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Date:	Thu, 07 Aug 2014 03:47:24 +0200
From:	Javier Martinez Canillas <>
To:	Tomasz Figa <>,
	Dmitry Torokhov <>
CC:	Nick Dyer <>,
	Stephen Warren <>,
	Yufeng Shen <>,
	Benson Leung <>,
	Doug Anderson <>,
	Olof Johansson <>,,,,
Subject: Re: [PATCH 1/2] Input: atmel_mxt_ts - Get IRQ edge/level flags on
 DT booting

Hello Tomasz,

Thanks a lot for your feedback.

On 08/07/2014 03:14 AM, Tomasz Figa wrote:
> Hi Javier,
> Have you observed an actual failure due to this? I believe that

Yes, I found this issue since the driver was not taking into account the value
defined in the edge/level type cells from the "interrupts" DT property.

Only doing the change in the following patch was not enough:

[PATCH 1/1] ARM: dts: Add Peach Pit and Pi dts entry for atmel touchpad [0].

> irq_of_parse_and_map() already sets up IRQ trigger type based on DT
> data, by calling irq_create_of_mapping() which in turn calls
> irq_set_irq_type().

Right but somehow when the IRQ is actually requested the type is overwritten by
the value passed to request_threaded_irq() and interrupts are not being
generated by the device without this patch.

Do you think that this is a bug in the "interrupt-parent" irqchip driver or the
IRQ core? I'm not that familiar with the IRQ subsystem.

>> +	if (client->dev.of_node)
>> +		irqflags = irq_get_trigger_type(client->irq);
> It might be a bit cleaner to just assign the flags to pdata->irqflags in
> mxt_parse_dt() instead. That would also account for the fact that pdata,
> if provided, should have priority over DT.

You are totally right, also this will break if CONFIG_OF is not enabled since
dev.of_node will not be defined. While this already is taken into account for
mxt_parse_dt() by defining an empty function.

I'll change it in v2 if getting the flags from the driver is the right approach
instead of fixing the irqchip driver or the IRQ core.

> Best regards,
> Tomasz

Best regards,

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