linux-kernel - Re: [PATCH v7 4/4] dt-bindings: add bindings for mediatek sysirq

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Date:	Wed, 19 Nov 2014 18:07:25 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Pawel Moll <Pawel.Moll@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"hc.yen@...iatek.com" <hc.yen@...iatek.com>,
	"srv_heupstream@...iatek.com" <srv_heupstream@...iatek.com>,
	"yh.chen@...iatek.com" <yh.chen@...iatek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Rob Herring <robh+dt@...nel.org>,
	"nathan.chung@...iatek.com" <nathan.chung@...iatek.com>,
	"yingjoe.chen@...il.com" <yingjoe.chen@...il.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	"eddie.huang@...iatek.com" <eddie.huang@...iatek.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v7 4/4] dt-bindings: add bindings for mediatek sysirq

On Wed, Nov 19, 2014 at 02:14:11PM +0000, Yingjoe Chen wrote:
> Add binding documentation for Mediatek SoC SYSIRQ.
> 
> Signed-off-by: Yingjoe Chen <yingjoe.chen@...iatek.com>
> ---
>  .../bindings/arm/mediatek/mediatek,sysirq.txt      | 26 ++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,sysirq.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,sysirq.txt b/Documentation/devicetree/bindings/arm/mediatek/mediatek,sysirq.txt
> new file mode 100644
> index 0000000..8669536
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,sysirq.txt
> @@ -0,0 +1,26 @@
> +Mediatek 65xx/81xx sysirq
> +
> +Mediatek SOCs sysirq support controllable irq inverter for each GIC SPI
> +interrupt.
> +
> +Required properties:
> +- compatible: should be one of:
> +	"mediatek,mt8135-sysirq"
> +	"mediatek,mt8127-sysirq"
> +	"mediatek,mt6589-sysirq"
> +	"mediatek,mt6582-sysirq"
> +	"mediatek,mt6577-sysirq"
> +- interrupt-controller : Identifies the node as an interrupt controller
> +- #interrupt-cells : Must use the same cells/format as parent controller.
> +- interrupt-parent: phandle of irq domain parent for sysirq.

I'm concerned that this sounds very general while the binding assumes
the GICv2 interrupt-specifier format. Either the driver needs to become
more general, or this needs to be tightened up.

It's also odd to say "irq domain parent", as that's purely a Linux
construct and has nothing to do with the HW.

Thanks,
Mark.

> +- reg: Physical base address of the intpol registers and length of memory
> +  mapped region.
> +
> +Example:
> +	sysirq: interrupt-controller@...00100 {
> +		compatible = "mediatek,mt6589-sysirq", "mediatek,mt6577-sysirq";
> +		interrupt-controller;
> +		#interrupt-cells = <3>;
> +		interrupt-parent = <&gic>;
> +		reg = <0 0x10200100 0 0x1c>;
> +	};
> -- 
> 1.8.1.1.dirty
> 
> 
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