Hi Brian! I found a second bug in this patch: On Fri, Jan 25, 2019 at 5:23 PM Brian Masney <masneyb@xxxxxxxxxxxxx> wrote: > - npins = platform_irq_count(pdev); (...) > - pctrl->npins = npins; Do not lose this assignment of pctrl->npins. pctrl->npins is used further down in the code and the gpiochip does not probe because of zero pins. You could get rid of the local variable npins and just use pctrl->npins everywhere though. Yours, Linus Walleij