LTC2688_CMD_CH_SETTING
ret = regmap_read(st->regmap, LTC2688_CMD_CH_SETTING(c), ®);
ret = regmap_read(st->regmap, LTC2688_CMD_CH_SETTING(chan->channel),
LTC2688_CMD_CH_SETTING(chan->channel),
ret = regmap_read(st->regmap, LTC2688_CMD_CH_SETTING(chan->channel),
LTC2688_CMD_CH_SETTING(chan->channel),
ret = regmap_write(st->regmap, LTC2688_CMD_CH_SETTING(reg),