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

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Date:   Tue, 18 Sep 2018 17:56:50 -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 8:41 AM Guo Ren <ren_guo@...ky.com> wrote:
>
> On Mon, Sep 17, 2018 at 07:23:36AM -0700, Rob Herring wrote:
> > 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,
> Yes, it's a global setting for all interrupts. not really edge triggered
> interrupt for every interrupt.
>
> > but does need a vendor prefix.
> vendor prefix? Em ... it's just used in fpga now.

What I mean is make it: csky,support-pulse-signal

>
> Best Regards
>  Guo Ren