Re: [PATCH 1/3] dt-bindings: arm: rockchip: Add ArmSoM Sige7s

[Krzysztof Kozlowski]

On Tue, Oct 27, 2026 at 10:28:01AM +0800, Jianfeng Liu wrote:
> Hi Heiko,
> 
> On 2026-10-26 11:43 UTC, Heiko Stuebner wrote:
> >> I confirmed this with ArmSoM. They purchased the original CoolPi 4B
> >> hardware design from CoolPi and confirmed that no hardware design

"no hardware design modifications" is quite different than what commit
msg said "based on".

> >> 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.
> 
> 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.
> 
> This would also avoid confusing users who purchase a Sige7s but find their
> system identified as a CoolPi 4B.

Maybe just install the DTB under new name if they are identical?

Best regards,
Krzysztof