Re: [PATCH 1/2] Input: atmel_mxt_ts - Get IRQ edge/level flags on DT booting
From: Javier Martinez Canillas
Date: Wed Aug 06 2014 - 21:47:47 EST
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,
Javier
[0]: http://www.spinics.net/lists/kernel/msg1802099.html
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