On 25/08/16 23:04, Linus Walleij wrote: > On Wed, Aug 24, 2016 at 11:29 PM, Jonathan Cameron <jic23@xxxxxxxxxx> wrote: >> Gregor: >>> So I feel like we should keep away from any temptation to define the coordinates >>> system too strictly. >>> I also think of systems composed of multiple hardware parts with sensors >>> scattered all over them. What would be the right "device/main hardware" reference >>> frame definition in these cases ? >>> As this is product specific, I feel like "device/main hardware" reference frame >>> definition should be left to the "board/main hardware/device..." implementor's >>> choice. >> >> Flexible is good, but I think we should define a base rule for the chips frame >> of reference and fix up any that disagree (which is nasty ABI breakage :( >> Trivial choice of either right handed or left handed frame might be all we >> define in general. Useful to define consistent frames for device types that >> are common perhaps as well. (such as the screen ones Linus has here). > > Admittedly I come from the mobile phone industry. > > So these frames of reference is not cooked up by me, I installed the > Android app "Sensors test" to test two devices relative the world, so this > is the frame of reference used by all mobile phones and tablets on the > planet (I hardly think iPhone deviates). > > I would be happy to write explicitly that for human interaction devices > with screens that frame of reference should always be assumed, but for > other uses and device types other frames of reference may apply, would > you agree? Absolutely. The references Gregor gave might also be worth mentioning as they provide pretty pictures etc ;) Jonathan > > Yours, > Linus Walleij > -- > To unsubscribe from this list: send the line "unsubscribe linux-iio" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
