From Longman Dictionary of Contemporary English(all) grist to the mill(all) grist to the millBritish English, (all) grist for the mill American EnglishMORE/EXTRA something that is useful in a particular situation Any publicity is good – it’s all grist to the mill. → grist
Examples from the Corpus
(all) grist to the mill• This is all grist to the mill of orthodox social democratic analyses of crime.• In fact, all the events' of daily life are grist to the mill of these popular singers.• Humans had become mere technical grist to the mill like any base metal. 