linux-kernel - Re: [PATCH 1/2] devicetree: add binding for Sigma Designs SMP86xx interrupt controller

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Date:	Fri, 20 Nov 2015 10:23:04 -0600
From:	Rob Herring <robh@...nel.org>
To:	Mans Rullgard <mans@...sr.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] devicetree: add binding for Sigma Designs SMP86xx
 interrupt controller

On Thu, Nov 19, 2015 at 06:33:45PM +0000, Mans Rullgard wrote:
> This adds a binding for the secondary interrupt controller in
> Sigma Designs SMP86xx and SMP87xx chips.
> 
> Signed-off-by: Mans Rullgard <mans@...sr.com>
> ---
>  .../interrupt-controller/sigma,smp8642-intc.txt    | 47 ++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/sigma,smp8642-intc.txt
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/sigma,smp8642-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/sigma,smp8642-intc.txt
> new file mode 100644
> index 0000000..f82cddf
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/sigma,smp8642-intc.txt
> @@ -0,0 +1,47 @@
> +Sigma Designs SMP86xx/SMP87xx secondary interrupt controller
> +
> +Required properties:
> +- compatible: should be "sigma,smp8642-intc"
> +- reg: physical address of MMIO region
> +- interrupt-parent: phandle of parent interrupt controller
> +- interrupt-controller: boolean
> +
> +One child node per control block with properties:
> +- sigma,reg-offset: offset of registers from main base address

Your driver defines these offsets too.

Do you expect to have many different variations here? If not, I would 
get rid of all the child nodes and just hard code it in the driver.

You could also simply do:

sigma,reg-offset = <0x0 0x100 0x300>;

> +- interrupt-controller: boolean
> +- #interrupt-cells: should be <2>, interrupt index and flags per interrupts.txt
> +- interrupts: interrupt spec of primary interrupt controller
> +- label: (optional) name for display purposes

NAK. Interrupt controllers are not really visible to users. Think of 
physical labels on things like connectors or LEDs.

> +
> +Example:
> +
> +intc: interrupt-controller@...00 {
> +	compatible = "sigma,smp8642-intc";
> +	reg = <0x6e000 0x400>;
> +	interrupt-parent = <&gic>;
> +	interrupt-controller;
> +
> +	irq0: irq0 {
> +		sigma,reg-offset = <0x000>;
> +		interrupt-controller;
> +		#interrupt-cells = <2>;
> +		interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
> +		label = "IRQ0";
> +	};
> +
> +	irq1: irq1 {
> +		sigma,reg-offset = <0x100>;
> +		interrupt-controller;
> +		#interrupt-cells = <2>;
> +		interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
> +		label = "IRQ1";
> +	};
> +
> +	irq2: irq2 {
> +		sigma,reg-offset = <0x300>;
> +		interrupt-controller;
> +		#interrupt-cells = <2>;
> +		interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
> +		label = "IRQ2";
> +	};
> +};
> -- 
> 2.6.3
> 
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