[patch 0/7] dt: dtb version: add version info to dtb

Frank Rowand
2015-03-19T17:05:23Z

On 3/19/2015 1:12 AM, Gregory CLEMENT wrote:
> Hi,
>
> On 19/03/2015 04:29, Frank Rowand wrote:
>> Rob,
>>
>> Can this be added to the next trees to get some test exposure before submitting
>> to Linus?
>>
>> There is currently no way to tie a device tree blob (DTB) back to the source
>> and environment used to create it. Add this information, including a DTB
>> version number, which is somewhat analogous to the Linux kernel version number.
>>
>> The DTB version number is independent of the kernel version number, and is
>> incremented for each make of one or more DTBs.
>>
>> The DTB information is placed in node /chosen/dtb-info. The data for this
>> node will be automatically generated by the .dtb make system for any .dts
>> that includes arch/arm/boot/dts/skeleton.dtsi, either directly or indirectly.
>> This means that architectures other than arm will not receive this feature.
>> This can be added to other architectures by modifying their skeleton.dtsi.
>>
>> There are 70 of the 557 arm .dts files that do not include skeleton.dtsi.
>> Thus the .dtb files created for these systems will not have the
>> /chosen/dtb-info node:
>
> About the following list some of them use skeleton64.dtsi instead of
> skeleton.dtsi. All the armada-xp-*.dts uses it and also axm5516-amarillo.dts
> (through axm55xx.dtsi), the ls1021a-*.dts, the mt8127-moose.dts, the
> mt8135-evbp1.dts and the sun9i-a80-optimus.dts.
>
> So maybe it would worth updating skeleton64.dtsi.

Thanks for noticing that! I'll add skeleton64.dtsi.

>
> For the other ones it seems that actually they use skeleton.dtsi but not
> through a dtsi file.

I'll go check again.

>
> Thanks,
>
> Gregory
>
>
>>
>> armada-xp-axpwifiap.dts
>> armada-xp-db.dts
>> armada-xp-gp.dts
>> armada-xp-lenovo-ix4-300d.dts
>> armada-xp-matrix.dts
>> armada-xp-netgear-rn2120.dts
>> armada-xp-openblocks-ax3-4.dts
>> armada-xp-synology-ds414.dts
>> atlas6-evb.dts
>> atlas7-evb.dts
>> axm5516-amarillo.dts
>> bcm2835-rpi-b-plus.dts
>> bcm2835-rpi-b.dts
>> ea3250.dts
>> ecx-2000.dts
>> highbank.dts
>> hip04-d01.dts
>> integratorap.dts
>> integratorcp.dts
>> ls1021a-qds.dts
>> ls1021a-twr.dts
>> meson6-atv1200.dts
>> moxart-uc7112lx.dts
>> mt8127-moose.dts
>> mt8135-evbp1.dts
>> nspire-clp.dts
>> nspire-cx.dts
>> nspire-tp.dts
>> phy3250.dts
>> picoxcell-pc7302-pc3x2.dts
>> picoxcell-pc7302-pc3x3.dts
>> prima2-evb.dts
>> r7s72100-genmai.dts
>> r8a73a4-ape6evm-reference.dts
>> r8a73a4-ape6evm.dts
>> r8a7790-lager.dts
>> r8a7791-henninger.dts
>> r8a7791-koelsch.dts
>> r8a7794-alt.dts
>> spear1310-evb.dts
>> spear1340-evb.dts
>> spear300-evb.dts
>> spear310-evb.dts
>> spear320-evb.dts
>> spear320-hmi.dts
>> spear600-evb.dts
>> stih407-b2120.dts
>> stih410-b2120.dts
>> stih415-b2000.dts
>> stih415-b2020.dts
>> stih416-b2000.dts
>> stih416-b2020.dts
>> stih416-b2020e.dts
>> stih418-b2199.dts
>> sun9i-a80-optimus.dts
>> vexpress-v2p-ca15-tc1.dts
>> vexpress-v2p-ca15_a7.dts
>> vexpress-v2p-ca5s.dts
>> vexpress-v2p-ca9.dts
>> vt8500-bv07.dts
>> wm8505-ref.dts
>> wm8650-mid.dts
>> wm8750-apc8750.dts
>> wm8850-w70v2.dts
>> xenvm-4.2.dts
>> zynq-parallella.dts
>> zynq-zc702.dts
>> zynq-zc706.dts
>> zynq-zed.dts
>> zynq-zybo.dts
>>
>>
>>
>> An example of the DTB information reported is:
>>
>> $ echo ; cat /proc/version; echo ; echo ; dmesg | grep DTB
>>
>> Linux version 4.0.0-rc4-dirty (frank at buildhost) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #5 SMP PREEMPT Wed Mar 18 20:04:48 PDT 2015
>>
>>
>> DTB version 4.0.0-rc4-dirty (frank at buildhost) (DTC 1.4.0-dirty) #4 Wed Mar 18 20:04:11 PDT 2015
>> DTB linux version 4.0.0-rc4-dirty (frank at build_host) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #3 SMP PREEMPT Wed Mar 18 20:02:46 PDT 2015
>> DTB source /local/nobackup/src/git_linus/linux--4.0/arch/arm/boot/dts/qcom-apq8074-dragonboard.dts
>> DTB blob arch/arm/boot/dts/qcom-apq8074-dragonboard.dtb
>>
>>
>> The values of the /chosen/dtb-info/ properties are also available in
>> /proc/device-tree/chosen/dtb-info/
>> --
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>
>