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doc: migration/release: 3.7: Add LED strip changes
Adds changes about the LED strip driver Signed-off-by: Jamie McCrae <spam@helper3000.net>
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doc/releases/migration-guide-3.7.rst

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* The property ``in-gpios`` defined in :dtcompatible:`worldsemi,ws2812-gpio` has been
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renamed to ``gpios``. (:github:`68514`)
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* The ``chain-length`` and ``color-mapping`` properties have been added to all LED strip bindings
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and are now mandatory.
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* Added a new mandatory ``length`` function which returns the length (number of pixels) of an LED
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strip device.
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* Made ``update_channels`` function optional and removed unimplemented functions.
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Sensors
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=======
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doc/releases/release-notes-3.7.rst

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* Input
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* LED Strip
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* The ``chain-length`` and ``color-mapping`` properties have been added to all LED strip
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bindings.
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* MDIO
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* MFD

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