Thanks for your great project p44-ledchain for OpenWrt.
However I want something different. As you told p44-ledchain based on PWM bus and MT7688 does not support DMA over PWM, So your module is limited to 1K pixels on each PWM.
But I want large capacity pixels support by Omega2 board, and for this DMA is essential.
I believe I2S bus has DMA and if you build p44-ledchain driver on I2S bus we can have driver with DMA support.

Thanks & regards
jags