linux-kernel - Re: [PATCH] input: eglx_ts, remove irq trigger flags

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Date:	Thu, 12 Mar 2015 09:28:13 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Markus Pargmann <mpa@...gutronix.de>
Cc:	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-kernel@...r.kernel.org, kernel@...gutronix.de,
	linux-input@...r.kernel.org
Subject: Re: [PATCH] input: eglx_ts, remove irq trigger flags

On Thu, Mar 12, 2015 at 04:37:01PM +0100, Markus Pargmann wrote:
> Hi,
> 
> On Thu, Mar 12, 2015 at 04:18:03PM +0100, Philipp Zabel wrote:
> > Hi Markus,
> > 
> > Am Donnerstag, den 12.03.2015, 15:50 +0100 schrieb Markus Pargmann:
> > > The trigger settings for a given irq are parsed from DT. Defining them
> > > as flag for devm_request_threaded_irq() overwrites these settings. This
> > > results in wrong trigger settings for boards which have different irq
> > > triggers.
> > > 
> > > Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
> > > ---
> > >  drivers/input/touchscreen/egalax_ts.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/input/touchscreen/egalax_ts.c b/drivers/input/touchscreen/egalax_ts.c
> > > index 4c56299284ef..b0e6448b743c 100644
> > > --- a/drivers/input/touchscreen/egalax_ts.c
> > > +++ b/drivers/input/touchscreen/egalax_ts.c
> > > @@ -218,7 +218,7 @@ static int egalax_ts_probe(struct i2c_client *client,
> > >  
> > >  	error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
> > >  					  egalax_ts_interrupt,
> > > -					  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> > > +					  IRQF_ONESHOT,
> > >  					  "egalax_ts", ts);
> > >  	if (error < 0) {
> > >  		dev_err(&client->dev, "Failed to register interrupt\n");
> > 
> > There are three device trees which have eeti,egalax_ts nodes with
> > interrupt flags 0:
> > 
> > arch/arm/boot/dts/imx53-tx53-x13x.dts (twice),
> > arch/arm/boot/dts/imx6dl-tx6u-811x.dts, and
> > arch/arm/boot/dts/imx6q-tx6q-1110.dts.
> > 
> > Will these still work after this change?
> 
> Oh right, thanks, these should be fixed as well.

If by fixing you mean changing DTS I do not think we can do that. Maybe
the driver should check if there is non-empty trigger flags in the
interrupt description and fall back to IRQF_TRIGGER_LOW if they are
absent.

Thanks.

-- 
Dmitry
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