BCM4378_PTB_CHUNK_SIZE
if (data_len > BCM4378_PTB_CHUNK_SIZE)
size_t chunks = DIV_ROUND_UP(fw->size, (size_t)BCM4378_PTB_CHUNK_SIZE);
transfer_len = min_t(size_t, left, BCM4378_PTB_CHUNK_SIZE);
bcm4377, fw->data + i * BCM4378_PTB_CHUNK_SIZE,
u8 data[BCM4378_PTB_CHUNK_SIZE];