VCU_PLL_CTRL_FBDIV
vcu_pll_ctrl &= ~VCU_PLL_CTRL_FBDIV;
vcu_pll_ctrl |= FIELD_PREP(VCU_PLL_CTRL_FBDIV, cfg->fbdiv);
div = FIELD_GET(VCU_PLL_CTRL_FBDIV, vcu_pll_ctrl);