linux-kernel - Re: [PATCH V5 2/3] dt-bindings: interrupt-controller: C-SKY APB intc

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Date:   Mon, 17 Sep 2018 07:23:36 -0700
From:   Rob Herring <robh@...nel.org>
To:     Guo Ren <ren_guo@...ky.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH V5 2/3] dt-bindings: interrupt-controller: C-SKY APB intc

On Mon, Sep 17, 2018 at 1:36 AM Guo Ren <ren_guo@...ky.com> wrote:
>
> On Mon, Sep 17, 2018 at 02:23:36AM -0400, Rob Herring wrote:
> > On Sun, Sep 16, 2018 at 04:50:03PM +0800, Guo Ren wrote:
> > > Signed-off-by: Guo Ren <ren_guo@...ky.com>
> >
> > Needs a commit description.
> >
> > > ---
> > >  .../interrupt-controller/csky,apb-intc.txt         | 70 ++++++++++++++++++++++
> > >  1 file changed, 70 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt
> > > new file mode 100644
> > > index 0000000..be7c3d1
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt
> > > @@ -0,0 +1,70 @@
> > > +==============================
> > > +C-SKY APB Interrupt Controller
> > > +==============================
> > > +
> > > +C-SKY APB Interrupt Controller is a simple soc interrupt controller
> > > +on the apb bus and we only use it as root irq controller.
> > > +
> > > + - csky,apb-intc is used in a lot of csky fpgas and socs, it support 64 irq nums.
> > > + - csky,dual-apb-intc consists of 2 apb-intc and 128 irq nums supported.
> > > + - csky,gx6605s-intc is gx6605s soc internal irq interrupt controller, 64 irq nums.
> >
> > Is there a relationship between csky,gx6605s-intc and csky,apb-intc?
> They all use pending register to get irq num and use enable register to
> mask/unmask.
>
> > > +        - support-pulse-signal:
> > > +                Usage: select
> > > +           Description: to support pulse signal flag
> >
> > What is this for?
> This is a level-triger interrupt controller at first, but we want it
> to support pulse signal. It means that when the pulse signal coming,
> the pending register will hold signals without clear the IFR reg.
>
> Some C-SKY cpu's socs need this feature to support pulse interrupt
> signal.

So an edge triggered interrupt. We have a way to support that on a per
interrupt basis with a 2nd cell (which you should consider if you may
need anyways). But this is a global setting for all interrupts the
interrupt controller serves? If so, it's fine, but does need a vendor
prefix.

Rob