +	/*
> > +	 * PPIs are optionally configurable, but we cannot distinguish
> > +	 * between high and low, nor falling and rising. Change the
> > +	 * type so that it passes the next check.
> 
> This comment could do with a /lot/ of improvement.  It sounds like the
> only reason this code exists is to bypass the check.  If that's all
> that's being done, there's better ways to code it.

Hi Russell,

You are right, all I want to do is bypass the next check because *if*
the PPIs can be configured, then any combination is valid (edge 
raising/falling, level low/high). In real systems, PPIs tend to be
configured with active level low. That falls the existing check.

If I understood more your thoughts on improving the comment then I can
try to come up with a better version.

Best regards,
Liviu

> 
> -- 
> FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up
> according to speedtest.net.
> 

-- 
====================
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| but they're not |
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