linux-kernel - Re: [PATCH 5/8] mfd: Provide the PRCMU with its own IRQ domain

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Message-ID: <20120820083640.GH8450@gmail.com>
Date:	Mon, 20 Aug 2012 09:36:43 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	STEricsson_nomadik_linux@...t.st.com, linus.walleij@...ricsson.com,
	broonie@...nsource.wolfsonmicro.com,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH 5/8] mfd: Provide the PRCMU with its own IRQ domain

On Tue, Aug 14, 2012 at 12:44:37PM +0200, Linus Walleij wrote:
> On Tue, Aug 14, 2012 at 11:42 AM, Arnd Bergmann <arnd@...db.de> wrote:
> > On Tuesday 14 August 2012, Linus Walleij wrote:
> >> On Thu, Aug 9, 2012 at 5:53 PM, Lee Jones <lee.jones@...aro.org> wrote:
> >>
> >> > +int db8500_irq_get_virq(int irq);
> >>
> >> And I'm sceptic about this business. Why isn't this physical-to virtual
> >> mapping business confined to the core MFD driver? But enlighten me.
> >
> > Traditionally, an MFD would add an offset to the local IRQ number
> > to put the VIRQ into the IRQ resource, but this doesn't work when
> > you have domains other than legacy.
> 
> Yes but I think I saw this other patch set from Lee, hitting
> irqdomain, OF and MFD to actually fix this ... or did I get
> it wrong?

No, you're not wrong.

Historically (in my patches) xb8500_irq_get_virq() was used by drivers
to obtain a VIRQ when not using Device Tree. Now the MFD core handles
conversion there is little requirement for it. In fact there are no
more users for db8500_irq_get_virq() and only one user for 
ab8500_irq_get_virq() and that's itself. I guess we can rid them and
call irq_get_mapping() directly instead.

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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