linux-kernel - Re: [PATCH V3 21/26] dt-bindings: interrupt-controller: C-SKY APB intc

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Date:   Wed, 5 Sep 2018 19:43:10 -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 21/26] dt-bindings: interrupt-controller: C-SKY APB intc

On Wed, Sep 5, 2018 at 7:10 AM Guo Ren <ren_guo@...ky.com> wrote:
>
> Signed-off-by: Guo Ren <ren_guo@...ky.com>
> ---
>  .../interrupt-controller/csky,apb-intc.txt         | 45 ++++++++++++++++++++++
>  1 file changed, 45 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..faa482c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt
> @@ -0,0 +1,45 @@
> +==============================
> +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.

Can't this be described in DT as 2 csky,apb-intc nodes?

> + - csky,gx6605s-intc is gx6605s soc internal irq interrupt controller, 64 irq nums.
> +
> +=============================
> +intc node bindings definition
> +=============================
> +
> +        Description: Describes APB interrupt controller
> +
> +        PROPERTIES
> +
> +        - compatible
> +                Usage: required
> +                Value type: <string>
> +                Definition: must be "csky,apb-intc"
> +                                   "csky,dual-apb-intc"
> +                                   "csky,gx6605s-intc"
> +        - interrupt-cells

#interrupt-cells

> +                Usage: required
> +                Value type: <u32>
> +                Definition: must be <1>

No edge or level configuration?

> +       - reg
> +               Usage: required
> +               Value type: <u32 u32>
> +                Definition: <phyaddr size> in soc from cpu view
> +        - interrupt-controller:
> +                Usage: required
> +
> +Examples:
> +---------
> +
> +       intc: interrupt-controller {

Needs a unit-address.

> +               compatible = "csky,apb-intc";
> +               #interrupt-cells = <1>;
> +               reg = <0x00500000 0x400>;
> +               interrupt-controller;
> +       };
> --
> 2.7.4
>