Merge series "add channel constraint for BDW machine drivers" from Brent Lu <brent...

Merge series "add channel constraint for BDW machine drivers" from Brent Lu <brent.lu@intel.com>:

The machine driver bdw-rt5650 (for Google buddy) supports 2 or 4-channel
recording while other two drivers support only 2-channel recording. HW
constraints are implemented to reflect the hardware limitation on BDW
platform.

Changes since v1:
- Change the patch title.
- Remove the DUAL_CHANNEL and QUAD_CHANNEL macros which are too obvious.
- Follow the naming convertion, using 'bdw_rt5650_' and 'bdw_rt5677_' to
  name startup functions.
- Refine the comments in startup functions.
- Redesign the bdw_rt5650_fe_startup() function for readability.
- Add an assignment to initialize runtime->hw.channels_max variable.

Brent Lu (3):
  ASoC: bdw-rt5677: add channel constraint
  ASoC: bdw-rt5650: add channel constraint
  ASoC: broadwell: add channel constraint

 sound/soc/intel/boards/bdw-rt5650.c | 29 +++++++++++++++++++++++++++++
 sound/soc/intel/boards/bdw-rt5677.c | 26 ++++++++++++++++++++++++++
 sound/soc/intel/boards/broadwell.c  | 26 ++++++++++++++++++++++++++
 3 files changed, 81 insertions(+)

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2.7.4