+Masahiro Yamada too
On Wed, 13 Dec 2023 at 01:22, Geert Uytterhoeven <ge...@linux-m68k.org> wrote: > > Hi, > > On Tue, Dec 12, 2023 at 4:52 PM Andrew Davis <a...@ti.com> wrote: > > On 12/12/23 8:05 AM, Simon Glass wrote: > > > The devicetree files for a board can be quite large, perhaps around > > > 60KB. To boot on any supported board, many of them need to be > > > provided, typically hundreds. > > > > > > All boards for a particular SoC share common parts. It would be > > > helpful to use overlays for common pieces, to reduce the overall size. > > > > > > > For this to save much size we would need to have the SoC split > > from each board that uses it. We don't have that in DT today. > > There are some efforts in progress to help on this but until > > then we will not get much here. > > Indeed. > > E.g. The Kingfisher board[1] is an extension for (various) ULCB > boards[2], but we cannot use an overlay for the former, as the > combinations need to have different top-level compatible (and model) > values. Hence currently we use a .dtsi file and lots of extra .dts > files[3]. > > The other issue is the need for parameterization, due to slight > differences in pins/signals on various base boards, or because the > same connector is present multiple times (e.g. for multi-camera > setups[4][5]). > > [1] arch/arm64/boot/dts/renesas/ulcb-kf.dtsi > [2] arch/arm64/boot/dts/renesas/*-ulcb.dts > [3] arch/arm64/boot/dts/renesas/*-ulcb-kf.dts > [4] arch/arm/boot/dts/renesas/r8a7742-iwg21d-q7-dbcm-ov5640-single.dtsi > [5] arch/arm/boot/dts/renesas/r8a7742-iwg21d-q7-dbcm-ov7725-single.dtsi > > Gr{oetje,eeting}s, > > Geert > > -- > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- > ge...@linux-m68k.org > > In personal conversations with technical people, I call myself a hacker. But > when I'm talking to journalists I just say "programmer" or something like > that. > -- Linus Torvalds