From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EEB8C606A31B for ; Tue, 27 Oct 2026 02:29:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=MCiv+WGr; dkim=pass (2048-bit key, unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20251104 header.b=lIVzvVf7 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Unsubscribe-Post: List-Owner; bh=/WcSLowB0b2pojOqzb24H45+MS/MsdePMGuj0DzePaw=; b=MCiv+WGrxSFsph hk1l5XfjnxD9m3IuhrjnUQbj6lJZwqfnKgjETLFpxEHZemp0p47K6fAJ/DdyHmK6UQ3KlxnQYd2Zx CU0LCaA+LrFfCbnEec+pERCKCFg7fDs5+PkL2SJstnSNk8KPOazOwoP6G98nSUjBAbZbfod8pHs6D EB9cBuVdWRxKcMPvSFoGqOraW1vPehGadJJiM+0LBRUEArZkLGQjrUiE2UPSW5LhNCEGEzfw1tbSW ZXBMEQomHgMyfUV0oAimEukjPsfWE91tS49qWWC+EqFVKuauFNoG+Y0TQTnItnC4iWMphLV2miZ3j Amiy0rF11PTXbi/TRqQw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLWv8-00000003dl4-3hRF; Tue, 27 Oct 2026 02:28:14 +0000 Received: from mail-pj1-x1033.google.com ([2607:f8b0:4864:20::1033]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLWv5-00000003dk7-1Vye for linux-arm-kernel@lists.infradead.org; Tue, 27 Oct 2026 02:28:13 +0000 Received: by mail-pj1-x1033.google.com with SMTP id 98e67ed59e1d1-3ab3f899c8aso637620a91.1 for ; Mon, 26 Oct 2026 19:28:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1793068090; x=1793672890; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=/WcSLowB0b2pojOqzb24H45+MS/MsdePMGuj0DzePaw=; b=lIVzvVf7SRtMsKuL9rwlpOTUD5gBPdpmb58UkvyoPjVzx9wcEFDQIY/4MjS+k/NY0J SEyu5lp2JYg3D3ar41D8Ev8LOIA/ZhT0BGI9HWxOt5WfD3MzCvoH2eDscWN80y9Y6RwF 5MV3H1s1VcAQqYZfhyUOI1dPSGgQEckj3Z0FLP7i4m+dY5HMVddjUiNeaAwcyOIHQHe/ WqN4kTzNfTBh805G805V03ifZ+PUYuvuca57PC7/XrosoI6wTwRRa18xkydx9rYP8yXa bL5Ty/QG5VPsp7n8HzI2gzpV+KELWjJ5euX2oNfq9tnws/5AyCIVfacwbzK40ABvqxh0 hpsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793068090; x=1793672890; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=/WcSLowB0b2pojOqzb24H45+MS/MsdePMGuj0DzePaw=; b=ES4XRjuwQiqgDpgtln2uvH+6MmqVG81BiSljliKvDQqPwI8QNEKYgUr5HIaaomHFHc fAz1QfoTbRvyje39TwQbd6qWkcO1lpjHnrA4rYibWHtzeacdkgFPTEzb7IciloM//Xmm vSmG7pX/Ka3psvRbyNCiB4FPGvE3WGaddBNP7LbEPZBr3Um6yPTgAefRZTzvmLZD0oCN JEWcGO49ni/j8YujkveuEQJpQ1yXH46xgxStWNikBlV/U9OKtGRHmWW+Qy8gkKWogKQF mHYKa9rajQTdrwyNBoww6uHBJQ6njk4nob/CFY7/4igjKuLUslpRQ4ScSdgBwQjVjz0d P4dQ== X-Forwarded-Encrypted: i=1; AKwUvBzZJgos/P7i5W3rUARLdm4rov5XFbvL886Yj2/WIYzLvNfSr9nsu9egAmjw4bOypMYN9HWrBMsKoO3rXAbs9gNW@lists.infradead.org X-Gm-Message-State: AFq9FYIwHGlnkmCwfgvTd68ZXwsJa6Zd8NkoQqEwnq/SDjUdth3sY2QH TvogTl2NWIBR2D6/t++PS7PV9y3EhWYxe6E0wrLOHVmbtnsDpbG25h85 X-Gm-Gg: AYBFou2XI/wXZBFX8XzgiEp0b36jNaXfQnZqYo0TL1BFCOwGvBowHEjNQ1oQ4T2mhNY WeifLFhK54A/VT4bzwgIzQmYPJF6AB2UAP4U1IQ7YrTa3yobqmB/ZuzYNMPvtxBN294+Dm4HPhJ 8cZ1/J7YkuJDlPW0/74RbGJjgJPjudKU2X5nX0XVj+5UJlYX70FCdJ1EUkVDzF7mQaLIwHGbewd pmFL3h8asDRn1va00N85IH0xnGl04uWe51Nq1qY/HjPXpxduImC44YO78SEmkN/Ekfa845jMcsQ uKFehexxAkCkppmzoP62RDilE7LDQQQt4zmbKc2U4n5oFj3Hnq3XKwAVPHkH4uKel36ZiW/SsMi WHJtKTmeVndb60Ew2WLs+cd8X4dd/9vcKNSp1JJgDNd22UZwIFbjlY5zs3Ttug+d+/gwL0XC+Ry PReo2DFKkHxLt2ibpuVroLrs13nGs0keOLWg7twiACs1qUSWKr3KTqTGX7QGEaulF66i9sBN9qV /Hq93dX8b2vRofluTpofEYIwCHUpbbRNzTjznyWmMXVI83hmCZEKVL7czLNsjnnth532iORdtTo tkqEwcLihHxzqw3cqt6jXyG9Wgr/zbn9 X-Received: by 2002:a17:90b:3dd0:b0:3ad:a84b:df1e with SMTP id 98e67ed59e1d1-3adea1af8bfmr12128791a91.1.1793068090331; 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-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261026_192811_406393_D291E2DA X-CRM114-Status: GOOD ( 15.12 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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