On Thursday, October 14, 2010 2:58 PM, Ryan Mallon wrote:
> On 10/15/2010 10:46 AM, H Hartley Sweeten wrote:
>> On Thursday, October 14, 2010 7:49 AM, Mika Westerberg wrote:
>>>
>>> +void __init ep93xx_register_ac97(void)
>>> +{
>>> + /*
>>> + * Make sure that the AC97 pins are not used by I2S.
>>> + */
>>> + ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONAC97);
>>
>> This is fine for now.
>>
>> Eventually some thought should go into a proper iomux to prevent
>> loading drivers with conflicting pin requirements. Currently, depending
>> on the configuration, this could break if a user should try to use the
>> ac97 and i2s audio at the same time (I2SONAC97 mode). But, the same
>> problem already exists if a user tries using spi and i2s audio (I2SONSSP
>> mode).
>
> I initially suggested this also, since we have acquire/release functions
> for some other drivers, but I now think this is fine as is. It's highly
> unlikely that a board is going to have both I2S and AC97 audio. We can
> change this later if such a board shows up, no need to make the code
> more complicated for hypothetical boards :-).
Agree. That's why I said eventually.... ;-)
The only platforms I know of that have both audio systems are the EDB9307,
EDB9312, and EDB9315 boards from Cirrus. I don't have any of these so,
unless someone steps up with one to test, Mika's implementation is fine.
Regards,
Hartley
_______________________________________________
Alsa-devel mailing list
Alsa-devel@xxxxxxxxxxxxxxxx
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
