OSC_CTRL_PLL_REF_DIV_MASK   28 drivers/clk/tegra/clk-tegra20.c #define OSC_CTRL_PLL_REF_DIV_MASK (3<<28)
OSC_CTRL_PLL_REF_DIV_MASK   32 drivers/clk/tegra/clk-tegra30.c #define OSC_CTRL_PLL_REF_DIV_MASK	(3<<26)