linux-kernel - Re: [PATCH v7 3/4] ARM: mediatek: Add sysirq in mt6589/mt8135/mt8127 dtsi

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Date:	Wed, 19 Nov 2014 17:49:49 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Mark Rutland <Mark.Rutland@....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\@vger.kernel.org" <devicetree@...r.kernel.org>,
	"hc.yen\@mediatek.com" <hc.yen@...iatek.com>,
	"srv_heupstream\@mediatek.com" <srv_heupstream@...iatek.com>,
	"yh.chen\@mediatek.com" <yh.chen@...iatek.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"grant.likely\@linaro.org" <grant.likely@...aro.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Rob Herring <robh+dt@...nel.org>,
	"nathan.chung\@mediatek.com" <nathan.chung@...iatek.com>,
	"yingjoe.chen\@gmail.com" <yingjoe.chen@...il.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	"eddie.huang\@mediatek.com" <eddie.huang@...iatek.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	"linux- arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v7 3/4] ARM: mediatek: Add sysirq in mt6589/mt8135/mt8127 dtsi

On Wed, Nov 19 2014 at  2:14:10 pm GMT, Yingjoe Chen <yingjoe.chen@...iatek.com> wrote:
> Add sysirq settings for mt6589/mt8135/mt8127
> This also correct timer interrupt flag. The old setting works
> because boot loader already set polarity for timer interrupt.
> Without intpol support, the setting was not changed so gic
> can get the irq correctly.
>
> Signed-off-by: Yingjoe Chen <yingjoe.chen@...iatek.com>
> ---
>  arch/arm/boot/dts/mt6589.dtsi | 14 ++++++++++++--
>  arch/arm/boot/dts/mt8127.dtsi | 14 ++++++++++++--
>  arch/arm/boot/dts/mt8135.dtsi | 14 ++++++++++++--
>  3 files changed, 36 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/boot/dts/mt6589.dtsi b/arch/arm/boot/dts/mt6589.dtsi
> index e3c7600..c91b2a9 100644
> --- a/arch/arm/boot/dts/mt6589.dtsi
> +++ b/arch/arm/boot/dts/mt6589.dtsi
> @@ -19,7 +19,7 @@
>  
>  / {
>  	compatible = "mediatek,mt6589";
> -	interrupt-parent = <&gic>;
> +	interrupt-parent = <&sysirq>;

This worries me a bit. Your sysirq cannot handle PPIs, and yet you make
it the top-level interrupt controller, without amending any PPI.

Does it mean you do not use *any* PPI? No per-cpu timer, nothing?

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny.
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