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<blockquote type="cite">Le 7 déc. 2023 à 19:51, Rob Herring <robh+dt@kernel.org> a écrit :<br>
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<div dir="ltr"><span>On Thu, Dec 7, 2023 at 2:08 AM ff <ff@shokubai.tech> wrote:</span><br>
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<blockquote type="cite"><span>Le 6 déc. 2023 à 21:42, Rob Herring <robh+dt@kernel.org> a écrit :</span><br>
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<blockquote type="cite"><span>On Tue, Dec 5, 2023 at 11:05 PM Sumit Garg <sumit.garg@linaro.org> wrote:</span><br>
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<blockquote type="cite"><span>On Tue, 5 Dec 2023 at 15:39, Krzysztof Kozlowski</span><br>
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<blockquote type="cite"><span><krzysztof.kozlowski@linaro.org> wrote:</span><br>
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<blockquote type="cite"><span>On 05/12/2023 10:45, Sumit Garg wrote:</span><br>
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<blockquote type="cite"><span>+ U-boot custodians list</span><br>
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<blockquote type="cite"><span>On Tue, 5 Dec 2023 at 12:58, Krzysztof Kozlowski</span><br>
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<blockquote type="cite"><span><krzysztof.kozlowski@linaro.org> wrote:</span><br>
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<blockquote type="cite"><span>On 05/12/2023 08:13, Sumit Garg wrote:</span><br>
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<blockquote type="cite"><span>@DT bindings maintainers,</span><br>
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<blockquote type="cite"><span>Given the ease of maintenance of DT bindings within Linux kernel</span><br>
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<blockquote type="cite"><span>source tree, I don't have a specific objection there. But can we ease</span><br>
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<blockquote type="cite"><span>DTS testing for firmware/bootloader projects by providing a versioned</span><br>
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<blockquote type="cite"><span>release package for DT bindings? Or if someone else has a better idea</span><br>
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<blockquote type="cite"><span>here please feel free to chime in.</span><br>
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<blockquote type="cite"><span>This doesn't work for you?:</span><br>
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<blockquote type="cite"><span>https://git.kernel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git/</span><br>
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<blockquote type="cite"><span>Thanks, this is certainly a good step which I wasn't aware of. Further</span><br>
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<blockquote type="cite"><span>simplification can be done to decouple devicetree source files from DT</span><br>
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<blockquote type="cite"><span>bindings.</span><br>
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<blockquote type="cite"><span>Why?</span><br>
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<blockquote type="cite"><span>I suppose you are already aware that Linux DTS files are a subset of</span><br>
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<blockquote type="cite"><span>what could be supported by devicetree schemas. There can be</span><br>
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<blockquote type="cite"><span>firmware/bootloader specific properties (one example being [1]) which</span><br>
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<blockquote type="cite"><span>Linux kernel can simply ignore. Will you be willing to add all of</span><br>
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<blockquote type="cite"><span>those DT properties to Linux DTS files and maintain them?</span><br>
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<blockquote type="cite"><span>We already added them and we already maintain them. DTS describes the</span><br>
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<blockquote type="cite"><span>hardware, not the OS-subset of the hardware.</span><br>
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<blockquote type="cite"><span>Let look at some numbers if your statement is justified or not for the</span><br>
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<blockquote type="cite"><span>example I gave:</span><br>
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<blockquote type="cite"><span>u-boot$ git grep -nr bootph-* arch/arm* | wc -l</span><br>
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<blockquote type="cite"><span>4079</span><br>
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<blockquote type="cite"><span>linux$ git grep -nr bootph-* arch/arm* | wc -l</span><br>
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<blockquote type="cite"><span>267</span><br>
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<blockquote type="cite"><span>I have no control over whether anyone has submitted the other 3812 instances.</span><br>
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<blockquote type="cite"><span>It looks like there is always going to be a catch up game regarding DT</span><br>
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<blockquote type="cite"><span>properties which either Linux kernel or u-boot or any other</span><br>
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<blockquote type="cite"><span>firmware/bootloader project don't care about.</span><br>
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<blockquote type="cite"><span>As long as dts files in u-boot are manually sync'ed, yes. That is the</span><br>
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<blockquote type="cite"><span>problem and it doesn't matter if we have a standalone repository or</span><br>
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<blockquote type="cite"><span>not.</span><br>
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<blockquote type="cite"><span>If you want to move in that direction, start automating what u-boot</span><br>
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<blockquote type="cite"><span>imports. You need to do that for bindings if you want to run</span><br>
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<blockquote type="cite"><span>validation, so why not dts files too?</span><br>
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<blockquote type="cite"><span>However, DT bindings are something which should be common, the</span><br>
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<blockquote type="cite"><span>hardware description of a device should be universal. IMO, splitting</span><br>
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<blockquote type="cite"><span>Both DT bindings and DTS should be common. I don't see the difference.</span><br>
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<blockquote type="cite"><span>If we really care about DTS to be common then the contribution model</span><br>
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<blockquote type="cite"><span>has to change where there is a single repo hosting DT bindings and</span><br>
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<blockquote type="cite"><span>DTS. All other projects whether it is Linux kernel or u-boot or any</span><br>
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<blockquote type="cite"><span>other OS/firmware/bootloader are just consuming DTS files from that</span><br>
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<blockquote type="cite"><span>Really, only the kernel and u-boot matter. No, I don't mean I don't</span><br>
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<blockquote type="cite"><span>care about other projects, but those are the 2 with the widest h/w</span><br>
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<blockquote type="cite"><span>support by far and which have a major effort to sync copies of dts</span><br>
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<blockquote type="cite"><span>files in both projects. The rest are just noise in terms of this</span><br>
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<blockquote type="cite"><span>problem.</span><br>
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<blockquote type="cite"><span>I suppose this is something that Linux DT maintainers</span><br>
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<blockquote type="cite"><span>have objected to in the past for ease of maintenance. I am not sure if</span><br>
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<blockquote type="cite"><span>you folks are willing to change that stance.</span><br>
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<blockquote type="cite"><span>The issue is no one steps up to help maintain such a repository while</span><br>
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<blockquote type="cite"><span>there is lots of review and maintainer work on what goes into the</span><br>
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<blockquote type="cite"><span>kernel tree. I'm happy to direct my binding review attention to</span><br>
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<blockquote type="cite"><span>wherever the majority of the bindings go. But the work on the DTS side</span><br>
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<blockquote type="cite"><span>Assume for a minute we have this standalone repo. What happens next?</span><br>
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<blockquote type="cite"><span>We start with an empty repo and then merge and move platforms 1 by 1?</span><br>
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<blockquote type="cite"><span>What about leveraging SystemReady-IR compliant board maintainers and start with a core of motivated people ?</span><br>
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<span>I think there are 2 ATM. Synquacer and i.MX8 variants.</span></div>
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Based on </span><a href="https://www.arm.com/architecture/system-architectures/systemready-certification-program/ir">https://www.arm.com/architecture/system-architectures/systemready-certification-program/ir</a><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"> </span>
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"> roughly 30 boards.</div>
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<div dir="ltr"><span>Synquacer only</span><br>
<span>has a DT in u-boot, so not really anything to do there.</span></div>
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<div dir="ltr"><span>I'm pretty</span><br>
<span>sure the certified DTBs for i.MX8 don't match what's in u-boot or the</span><br>
<span>kernel tree. Hopefully, it's just a subset, but still, there's a gap.</span><br>
<span>I don't know that there is motivation there either.</span><br>
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<div dir="ltr"><span>Note that SystemReady currently only requires every node with</span><br>
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<span>warnings. If we went with a 1 by 1 approach, I would push that</span><br>
<span>platforms have to be free of warnings.</span><br>
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<blockquote type="cite"><span>How many years will that take?</span><br>
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<blockquote type="cite"><span>Should all platforms following that organization be a goal?</span><br>
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<span>You mean should all platforms be moved? Absolutely. I don't think we</span><br>
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Actually, if we limit he DTS in the third place for SystemReady-IR, there should be no DTB in the Linux distribution. It would be the equivalent as ACPI boards . So is it still an issue ? A reference to the the third repo may be hinted in a text file.</div>
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<div dir="ltr"><span>I don't really think 1 by 1 is the right approach. I was just</span><br>
<span>enumerating how this could work. It's not that useful to say we need a</span><br>
<span>standalone repo without working thru the logistics of how exactly that</span><br>
<span>will work.</span><br>
<span></span><br>
<span>Rob</span><br>
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