[alsa-devel] how to use mcbsp for i2s?

Jarkko Nikula jhnikula at gmail.com
Thu Apr 2 12:20:36 CEST 2009

On Thu, Apr 2, 2009 at 10:48 AM, Jarkko Nikula <jhnikula at gmail.com> wrote:

> But by default McBSP1 and 3 which available in Beale pin header are muxed
> to GPIO
> so you need to mux those pins for McBSP by the bootloader and with
> linux-omap
> kernel multiplexing support.
> I may have a hack patch somewhere... I'll try to find it and post it here
> for reference.
> Grrr... cannot find the hack, I'm too keen to delete temporary hacks. I was
pretty sure I had
it somewhere.

Basically it was adding necessary pin multiplexing configuration into
arch/arm/plat-omap/include/mach/mux.h and arch/arm/mach-omap2/mux.c and
then using omap_cfg_reg(...) in omap3beagle.c to change pin configuration
GPIOs to McBPS[1 | 3] pins.


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