Messages in this thread | | | Subject | Re: [PATCH 7/7] ARM: dts: sun7i: Add dts file for the A20-linova1-7 HMI | From | Sergey Suloev <> | Date | Sat, 5 May 2018 00:59:07 +0300 |
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Hi, Giulio,
On 05/05/2018 12:52 AM, Giulio Benetti wrote: > Hi Maxime! > > Il 04/05/2018 10:06, Maxime Ripard ha scritto: >> Hi, >> >> On Wed, May 02, 2018 at 06:41:34PM +0200, Giulio Benetti wrote: >>>>> You don't have to handcode the fragments anymore with the new syntax, >>>>> and U-Boot makes it really trivial to use if you use the FIT image >>>>> format to have multiple overlays bundled in the same image. You can >>>>> choose to apply them dynamically, for example based on an EEPROM or >>>>> some other metric to see which combination you have. >>>> >>>> Ah, this is interesting. I'm going to experiment with that. >>>> >>> >>> I'm struggling against this, I don't really know how to proceed, >>> except keeping monolithic dts files including other dtsi files. >>> >>> About dt-overlays I've tried to look around lot of time, >>> but the only thing I've found is this: >>> https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git/tree/arch/arm/boot/dts?h=topic/renesas-overlays >>> >>> >>> where they use .dtso tagging them as "/plugin/;" >>> and compile all .dtso found in dts folder. >>> Then they obtain .dtbo files that should be the dt-overlays we have >>> spoken >>> about right? >> >> Yes. You don't have to do that though, you can just rely on dtc to >> compile them, outside of the linux build system. >> >>> What I can't understand is if there's a real standard at this time to >>> follow, because on renesas-driver they use their way to handle all >>> .dtso >>> files, but on mainline there seems to be nothing about that. >> >> I'm not sure what you mean here. It's just fragments of device tree, >> that have to be compiled using dtc, that's it. You can use the Linux >> build system infrastructure to do that, or you can build your own >> simpler one. That's really up to you. See for example >> https://github.com/NextThingCo/CHIP-dt-overlays/blob/master/Makefile >> >> (even though the overlays themselves use the legacy syntax and >> shouldn't really be used an examples) > > Everything works now! > Thank you very much! > I've setted up a Repo on Github to give an example on how make it work > with no pain: > https://github.com/micronovasrl/linova-dtoverlays > > At the moment it's a mess all around, but it's working and give an > idea on how to make it work. Though I'm going to clean it up well as a > base for linova dtoverlays. > > Ah, btw, can you confirm me that base dts file must be compiled > outside kernel with: > dtc -@ .... > Otherwise as in-tree dts with make dtbs "-@" argument is not passed. > Right? > > Thank you a lot for your help and time again! > > Best regards! > I'd highly recommend you to look at Armbian overlay support: it is easy and elegant.
https://github.com/armbian/build/blob/master/patch/kernel/sunxi-next/add-overlay-compilation-support.patch
https://github.com/armbian/build/blob/master/patch/kernel/sunxi-next/add-sunxi-overlays.patch
Sergey
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