linux-kernel - Re: [PATCH 1/2] Input: atmel_mxt_ts - Get IRQ edge/level flags on DT booting

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Message-ID: <53E36F25.4030501@itdev.co.uk>
Date:	Thu, 07 Aug 2014 13:20:53 +0100
From:	Nick Dyer <nick.dyer@...ev.co.uk>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Stephen Warren <swarren@...dia.com>,
	Yufeng Shen <miletus@...omium.org>,
	Benson Leung <bleung@...omium.org>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>, linux-input@...r.kernel.org,
	devicetree@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Input: atmel_mxt_ts - Get IRQ edge/level flags on
 DT booting

On 07/08/14 01:48, Javier Martinez Canillas wrote:
> The Atmel maXTouch driver assumed that the IRQ type flags will
> always be passed using platform data but this is not true when
> booting using Device Trees. In these setups the interrupt type
> was ignored by the driver when requesting an IRQ.
> 
> This means that it will fail if a machine specified other type
> than IRQ_TYPE_NONE. The right approach is to get the IRQ flags
> that was parsed by OF from the "interrupt" Device Tree propery.

I do not believe you are correct about this. There is a bit of code here:
http://lxr.free-electrons.com/source/kernel/irq/manage.c?v=3.16#L1172
which means that in the device tree case, if we call request_threaded_irq()
with no trigger bits set, it will trust whatever it already there. I did
test this back in July and it appeared to work correctly.

Have you tested this change is actually necessary?
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