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Mon, 26 Oct 2026 19:28:10 -0700 (PDT) Received: from localhost.localdomain ([240e:36d:b08:2bc0::a60]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3adeba38910sm6823109a91.1.2026.10.26.19.28.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Oct 2026 19:28:09 -0700 (PDT) From: Jianfeng Liu To: heiko@sntech.de Cc: HystericalDragons@proton.me, amadeus@jmu.edu.cn, conor+dt@kernel.org, devicetree@vger.kernel.org, hrushirajg23@gmail.com, krzk+dt@kernel.org, krzk@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, liujianfeng1994@gmail.com, macromorgan@hotmail.com, michael.opdenacker@rootcommit.com, naoki@radxa.com, robh@kernel.org Subject: Re: [PATCH 1/3] dt-bindings: arm: rockchip: Add ArmSoM Sige7s Date: Tue, 27 Oct 2026 10:28:01 +0800 Message-ID: <20261027022801.377819-1-liujianfeng1994@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <5520293.6fTUFtlzNn@phil> References: <5520293.6fTUFtlzNn@phil> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 >> 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. The shared dtsi ensures that we do not duplicate the hardware description, with the two board DTS files differing only in model and compatible. Would this be a reasonable justification for keeping a separate board DTS? Best regards, Jianfeng