On Tue, Oct 31, 2017 at 2:16 PM, Andrew Lunn <[email protected]> wrote: >> The discussion here is interesting, it is customary for GPIO drivers >> to implement double-edge detection emulation by swapping the >> edge detector around like this. > > Hi Linus > > I was not aware this was customary. > >> It might be possible to collect some generic information about >> this in the Documentation/gpio/driver.txt document. > > Yes, i think it should be documented somewhere. Even in the use case > here, detecting an SD card being inserted/removed, you could get some > bounce on the microswitch, miss an edge, and be in the wrong state.
Indeed :/ This is I guess why it is a good idea to combine this with the debounce feature if the hardware supports it. I'll think about some writeup. Yours, Linus Walleij
