On Fri, Sep 22, 2023 at 09:47:07PM +0100, Bryan O'Donoghue wrote: > On 22/09/2023 16:11, Stephan Gerhold wrote: > > Follow the example of the recently added apq8016-sbc-usb-host.dtso and > > convert apq8016-sbc-d3-camera-mezzanine.dts to a DT overlay that can be > > applied on top of the apq8016-sbc.dtb. This makes it more clear that > > this is not a special type of DB410c but just an addon board that can > > be added on top. > > > > I also prepended a patch that cleans up the node names a bit. > > > > Signed-off-by: Stephan Gerhold <stephan@xxxxxxxxxxx> > > --- > > Stephan Gerhold (2): > > arm64: dts: qcom: apq8016-sbc-d3-camera: Use more generic node names > > arm64: dts: qcom: apq8016-sbc-d3-camera: Convert to DT overlay > > > > arch/arm64/boot/dts/qcom/Makefile | 5 +++-- > > ...nine.dts => apq8016-sbc-d3-camera-mezzanine.dtso} | 20 ++++++++++++++------ > > 2 files changed, 17 insertions(+), 8 deletions(-) > > --- > > base-commit: 7236e86ce5c8198b01c30933c2334d07d877cf48 > > change-id: 20230922-apq8016-sbc-camera-dtso-f247bea40f99 > > > > Best regards, > > db410c doesn't ship with a bootloader that is capable of applying a dtbo > though, so this conversion mandates an updated or chainloaded bootloader or > out-of-tree kernel patch to support. > > __adding__ is fine but, converting implies imposes a new requirement on the > bootchain. > > Perhaps a middle road solution is to > > - Add, not convert a standalone dtbo or > - Add a dtbo that includes the mezzanine dts but amends it > > Option 2 for preference but, I'm not sure the dts syntax can be meaningfully > made to do that. > With these patches the apq8016-sbc-d3-camera-mezzanine.dtb is still magically built, by running fdtoverlay on apq8016-sbc.dtb and applying the dtbo. It's applied during the build process so you don't need a bootloader that supports DTBOs. There is literally *no change* for you in terms of usage. :-) Thanks, Stephan
