HDR_LEN_MSB
WARN_ON(header_size > reg_field_max(reg, HDR_LEN_MSB));
val |= reg_encode(reg, HDR_LEN_MSB, header_size);
[HDR_LEN_MSB] = GENMASK(29, 28),
[HDR_LEN_MSB] = GENMASK(29, 28),
[HDR_LEN_MSB] = GENMASK(29, 28),
[HDR_LEN_MSB] = GENMASK(29, 28),
[HDR_LEN_MSB] = GENMASK(29, 28),
[HDR_LEN_MSB] = GENMASK(29, 28),