linux-kernel - Re: [PATCH v3 11/13] of: add property iteration helpers

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Date:	Fri, 26 Aug 2011 17:16:33 +0100
From:	Jamie Iles <jamie@...ieiles.com>
To:	Stephen Warren <swarren@...dia.com>
Cc:	Jamie Iles <jamie@...ieiles.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Colin Cross <ccross@...roid.com>,
	Erik Gilling <konkers@...roid.com>,
	Olof Johansson <olof@...om.net>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Belisko Marek <marek.belisko@...il.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Sergei Shtylyov <sshtylyov@...sta.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v3 11/13] of: add property iteration helpers

On Fri, Aug 26, 2011 at 08:59:44AM -0700, Stephen Warren wrote:
> Jamie Iles wrote at Friday, August 26, 2011 3:27 AM:
> > For the !CONFIG_OF case, I *think* that
> > of_iter_u32_prop and of_iter_string_prop can be empty struct's, but I
> > wouldn't want to bet money on that!
> 
> Empty structs themselves certainly did compile OK, but the code that
> uses these macros references iter.value directly, and isn't under #ifdef
> CONFIG_OF, so that field has to exist.
> 
> I suppose an alternative would be to add an accessor function:
> 
> struct of_iter_string_prop iter;
> for_each_string_property_value(iter, np, "pins")
>         printk("Got value %s\n", of_iter_string_value(iter));
> 
> which would return NULL/"" when !CONFIG_OF, and hence allow iter.value
> to be removed too. Do you think that's a good approach? It'd be easy to
> implement.

I think I prefer what you have now rather than a separate accessor, but 
I'm happy either way!

Jamie
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