These patches add basic support for audio on the Chromebook Pixel 2015. I took the machine driver from ChromeOS commit v3.14-10186-g7e7d95df2983 and other than removing support for wake on voice (which is not supported by the mainline rt5677 codec driver), the only differences are to cope with API changes since 3.14.
Only two authors have committed changes to the machine driver in the ChromeOS tree and all of the commits are signed off; both authors' SoB lines are preserved in the second commit here.
The codec driver is sufficiently different that I just added ACPI support from scratch using the ChromeOS source as a reference for the property names.
John Keeping (2): ASoC: rt5677: Add ACPI support ASoC: Intel: boards: Add bdw-rt5677 machine driver
sound/soc/codecs/rt5677.c | 109 +++++++++--- sound/soc/intel/Kconfig | 11 ++ sound/soc/intel/boards/Makefile | 2 + sound/soc/intel/boards/bdw-rt5677.c | 341 ++++++++++++++++++++++++++++++++++++ sound/soc/intel/common/sst-acpi.c | 1 + 5 files changed, 443 insertions(+), 21 deletions(-) create mode 100644 sound/soc/intel/boards/bdw-rt5677.c