linux-kernel - Re: [PATCH 0/3] GPIO support for BRCMSTB

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Message-ID: <CADtm3G7mKJ6b9Koy0DeTAVUeJyhS9Lw+AzEvKf-xmFXTmAuG2w@mail.gmail.com>
Date:	Tue, 2 Jun 2015 21:13:19 -0700
From:	Gregory Fong <gregory.0xf0@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	Brian Norris <computersforpeace@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH 0/3] GPIO support for BRCMSTB

On Tue, Jun 2, 2015 at 2:05 AM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Wed, May 27, 2015 at 5:26 AM, Gregory Fong <gregory.0xf0@...il.com> wrote:
>> I've now actually attempted to use the gpiolib irqchip code.  This
>> driver can't directly use gpiochip_irqchip_add() because of the
>> multiple gpiochip : one irqchip map.  At first, I thought it might be
>> possible to simply add a new argument (or break things into a helper
>> function) to allow setting the associated IRQ domain, but then I can't
>> use the generic map and unmap functions which expect the irq_domain
>> host_data member to be struct gpiochip *, which makes no sense in this
>> case.  That puts me right back to implementing a special version of
>> the map and unmap function.
>
> I see.
>

I think I was wrong, it isn't actually necessary to have a single
irq_chip as long as all of the IRQs use the same handler.  I have a
preliminary implementation doing that instead that seems to work fine.
Once I've had a chance to verify that it works in all cases, will post
that as v3.

Cheers,
Gregory
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