REG_RAMPCTRL
ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
__func__, REG_RAMPCTRL, ret);
ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
__func__, REG_RAMPCTRL, ret);
st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
__func__, REG_RAMPCTRL, st);