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| author | Sanyog Kale <sanyog.r.kale@intel.com> | 2018-07-27 12:14:11 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2018-08-27 07:19:48 +0300 |
| commit | 8cf3f9cfd9dc9e448012576b9a06cce2d294e400 (patch) | |
| tree | 42b9f8782a4c799f50a22ce10874a0a4791fee8c /Documentation/driver-api | |
| parent | 8d6ccf5cebbc7ed1dee9986e36853a78dfb64084 (diff) | |
| download | linux-8cf3f9cfd9dc9e448012576b9a06cce2d294e400.tar.xz | |
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>
Diffstat (limited to 'Documentation/driver-api')
| -rw-r--r-- | Documentation/driver-api/soundwire/stream.rst | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/Documentation/driver-api/soundwire/stream.rst b/Documentation/driver-api/soundwire/stream.rst index 29121aa55fb9..19482eedc3bf 100644 --- a/Documentation/driver-api/soundwire/stream.rst +++ b/Documentation/driver-api/soundwire/stream.rst @@ -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 ================================ |