On Thu, Mar 31, 2016 at 11:27 AM, Rob Herring <robh+dt@xxxxxxxxxx> wrote: > On Wed, Mar 30, 2016 at 11:15 AM, Joachim Eastwood <manabian@xxxxxxxxx> wrote: >> Hi Mark, >> >> On 30 March 2016 at 15:41, Mark Rutland <mark.rutland@xxxxxxx> wrote: >>> On Wed, Mar 30, 2016 at 04:06:56PM +0300, Vladimir Zapolskiy wrote: >>>> On 30.03.2016 14:06, Mark Rutland wrote: >>>> > On Wed, Mar 30, 2016 at 12:30:41AM +0200, Joachim Eastwood wrote: >>>> >> Add unit name to memory to remove the following warning: >>>> >> Warning (unit_address_vs_reg): Node /memory has a reg or ranges >>>> >> property, but no unit name >>>> > >>>> > If anything, it would be better to get rid of the memory node from the >>>> > skeleton DTs. >>>> > >>>> > For DTs which have a memory node there's no problem, and DTs which >>>> > expect a bootlaoder to fill things in have a logical place to document >>>> > that fact. >>> >>>> The only problem I see if DTB is updated on a board but a board bootloader >>>> on fix-up is capable to fill a preexisting "/memory" device node in only, >>>> otherwise it is not clear why the device node is present in skeleton.dtsi. >>> >>> Sure. To clarify the above, what I expect that for this case is that the >>> empty memory node would exist in the dts for that particular board, >>> along with a comment, e.g. >>> >>> /* The firmware/bootloader for $BOARD fills this in */ >>> memory { >>> device_type = "memory"; >>> reg = <0 0 0 0>; >>> }; >> >> To avoid the warning with the new dtc this would need to be memory@0. > > Except memory is probably not actually at 0 here. This has come up > before and been beaten to death. Bottom line is plain "memory" is > allowed, and I plan to add that exception to dtc. > >>> That way you can tell at a glance that the lack of memory information in >>> the DT for a board is intentional, and the bootloader still gets the >>> node it expects. >> >> >> But this doesn't seem to be a "problem" with any of the DTs in >> arch/arm/boot as they all defined a memory node. >> >> I used the following script to check for the memory node in all built dtb's. >> make ARCH=arm CONFIG_OF_ALL_DTBS=y dtbs >> for i in $(ls arch/arm/boot/dts/*.dtb); do >> m=$(scripts/dtc/dtc -I dtb -O dts $i | grep -m1 'memory.*{') >> if [ -z "$m" ]; then >> echo "Missing memory node in $i" >> fi >> done >> >> So it should be pretty safe to just remove the memory node entry in >> the skeleton files. Unless I have missed something with the script >> above. > > You've got to make sure they have 'device_type = "memory";' which they > could rely on inheriting. BTW, you could add this as a check to dtc and then it will find all the missing ones for you. Rob -- 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