PLLU_BASE_CLKENABLE_USB  227 drivers/clk/tegra/clk-pll.c #define PLLU_BASE_CLKENABLE_USB BIT(21)
PLLU_BASE_CLKENABLE_USB  468 drivers/clk/tegra/clk-tegra210.c #define PLLU_BASE_CLKENABLE_USB		(1 << 21)