On 5/30/15 7:17 PM, li yuqian wrote: > i checked the mainline kernel, seems there is a I2S driver with DMA for > the MBM, if i want use I2S to connect a codec, where i can find the MBM > i2s driver?
Thanks to Kevin Strasser for educating me on the various components. There isn't an I2S bus driver like there is for SPI, I2C, etc. There are three components: 1) LPE Firmware for the SoC This communicates directly with the ADSP and I2S hw. You can find a build for Baytrail in the upstream linux-firmware repo, named: "fw_sst_0f28.bin-48kHz_i2s_master". This will need to get installed to the rootfs as "/lib/firmware/intel/fw_sst_0f28.bin-48kHz_i2s_master". 2) Machine-codec specific driver Assuming you are using the latest upstream kernel sources, you can find all the LPE machine drivers in "sound/soc/intel/boards". A corresponding machine driver for a Bay Trail SoC using the max98090 codec is "sound/soc/intel/boards/byt-max98090.c". The machine driver depends on the codec driver and LPE platform driver. LPE platform driver files for BYT: "sound/soc/intel/baytrail/*" 3) Codec driver For example: "sound/soc/codecs/max98090.c" -- Darren Hart Intel Open Source Technology Center _______________________________________________ elinux-MinnowBoard mailing list elinux-MinnowBoard@lists.elinux.org http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
