linux-kernel - Re: [RFC v1 5/5] ARM: mvebu: add board init for Armada 1500

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Date:	Sat, 17 Aug 2013 17:38:02 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v1 5/5] ARM: mvebu: add board init for Armada 1500

Dear Sebastian Hesselbarth,

On Fri, 16 Aug 2013 21:41:38 +0200, Sebastian Hesselbarth wrote:

> I am not so sure about the .map_io but I didn't yet fully understand
> the mapping requirement. Anyway, it is required for iomap and friends
> to work and basically remaps physical register addressed onto the same
> virtual addresses.

You should normally be able to completely avoid the ->map_io() hook. If
you leave it set to NULL, it will automatically call
debug_ll_io_init(), which will setup the virt->phys mapping needed by
DEBUG_LL stuff. All the other mappings will be created dynamically with
ioremap().

The static mapping covering all registers is really no longer needed.

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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