linux-kernel - Re: [RFC PATCH v2 2/2] drivers: mfd: vexpress: add Serial Power Controller (SPC) support

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Message-ID: <20130605182225.GB2650@e102568-lin.cambridge.arm.com>
Date:	Wed, 5 Jun 2013 19:22:25 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	"Jon Medhurst (Tixy)" <tixy@...aro.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Pawel Moll <Pawel.Moll@....com>,
	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>,
	Achin Gupta <Achin.Gupta@....com>,
	Amit Kucheria <amit.kucheria@...aro.org>
Subject: Re: [RFC PATCH v2 2/2] drivers: mfd: vexpress: add Serial Power
 Controller (SPC) support

On Wed, Jun 05, 2013 at 07:08:33PM +0100, Jon Medhurst (Tixy) wrote:
> On Wed, 2013-06-05 at 12:46 +0100, Lorenzo Pieralisi wrote:
> [...]
> > +static const struct of_device_id vexpress_spc_ids[] __initconst = {
> > +	{ .compatible = "arm,vexpress-spc,v2p-ca15_a7" },
> > +	{ .compatible = "arm,vexpress-spc" },
> > +	{},
> > +};
> > +
> > +static int __init vexpress_spc_init(void)
> > +{
> > +	int ret;
> > +	struct device_node *node = of_find_matching_node(NULL,
> > +							 vexpress_spc_ids);
> 
> To allow for devices without an SPC we should check for !node here and
> bail out, otherwise we get an ugly message from the WARN_ON further
> down. I see this on RTSM, and multiplatform kernels would suffer this as
> well.
> 
> Even if the ugly warning wasn't there, it still seems cleaner to me to
> have a proper check for an absent spc node.

Absolutely, I will apply both fixes, thanks a lot for the review.

Lorenzo

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