MIIC_CONVCTRL_CONV_MODE
val = FIELD_PREP(MIIC_CONVCTRL_CONV_MODE, conv_mode);
mask = MIIC_CONVCTRL_CONV_MODE;
val = FIELD_PREP(MIIC_CONVCTRL_CONV_MODE, CONV_MODE_RMII) |
mask = MIIC_CONVCTRL_CONV_MODE | MIIC_CONVCTRL_CONV_SPEED;