linux-kernel - Re: [PATCH] DS1WM: decouple host IRQ and INTR active state settings.

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Message-ID: <74d0deb30802060635w4ff12f2dxdec15a26dc9722f1@mail.gmail.com>
Date:	Wed, 6 Feb 2008 15:35:14 +0100
From:	"pHilipp Zabel" <philipp.zabel@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Matt Reimer" <mreimer@...p.net>, linux-kernel@...r.kernel.org,
	johnpol@....mipt.ru, szabolcs.gyurko@....hu
Subject: Re: [PATCH] DS1WM: decouple host IRQ and INTR active state settings.

Hi Andrew,

On Feb 6, 2008 8:26 AM, Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Tue, 8 Jan 2008 09:21:55 +0100 "pHilipp Zabel" <philipp.zabel@...il.com> wrote:
>
> > On Jan 8, 2008 1:13 AM, Matt Reimer <mreimer@...p.net> wrote:
> > > On Mon, 2008-01-07 at 15:10 -0800, Andrew Morton wrote:
> > > > On Sun, 06 Jan 2008 14:46:14 +0100
> > > > Philipp Zabel <philipp.zabel@...il.com> wrote:
> > > >
> > > > > The DS1WM driver incorrectly infers the IAS bit (1-wire interrupt active
> > > > > high) from IRQ settings. There are devices that have IAS=0 but still need
> > > > > the IRQ to trigger on a rising edge. With this patch, machines with DS1WM
> > > > > that need IAS=1 have to set .active_high=1 in the ds1wm_platform_data.
> > >
> > > > But no drivers are converted to set ds1wm_platform_data.active_high.  Won't
> > > > IORESOURCE_IRQ_HIGHEDGE devices be broken by this change?
> > >
> > > Good point; I think you're right. I'd guess the other platforms that use
> > > this driver are in the handhelds.org tree, but I've been out of the loop
> > > a while. Philipp, is this the case?
> >
> > Yes, I think so. I am only aware of four chips that include a DS1WM:
> > HTC's ASIC3, PASIC2 and PASIC3 and Samsung SAMCOP.
> > All of those drivers have yet to be submitted.
> >
> > I will also apply this patch to hh.org CVS and fix up the devices that are
> > affected by this change (aximx30, blueangel, magician, h1900, h4000,
> > h5400, himalaya, hx4700, sable, universal).
> > But none of those set IORESOURCE_IRQ_HIGHEDGE (most are just
> > missing the IORESOURCE_IRQ_LOWEDGE flag). I am not sure about
> > the status of rx3000 or other devices that might live in other trees.
> >
> > I'm currently cleaning up the PASIC2/3 driver. After that I'll try to help
> > cleaning up ASIC3 and finally getting it ready for submission.
> > A whole load of devices in the hh.org tree depend on it.
> >
>
> Guys, I'm thinking that by the time we actually need this patch in the
> mainline tree, it may well be obsolete.  So I should drop the copy I have?

I obviously think it should be applied.
But if you prefer that I resend once it is actually needed by
something in the tree, I'll happily do that, too.
The PASIC2/3 mfd driver is currently waiting for something like Dmitry
Baryshkov's clocklib patches to go in.

regards
Philipp
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