On Tuesday 21 October 2014 14:14:02 Alexandre Courbot wrote: > > > > We have enforced naming things for the dmaengine binding, which has > > just led to everyone calling things "rx" and "tx". My fear is that > > if we start to enforce giving a name, we'd end up with lots of > > drivers that use a "gpio-gpios" property or something silly. > > Checking the bindings is also part of the review process. Things > like "gpio-gpios" should simply not be accepted to begin with. > > This sounds like a good chance to finally land some guidelines > regarding GPIO bindings. Let's summarize the situation: > - GPIO bindings can be defined using both DT and ACPI (both interfaces > nicely abstracted by the interface introduced by this series) > - Both firmware interfaces support indexed GPIOs > - Both firmware interfaces support named GPIO properties, with an > optional index (can we absolutely take this for granted on ACPI now?) The developers working on it have said that they definitely want to be compatible with the existing bindings, so the answer to your question is yes. > - For DT bindings, both foo-gpio and foo-gpios are valid properties > for the GPIO "foo". I would like to see the documentation recommend one over the other for new bindings. Most other subsystems use the plural form even for properties that only have one entry, so I'd like to see "foo-gpios" become the canonical form for named gpio lines. Drivers that use existing bindings with the "foo-gpio" form (or worse, "foo-somethingelse" can use the same internal interface as the drivers that use name plus index. Do you see a problem using what I suggested for the combined API: __gpiod_get(dev, propname, index); // use property name plus index gpiod_get(dev, index); // use "gpios" plus index gpiod_get_named(dev, "name"); use "name-gpios" with index 0 plus all fwprop/devm/flags/of/... variations of that Arnd -- 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
