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Below is a structured, technical exposition covering architecture, Linux driver model mapping, initialization sequence, power and clock control, PHY and PHY drivers, endpoint and transfer handling, DMA and scatter‑gather, OTG role management, common issues and debugging, performance tuning, and patch/porting notes.

On removal: reverse sequence — unregister, free IRQs, phy_power_off, clocks disable, assert resets, release regulators.