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Subject: Re: [alsa-devel] [PATCH 1/2] powerpc: add platform registration
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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Timur Tabi <timur@freescale.com>
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Date: Wed, 28 Apr 2010 14:19:19 +1000
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Cc: alsa-devel@alsa-project.org, kumar.gala@freescale.com,
	broonie@opensource.wolfsonmicro.com, linuxppc-dev@ozlabs.org,
	Liam Girdwood <lrg@slimlogic.co.uk>
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On Tue, 2010-04-27 at 15:04 -0500, Timur Tabi wrote:
> What I need is something like a hashing function that can convert a
> "struct device_node *" into an "int".  I'm going to have two functions
> that independently parse the device tree and locate a specific node.
> Both functions will "register the node" with asoc, but they'll use an
> integer ID to uniquely identify the node.
> 
> At least, that's the way ASoC likes to operate.  AsoC takes a fixed
> string plus a unique integer.  I could technically create a unique
> string for each DMA device, and have the integer always be 0. 

That's just plain gross and horrible. You could use phandles you
know :-)

Or you could use path in your strings, or something like that.

Note that any time you have a struct device, you have a free device_node
pointer as well.

Cheers,
Ben.