rpm_reg_write
ret = rpm_reg_write(vreg, req, uV / 1000);
ret = rpm_reg_write(vreg, req, uV);
ret = rpm_reg_write(vreg, req, vreg->uV / 1000);
ret = rpm_reg_write(vreg, req, vreg->uV);
ret = rpm_reg_write(vreg, req, 1);
ret = rpm_reg_write(vreg, req, 0);
ret = rpm_reg_write(vreg, req, 0);
ret = rpm_reg_write(vreg, req, 0);
ret = rpm_reg_write(vreg, req, load_mA);