Linux 7.0.2 add ws2812b#559
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Add vendor prefix for WorldSemi that makes WS2812B individually-addressable RGB LEDs. Signed-off-by: Chuanhong Guo <gch981213@gmail.com> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
This patch adds support for driving a chain of WS2812B LED chips using SPI bus. WorldSemi WS2812B is a individually addressable LED chip that can be chained together and controlled individually using a single wire. The chip recognize a long pulse as a bit of 1 and a short pulse as a bit of 0. Host sends a continuous stream of 24-bits color values, each LED chip takes the first 3 byte it receives as its color value and passes the leftover bytes to the next LED on the chain. This driver simulates this protocol using SPI bus by sending a long pulse as 3'b110 and a short pulse as 3'b100. The SPI frequency needs to be 2.105MHz~2.85MHz for the timing to be correct and the controller needs to transfer all the bytes continuously. Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Add dt binding schema for WorldSemi WS2812B driven using SPI bus. Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
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WS2812B Will be equipped on a future product, and hat accessories will also be developed