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They purchased the original CoolPi 4B >>> hardware design from CoolPi and confirmed that no hardware design >>> modifications were made for the Sige7s. >>> >>> So the Sige7s uses the same hardware design as the CoolPi 4B, rather >>> than being independently designed. >> >> if it's the completely same board, just with a different print on >> the board, why does it need an empty devicetree. When it's completely >> unchanged, what's speaking against just re-using the original one? > > The existing CoolPi 4B DTB does work on the Sige7s, and I agree that there > is no hardware difference requiring a separate device tree. > > My main reason for adding a separate DTS is to preserve the Sige7s board > identity for long-term upstream support. > > The CoolPi 4B appears to be discontinued and is no longer readily available > through the purchase channels listed on its official website > (https://www.cool-pi.com/buy/). In contrast, ArmSoM is actively selling the > Sige7s and has committed to producing it until at least January 2034. > > I'm also planning to add mainline U-Boot support for the Sige7s and > integrate it with Stubble-based UEFI booting. > I am not sure I want this in U-Boot. Why should we have add a defconfig (and thus increase the CI build time) for a device that's already entirely covered by another defconfig? I guess the Linux kernel doesn't care about this so we don't need to discuss this here. > While U-Boot could update the model and compatible properties before > booting Linux, Stubble may replace the firmware-provided DTB with one > bundled with the kernel. Having a Sige7s-specific DTB would preserve the > correct board identity throughout this process without requiring additional > distribution-specific modifications. > From U-Boot's perspective, I would have preferred there be a simple difference we can detect at runtime and based on that decide which device tree to load between coolpi-4b and armsom-sige7s. > This would also avoid confusing users who purchase a Sige7s but find their > system identified as a CoolPi 4B. > > The shared dtsi ensures that we do not duplicate the hardware description, > with the two board DTS files differing only in model and compatible. > I don't know Heiko's or Krzysztof's opinion here, but I think it would better reflect the actual context to NOT use a dtsi and simply have arch/arm64/boot/dts/rockchip/rk3588s-armsom-sige7s.dts include arch/arm64/boot/dts/rockchip/rk3588s-coolpi-4b.dts and update the model and compatible properties. Cheers, Quentin