lp3972_reg_read
val = lp3972_reg_read(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo));
reg = lp3972_reg_read(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo));
val = lp3972_reg_read(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck));
reg = lp3972_reg_read(lp3972, LP3972_BUCK_VOL1_REG(buck));