Re: [PATCH 1/2] powerpc: add platform registration for ALSA SoC drivers

[Grant Likely <grant.likely@secretlab.ca>]

On Tue, Apr 27, 2010 at 12:32 PM, Timur Tabi <timur@freescale.com> wrote:
> Liam Girdwood wrote:
>
>>> I would need some way for fsl_dma_open() to get a pointer to private,
>>> DMA-specific data.  I'm not sure how I can do that.
>>
>> In multi-component we now have platform_data and device private data
>> (from the regular driver model).
>
> In that case, I still have the same problem with how to generate an 'id' based on a device tree node.  We have the idea of a 'phandle', which is a unique integer for a node, but there's no way to create phandles from within Linux.  They have to exist in the DTS first, and I'm loathe to modify the DTS.

Can you not dynamically assign an id?  If alsa soc needs a unique id
number, then just create a lookup function.  Something like
of_asoc_phandle_to_codec_id() that will either return a previously
assigned id, or will assign a new id.  You shouldn't ever need to add
data to the tree at runtime.

g.