On Mon, Jan 22, 2024 at 11:45:15AM +0000, Andre Przywara wrote: > On Wed, 10 Jan 2024 16:05:36 +0530 > Sumit Garg <sumit.g...@linaro.org> wrote: > > Hi, > > I certainly welcome this more automatic synchronisation of the DTs, > however have one comment about the upcoming sync process: > > > ... > > However, Linux kernel DT maintainers proposed [2] for U-Boot to rather > > use devicetree-rebasing repo [3] which is a forked copy from Linux > > kernel for DT source files as well as bindings. It is tagged at every > > Linux kernel major release or intermideate release candidates. So here I > > have tried to reuse that to bring DT bingings compliance as well as a > > standard way to maintain a regular sync of DT source files with Linux > > kernel. > > > > In order to maintain devicetree files sync, U-Boot will maintains a Git > > subtree for devicetee-rebasing repo as `dts/upstream` sub-directory. > > U-Boot will regularly sync `dts/upstream/` subtree whenever the next window > > opens with the next available kernel major release. > > I hope this doesn't need to stay that restricted? Can we either sync more > often, or at least on the kernel's -rc1, and not only on a "full" release? > > The reason I ask is that we have a chicken-egg problem here: without a DT > merged into the kernel tree, no U-Boot board support can be merged. And > without U-Boot support, we cannot boot a kernel, at least not in the > canonical way. > > Since the U-Boot and kernel merge windows are not in phase, for sunxi I try > to sync the kernel DTs either as early as possible (-rc1, sometimes even > before, when the maintainers have merged them into their tree), or > sometimes "out of season", if a board defconfig patch is coming up. > > Otherwise new board support, which typically has a very low regression risk > for the rest of the code base, would need to be delayed until the next > release. In the worst case the U-Boot merge windows opens one week before > a kernel release, then new boards need to wait three months?
Would it be to bad to bring in board X with OF_UPSTREAM=n for one U-Boot release, and then with the next one switch to OF_UPSTREAM=y (and delete the dts from arch/) for the next release, when we would have gotten back in sync? -- Tom
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