Hi Pierre, Thank you so much for your reply, and for sharing your repo. This is great news for me, as I was blocked for a while on this issue. And I'm particularly happy that this is all done on top of the 4.3 Kernel, this is very professional of you. I will try the code, and definitely let you know how it goes, or if I have any issues. Thank you again, Michael On Tue, Nov 10, 2015 at 10:53 AM, Pierre-Louis Bossart < pierre-louis.bossart@xxxxxxxxxxxxxxx> wrote: > Hi Michael, > > I have the MinnowBoard Max with Baytrail Atom (ValleyView) SoC. >> I'm attempting to write an Alsa (ASoC) driver for my sound card to >> work with this board. >> PCM should work through I2S for this sound card I have. >> > > Good to hear. There are several folks in Intel trying to enable I2S over > the low-speed connector for 3rd party enablement or help 'makers'. This is > still work-in-progress but we can already share some elements of > information based on our own experience: > 1. the default 0.82 firmware doesn't enable the I2S pins, we are currently > using a DSDT override to configure them. > 2. the audio codec needs to be registered as a child of I2C6 (it's > typically I2C2 on regular baytrail platforms). this is also part of the > DSDT override. > 3. since we need to support multiple audio codecs, we'd like to add a > mechanism to add information in the SSDT table to be able to boot the same > kernel and select the right drivers. Alternatively you will have to use the > DSDT override method until this mechanism is ready. > 4. there is no MCLK on existing MinnowBoards, so your codec will have to > drive its PLL from the BLCK. newer versions of the MinnowBoard Turbot will > support an MCLK but they are in pre-production stage and to the best of my > knowledge not available commercially yet. > 5. to get the best long-term support you really want to use the newer > DPCM-based driver/firmware for e.g 24-bit, TDM and deep-buffer support. We > have a set of patches that have not been published upstream yet but if you > are interested you can look at my github > https://github.com/plbossart/sound/tree/minnow-v4.3-24bit. In theory if > you take this code and change the DSDT to support your _HID just like it > was done for the rt5651 the drivers should load and register a sound card. > Disclaimer: there is no official support on this branch and rebases/fixes > may happen at any time. the code will be submitted upstream when ready. > > If you provide more information on which codec you are trying to link to > we can help further. > -Pierre > -- [image: DAQRI] <http://daqri.com/> Michael Pogrebinsky Senior Android Developer - DAQRI Smart Helmet Applications *Tel:* *844-327-7443* michael.pogrebinsky@xxxxxxxxx <stephen.keegan@xxxxxxxxx> DAQRI.com <http://daqri.com/> _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
