It's used only as a dev dependency in 6 crates.

Depender (with downloads and own rev deps) esp-hal-smartled version
600 1 esp32s3-hal dev ^0.8.0
550 2 esp32c3-hal dev ^0.8.0
550 1 esp32s2-hal dev ^0.8.0
470 5 esp32-hal dev ^0.8.0
210 1 esp32c6-hal dev ^0.8.0
esp32h2-hal dev ^0.8.0