On 2018-03-05 16:53, Wolfram Sang wrote: > >> @@ -97,59 +98,83 @@ static const struct chip_desc chips[] = { >> .nchans = 2, >> .enable = 0x4, >> .muxtype = pca954x_ismux, >> + .id = { .manufacturer_id = I2C_DEVICE_ID_NONE }, > > Can't we just leave this empty and add a NULL pointer check below when > testing for the device id? Nope, it's not a pointer. I didn't think it should be, but maybe it should? The drawback is that you have to create an extra variable for each of the chips that do need an id, and I didn't fancy that... Cheers, Peter