linux-kernel - Re: [PATCH V2 16/19] irqchip: crossbar: introduce ti,max-crossbar-sources to identify valid crossbar mapping

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Message-ID: <20140613131720.GI8664@titan.lakedaemon.net>
Date:	Fri, 13 Jun 2014 09:17:20 -0400
From:	Jason Cooper <jason@...edaemon.net>
To:	Sricharan R <r.sricharan@...com>
Cc:	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	tony@...mide.com, santosh.shilimkar@...com, nm@...com,
	rnayak@...com, linux@....linux.org.uk, tglx@...utronix.de
Subject: Re: [PATCH V2 16/19] irqchip: crossbar: introduce
 ti,max-crossbar-sources to identify valid crossbar mapping

On Fri, Jun 13, 2014 at 04:24:52PM +0530, Sricharan R wrote:
> On Thursday 12 June 2014 07:24 PM, Jason Cooper wrote:
> > On Thu, Jun 12, 2014 at 05:23:24PM +0530, Sricharan R wrote:
...
> >> +	of_property_read_u32(node, "ti,max-crossbar-sources",
> >> +			     &cb->max_crossbar_sources);
> >> +	if (!cb->max_crossbar_sources) {
> >> +		pr_err("missing 'ti,max-crossbar-sources' property\n");
> >> +		ret = -EINVAL;
> >> +		goto err_base;
> >> +	}
> > 
> > This completely breaks all boards using old dtbs.  Please set
> > max_crossbar_sources to a sane value (400) when the property is missing.
> > 
> >> +
> >>  	of_property_read_u32(node, "ti,max-irqs", &max);
> >>  	if (!max) {
> >>  		pr_err("missing 'ti,max-irqs' property\n");
> > 
> > I know this is context, but you may want to look at this property as
> > well and set it to a sane value instead of erroring out.
> > 
>  crossbar dts node itself is not there in any dts yet. So this is not applicable
>  for any old boards. Any future dts with crossbar node should have this property
>  defined.

Now that I see the dra7.dtsi changes, I fully agree.

thx,

Jason.
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