On Mon, Aug 6, 2018 at 10:53 AM Robert P. J. Day <rpjday@xxxxxxxxxxxxxx> wrote: > > > section 2.3.5 of the spec seems contradictory: > > "The #address-cells and #size-cells properties are not inherited from > ancestors in the devicetree. They shall be explicitly defined. > > "A DTSpec-compliant boot program shall supply #address-cells and > #size-cells on all nodes that have children. That should be amended to "... that have children with 'reg' property". > "If missing, a client program should assume a default value of 2 for > #address-cells, and a value of 1 for #size-cells." > > those first two sentences clearly imply that those properties *must* > be explicitly defined, while the immediately following sentence allows > a client program to fill them in if they're missing. that seems > confusing. I'd guess the last sentence was put there because there were DT's in the wild which didn't have the properties. We can probably remove the last sentence. dtc has had a warning for this for ages. Interestingly, this isn't even the defaults the kernel uses. Both are 1 for all but Sparc. Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree-spec" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
