linux-kernel - Re: [PATCH v3 4/7] ARM: mediatek: Add sysirq interrupt polarity support

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Date:	Thu, 09 Oct 2014 16:37:25 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	"Joe. C" <yingjoe.chen@...iatek.com>, arm@...nel.org,
	Rob Herring <robh+dt@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Mark Rutland <mark.rutland@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Sricharan R <r.sricharan@...com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Russell King <linux@....linux.org.uk>, yingjoe.chen@...il.com,
	yh.chen@...iatek.com, nathan.chung@...iatek.com,
	Grant Likely <grant.likely@...aro.org>,
	devicetree@...r.kernel.org, Jason Cooper <jason@...edaemon.net>,
	Pawel Moll <pawel.moll@....com>,
	Matt Porter <mporter@...aro.org>,
	Marc Carino <marc.ceeeee@...il.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	eddie.huang@...iatek.com, srv_heupstream@...iatek.com,
	hc.yen@...iatek.com, linux-kernel@...r.kernel.org,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Sascha Hauer <kernel@...gutronix.de>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v3 4/7] ARM: mediatek: Add sysirq interrupt polarity support

On Thursday 09 October 2014 22:29:37 Joe. C wrote:

> +static int __init mtk_sysirq_of_init(struct device_node *node,
> +				   struct device_node *parent)
> +{
> +	struct device_node *parent_node;
> +	struct irq_domain *domain, *domain_parent = NULL;
> +	struct mt_sysirq_chip_data *chip_data;
> +	int ret = 0;
> +
> +	parent_node = of_irq_find_parent(node);
> +	if (parent_node) {
> +		domain_parent = irq_find_host(parent_node);
> +		of_node_put(parent_node);
> +	}

Just a small comment: I think the 'parent' argument to the function
already contains the device node you are looking up here, so
no need for the second variable or _find_parent call.

This means you can also drop the  = NULL assignment for the
domain.

	Arnd
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