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>
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@ -101,6 +101,34 @@ interface. ::
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+--------------------+ | |
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+----------------+
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Example 5: Stereo Stream with L and R channel is rendered by 2 Masters, each
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rendering one channel, and is received by two different Slaves, each
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receiving one channel. Both Masters and both Slaves are using single port. ::
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+---------------+ Clock Signal +---------------+
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| Master +----------------------------------+ Slave |
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| Interface | | Interface |
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| 1 | | 1 |
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| | Data Signal | |
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| L +----------------------------------+ L |
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| (Data) | Data Direction | (Data) |
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+---------------+ +-----------------------> +---------------+
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+---------------+ Clock Signal +---------------+
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| Master +----------------------------------+ Slave |
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| Interface | | Interface |
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| 2 | | 2 |
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| | Data Signal | |
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| R +----------------------------------+ R |
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| (Data) | Data Direction | (Data) |
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+---------------+ +-----------------------> +---------------+
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Note: In multi-link cases like above, to lock, one would acquire a global
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lock and then go on locking bus instances. But, in this case the caller
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framework(ASoC DPCM) guarantees that stream operations on a card are
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always serialized. So, there is no race condition and hence no need for
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global lock.
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SoundWire Stream Management flow
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================================
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