linux-kernel - Re: [PATCH 20/51] Input: atmel_mxt_ts - Set default irqflags when there is no pdata

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Message-ID: <20140526052320.GA12890@core.coreip.homeip.net>
Date:	Sun, 25 May 2014 22:23:20 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Yufeng Shen <miletus@...omium.org>
Cc:	Nick Dyer <nick.dyer@...ev.co.uk>,
	Benson Leung <bleung@...omium.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Alan Bowens <Alan.Bowens@...el.com>,
	linux-input <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Meerwald <pmeerw@...erw.net>,
	Olof Johansson <olofj@...omium.org>
Subject: Re: [PATCH 20/51] Input: atmel_mxt_ts - Set default irqflags when
 there is no pdata

On Fri, May 23, 2014 at 12:37:46PM -0400, Yufeng Shen wrote:
> On Thu, May 22, 2014 at 10:29 AM, Nick Dyer <nick.dyer@...ev.co.uk> wrote:
> >
> > Dmitry Torokhov wrote:
> > > On Thu, Jul 18, 2013 at 07:17:44PM +0200, rydberg@...omail.se wrote:
> > >>> From: Yufeng Shen <miletus@...omium.org>
> > >>> This is the preparation for supporting the code path when there is
> > >>> platform data provided and still boot the device into a sane state
> > >>> with backup NVRAM config.
> > >>>
> > >>> Make the irqflags default to be IRQF_TRIGGER_FALLING if no platform data is
> > >>> provided.
> > >
> > > I think if there is no platform data we should use 0 as IRQ falgs and
> > > assume that IRQ line is properly configured by the board code or via
> > > device tree.
> >
> > Beson/Yufeng - do you still have a requirement to probe without platform
> > data or device tree? I'm just merging in some changes to add device tree
> > support, and it would simplify things a bit if I can drop this patch.
> 
> 
> It has been working for quite a while for boards/devices that don't
> provide platform
> data. If we drop the default IRQ flags, sure we can add code for each
> board to configure
> the IRQ separately, but that's just adding extra work. Is there strong
> reason why we
> should not do the default setting in the driver if it is not already
> configured in platform
> data ?


I am not saying that board code needs to add platform data. I am saying
that the board code needs to set up interrupt properly (via
irq_set_irq_type() or similar) and then the driver can use 0 as irqflags
argument in request_irq() in absence of DT/platform data.

Thanks.

-- 
Dmitry
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