linux-kernel - Re: [PATCH v2 4/8] irqchip: devicetree: document Conexant Digicolor irq binding

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Date:	Sun, 11 Jan 2015 13:21:41 +0200
From:	Baruch Siach <baruch@...s.co.il>
To:	Mark Rutland <mark.rutland@....com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 4/8] irqchip: devicetree: document Conexant Digicolor
 irq binding

Hi Mark,

On Fri, Jan 09, 2015 at 11:50:14AM +0000, Mark Rutland wrote:
> On Thu, Jan 08, 2015 at 07:40:00PM +0000, Baruch Siach wrote:
> > Signed-off-by: Baruch Siach <baruch@...s.co.il>
> > ---
> >  .../bindings/interrupt-controller/digicolor-ic.txt   | 20 ++++++++++++++++++++
> >  1 file changed, 20 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/digicolor-ic.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/interrupt-controller/digicolor-ic.txt b/Documentation/devicetree/bindings/interrupt-controller/digicolor-ic.txt
> > new file mode 100644
> > index 000000000000..fdf9a4c59bf3
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/interrupt-controller/digicolor-ic.txt
> > @@ -0,0 +1,20 @@
> > +Conexant Digicolor Interrupt Controller
> > +
> > +Required properties:
> > +
> > +- compatible : should be "cnxt,cx92755-ic"
> 
> I didn't spot "cnxt" in
> Documentation/devicetree/bindings/vendor-prefixes.txt in mainline, nor
> did I spot it added as part of this series. Please add it, assuming a
> patch doing so is not already queued elsewhere.

I sent a vendor-prefixes.txt update earlier as part of the UART driver series. 
Greg has it queued in the tty-testing branch of his tty tree 
(https://git.kernel.org/cgit/linux/kernel/git/gregkh/tty.git/commit/?h=tty-testing&id=48c738631753186e0ec7dd0079beffb3a6f4bb5c).

> > +- reg : Specifies base physical address and size of the MISC area, that is
> > +  where the interrupt controller registers are located
> 
> Is this area shared with other devices?

Yes. The interrupt controller uses just a small area in this registers space 
(offsets 0x40 - 0x80). This trouble is that I also need access to the system 
global UC_IRQ_CONTROL register (offset 0x3a4), to configure interrupts channel 
and routing (IRQ/FIQ). I wonder whether register access via syscon is better.

> > +- interrupt-controller : Identifies the node as an interrupt controller
> > +- #interrupt-cells : Specifies the number of cells needed to encode an
> > +  interrupt source. The value shall be 1.
> 
> There is no configuration that can be applied to individual interrupt
> lines (e.g. trigger type)?

No. There is none.

baruch

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