From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Brezillon Subject: Re: [PATCH v2 2/5] irqchip: Add DT binding doc for dumb demuxer chips Date: Tue, 13 Jan 2015 21:52:07 +0100 Message-ID: <20150113215207.185d92b4@bbrezillon> References: <1421174781-4340-1-git-send-email-boris.brezillon@free-electrons.com> <1421174781-4340-3-git-send-email-boris.brezillon@free-electrons.com> <20150113190050.GZ24989@titan.lakedaemon.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20150113190050.GZ24989-u4khhh1J0LxI1Ri9qeTfzeTW4wlIGRCZ@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jason Cooper Cc: Thomas Gleixner , Nicolas Ferre , Jean-Christophe Plagniol-Villard , Alexandre Belloni , "Rafael J. Wysocki" , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org Hi Jason, On Tue, 13 Jan 2015 14:00:50 -0500 Jason Cooper wrote: > Boris, >=20 > On Tue, Jan 13, 2015 at 07:46:18PM +0100, Boris Brezillon wrote: > > Add documentation for the dumb demuxer. > >=20 > > Signed-off-by: Boris Brezillon > > --- > > .../bindings/interrupt-controller/dumb-demux.txt | 34 ++++++++++= ++++++++++++ > > 1 file changed, 34 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/interrupt-con= troller/dumb-demux.txt > >=20 > > diff --git a/Documentation/devicetree/bindings/interrupt-controller= /dumb-demux.txt b/Documentation/devicetree/bindings/interrupt-controlle= r/dumb-demux.txt > > new file mode 100644 > > index 0000000..1c777ef > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/interrupt-controller/dumb-d= emux.txt > > @@ -0,0 +1,34 @@ > > +* Generic Dumb Interrupt Demultiplexer > > + > > +This Dumb demultiplixer simply forward all incoming interrupts to = its > > +enabled/unmasked children. >=20 > Please forgive the potentially na=C3=AFve question, but what hardware= is this > describing? That's not a real hardware per se, but on some hardware (like at91 SoCs= ) some IRQ line are shared by several peripherals, and this dumb demultiplex is here to represent such shared irq lines which cannot be easily demultiplexed (because they do not provide a 'cause' register). You can see it as a virtual irqchip provided to address broken hardware designs. Regards, Boris --=20 Boris Brezillon, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe devicetree" i= n the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html