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Documentation: soundwire: Add documentation for multi link 

Add example and documentation to describe multi link streams

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com>
Signed-off-by: Shreyas NC <shreyas.nc@intel.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
4.20.x+fslc
Sanyog Kale 2018-07-27 14:44:11 +05:30 committed by Vinod Koul
parent 8d6ccf5ceb
commit 8cf3f9cfd9
1 changed files with 28 additions and 0 deletions
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Documentation/driver-api/soundwire/stream.rst
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@ -101,6 +101,34 @@ interface. ::
+--------------------+ | |
+----------------+
Example 5: Stereo Stream with L and R channel is rendered by 2 Masters, each
rendering one channel, and is received by two different Slaves, each
receiving one channel. Both Masters and both Slaves are using single port. ::
+---------------+ Clock Signal +---------------+
| Master +----------------------------------+ Slave |
| Interface | | Interface |
| 1 | | 1 |
| | Data Signal | |
| L +----------------------------------+ L |
| (Data) | Data Direction | (Data) |
+---------------+ +-----------------------> +---------------+
+---------------+ Clock Signal +---------------+
| Master +----------------------------------+ Slave |
| Interface | | Interface |
| 2 | | 2 |
| | Data Signal | |
| R +----------------------------------+ R |
| (Data) | Data Direction | (Data) |
+---------------+ +-----------------------> +---------------+
Note: In multi-link cases like above, to lock, one would acquire a global
lock and then go on locking bus instances. But, in this case the caller
framework(ASoC DPCM) guarantees that stream operations on a card are
always serialized. So, there is no race condition and hence no need for
global lock.
SoundWire Stream Management flow
================================