CH_R_LENGTH
val = reg_encode(reg, CH_R_LENGTH, size);
[CH_R_LENGTH] = GENMASK(15, 0),
[CH_R_LENGTH] = GENMASK(15, 0),
[CH_R_LENGTH] = GENMASK(15, 0),
[CH_R_LENGTH] = GENMASK(19, 0),
[CH_R_LENGTH] = GENMASK(15, 0),
[CH_R_LENGTH] = GENMASK(19, 0),
[CH_R_LENGTH] = GENMASK(23, 0),