linux-kernel - Re: [PATCH v2 1/5] dt-bindings: interrupt-controller: Add Renesas RZ/A1 Interrupt Controller

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Date:   Tue, 30 Apr 2019 10:02:54 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Chris Brandt <chris.brandt@...esas.com>,
        devicetree@...r.kernel.org,
        "open list:MEDIA DRIVERS FOR RENESAS - FCP" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/5] dt-bindings: interrupt-controller: Add Renesas
 RZ/A1 Interrupt Controller

On Tue, Apr 30, 2019 at 7:13 AM Geert Uytterhoeven
<geert+renesas@...der.be> wrote:
>
> Add DT bindings for the Renesas RZ/A1 Interrupt Controller.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> v2:
>   - Add "renesas,gic-spi-base",
>   - Document RZ/A2M.
> ---
>  .../renesas,rza1-irqc.txt                     | 30 +++++++++++++++++++
>  1 file changed, 30 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/renesas,rza1-irqc.txt
>
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/renesas,rza1-irqc.txt b/Documentation/devicetree/bindings/interrupt-controller/renesas,rza1-irqc.txt
> new file mode 100644
> index 0000000000000000..ea8ddb6955338ccd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/renesas,rza1-irqc.txt
> @@ -0,0 +1,30 @@
> +DT bindings for the Renesas RZ/A1 Interrupt Controller
> +
> +The RZ/A1 Interrupt Controller is a front-end for the GIC found on Renesas
> +RZ/A1 and RZ/A2 SoCs:
> +  - IRQ sense select for 8 external interrupts, 1:1-mapped to 8 GIC SPI
> +    interrupts,
> +  - NMI edge select.
> +
> +Required properties:
> +  - compatible: Must be "renesas,<soctype>-irqc", and "renesas,rza1-irqc" as
> +               fallback.
> +               Examples with soctypes are:
> +                 - "renesas,r7s72100-irqc" (RZ/A1H)
> +                 - "renesas,r7s9210-irqc" (RZ/A2M)
> +  - #interrupt-cells: Must be 2 (an interrupt index and flags, as defined
> +                                in interrupts.txt in this directory)
> +  - interrupt-controller: Marks the device as an interrupt controller
> +  - reg: Base address and length of the memory resource used by the interrupt
> +         controller
> +  - renesas,gic-spi-base: Lowest GIC SPI interrupt number this block maps to.

Why isn't this just an 'interrupts' property? Plus, without
'interrupts' walking the hierarchy is broken.

Rob