linux-kernel - Re: [PATCH v4 5/5] clk: dt: binding for basic gate clock

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Message-ID: <20130904175909.GB31541@atomide.com>
Date:	Wed, 4 Sep 2013 10:59:09 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Haojian Zhuang <haojian.zhuang@...aro.org>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Mike Turquette <mturquette@...aro.org>,
	Kevin Hilman <khilman@...aro.org>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Matt Sealey <neko@...uhatsu.net>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Tero Kristo <t-kristo@...com>,
	Heiko Stübner <heiko@...ech.de>,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v4 5/5] clk: dt: binding for basic gate clock

* Haojian Zhuang <haojian.zhuang@...aro.org> [130903 20:11]:
> 
> We can see that it'll try to find static mapping. What's the static mapping?
> If we define iotable in machine driver, we have the static mapping, just like
> debug_ll. If we parse everything from DTS file, it'll always get a new virtual
> address from vm area. So it always create a new page mapping even for one
> register.

I may not follow you here.. But it seems that you've missing something with
the static mapping: It's found based on the physical address. So if you
create static mappings for your SoC with iotable_init(), those mappings
will be available everywhere including drivers when you do ioremap().

Regards,

Tony
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