From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lee Jones <lee.jones@linaro.org>
Subject: Re: [PATCH v3 2/3] mfd: lubbock_io: add lubbock_io board
Date: Wed, 21 Jan 2015 15:10:52 +0000
Message-ID: <20150121151052.GD22024@x1>
References: <20150121123551.GD9258@x1>
 <332399927.402665086.1421847419490.JavaMail.root@zimbra1-e1.priv.proxad.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: QUOTED-PRINTABLE
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <332399927.402665086.1421847419490.JavaMail.root@zimbra1-e1.priv.proxad.net>
Sender: linux-kernel-owner@vger.kernel.org
To: robert.jarzmik@free.fr
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>, Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org, Samuel Ortiz <sameo@linux.intel.com>, Pawel Moll <pawel.moll@arm.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>, linux-kernel@vger.kernel.org, Haojian Zhuang <haojian.zhuang@gmail.com>, Rob Herring <robh+dt@kernel.org>, Arnd Bergmann <arnd@arndb.de>, linux-arm-kernel@lists.infradead.org, Kumar Gala <galak@codeaurora.org>, Daniel Mack <daniel@zonque.org>
List-Id: devicetree@vger.kernel.org

On Wed, 21 Jan 2015, robert.jarzmik@free.fr wrote:

> > ----- Mail original -----
> > De: "Lee Jones" <lee.jones@linaro.org>
> First of all, this is my web mail interface, so please be kind with
> my mail formatting ...

I have no idea what you want me to change or do differently?

Perhaps it might be more prudent for you to switch to a quality
mailer?

> > Looking at one of the other patches in the series it appears the fl=
ag
> > you're trying to capture is IORESOURCE_IRQ_LOWEDGE.  When I grep fo=
r
> > where this is being _used_ (think 'consumed, rather than passed.  I
> > only see a single entry in drivers/pnp/interface.c.
> Look at this call chain :
> request_irq()
>   setup_irq()
>     __setup_irq()
>       __irq_set_trigger()
>         pxa_gpio_irq_type() (aka. chip->irq_set_type)
>           =3D> hardware register manipulation
>=20
> Moreover, you should be aware of the bijection existing between :
>  - IORESOURCE_IRQ_LOWEDGE and IRQF_TRIGGER_RISING
>  - it's HIGHEDGE twin
>  - it is noted in : include/linux/interrupt.h
>=20
> > That's what got me thinking... are you sure you're a) making use of
> this flag
> Yes, I'm quite sure.
>=20
> > b) assuming the answer to 'a' is "no"
> I won't :)
>=20
> > I think to set an edge trigger on an IRQ, you should instead do so =
via
> > irq_set_irq_type(), or have a missed a line or two?
> __setup_irq(), that's the entry point.

Very well, Russell and yourself have convinced me.  If you fixup the
remainder of comments, I'm happy.

--=20
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org =E2=94=82 Open source software for ARM SoCs
=46ollow Linaro: Facebook | Twitter | Blog