linux-kernel - Re: [PATCH v2 1/3] Input: gpio-keys - add support for wakeup event action

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Date:   Fri, 02 Mar 2018 11:57:21 +0800
From:   JeffyChen <jeffy.chen@...k-chips.com>
To:     Brian Norris <briannorris@...omium.org>
CC:     linux-kernel@...r.kernel.org, briannorris@...gle.com,
        dtor@...gle.com, dianders@...gle.com,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joseph Lo <josephl@...dia.com>,
        stephen lu <lumotuwe@...il.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        linux-input@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Arvind Yadav <arvind.yadav.cs@...il.com>
Subject: Re: [PATCH v2 1/3] Input: gpio-keys - add support for wakeup event
 action

Hi Brain,

Thanks for your reply.

On 03/02/2018 10:32 AM, Brian Norris wrote:
>>> > >What about the 'else' case? Shouldn't we try to handle that?
>> >i think the else case is for irq key, which would generate down and up
>> >events in one irq, so it would use the same trigger type for all these 3
>> >cases.
> Not necessarily. It uses whatever trigger was provided in
> platform/DT/etc. data. You could retrieve that with
> irq_get_trigger_type() and try to interpret that. Or you could just
> outlaw using that combination (e.g., in the binding documentation).
i think for the IRQ button case the assert/deassert/any are using the 
same irq trigger type, so it should be ok to leave the wakeup trigger 
type to be 0(not reconfigure the trigger type)...

i've made a v3 to add a comment about that, but forgot to send it :(

>
> Brian
>