linux-kernel - Re: [PATCH V3 22/26] dt-bindings: interrupt-controller: C-SKY SMP intc

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Message-ID: <CABGGiszOxskc_V1E8A4i34OWSUdOSVX-QSRrgG+NjTbashND_g@mail.gmail.com>
Date:   Wed, 5 Sep 2018 19:45:12 -0500
From:   Rob Herring <robh@...nel.org>
To:     ren_guo@...ky.com
Cc:     linux-arch@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jason Cooper <jason@...edaemon.net>,
        Arnd Bergmann <arnd@...db.de>, c-sky_gcc_upstream@...ky.com,
        gnu-csky@...tor.com, thomas.petazzoni@...tlin.com,
        wbx@...ibc-ng.org, Greentime Hu <green.hu@...il.com>
Subject: Re: [PATCH V3 22/26] dt-bindings: interrupt-controller: C-SKY SMP intc

On Wed, Sep 5, 2018 at 7:09 AM Guo Ren <ren_guo@...ky.com> wrote:
>
> Signed-off-by: Guo Ren <ren_guo@...ky.com>
> ---
>  .../bindings/interrupt-controller/csky,mpintc.txt  | 40 ++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
>
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt b/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
> new file mode 100644
> index 0000000..49d1658
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
> @@ -0,0 +1,40 @@
> +===========================================
> +C-SKY Multi-processors Interrupt Controller
> +===========================================
> +
> +C-SKY Multi-processors Interrupt Controller is designed for ck807/ck810/ck860
> +SMP soc, and it also could be used in non-SMP system.

How is it accessed? No mmio registers?

> +
> +Interrupt number definition:
> +
> +  0-15  : software irq, and we use 15 as our IPI_IRQ.
> + 16-31  : private  irq, and we use 16 as the co-processor timer.
> + 31-1024: common irq for soc ip.
> +
> +=============================
> +intc node bindings definition
> +=============================
> +
> +       Description: Describes SMP interrupt controller
> +
> +       PROPERTIES
> +
> +        - compatible
> +               Usage: required
> +                Value type: <string>
> +                Definition: must be "csky,mpintc"
> +        - interrupt-cells
> +                Usage: required
> +                Value type: <u32>
> +                Definition: must be <1>
> +        - interrupt-controller:
> +                Usage: required
> +
> +Examples:
> +---------
> +
> +       intc: interrupt-controller {
> +               compatible = "csky,mpintc";
> +               #interrupt-cells = <1>;
> +               interrupt-controller;
> +       };
> --
> 2.7.4
>