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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=FlJf5Sm0; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9AC57606A339; Wed, 21 Oct 2026 11:53:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=FlJf5Sm0 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 569431F000C4; Wed, 21 Oct 2026 11:53:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792583607; bh=jdd3bJ+yNAjfZcHwgMNPA9q+vTcn5By3FrVNym33ods=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=FlJf5Sm0BhjhwPXy9OrGDtK8DK5nsqmh9sSfl25F9w8b9SXiiAhvAohb2cX9zWBVo 4jgtReFAkqMr/TmP6iyE1WhLLmtvh1A8ocRBg9u+qWdEKedCHTft+PGNceSlXKO38C tBI45DYgnXwSA+WYO49agoTHkYmfzeGTr6admgsyiNFArbdQvuffOehnPgg/KqS7Y8 yzqJRup3012rrc9ppyd/g6qrVddBfO11UGIzAtycWnQ2w7oIHBYDM18pbM+3cAihJ+ iqehmM/w7buP3S4jDQQ1A02UU58mIOXg7b7xrM0hibmzMbzcZNSxdS/XVL12wScoh2 Dsn+FwC16X6kA== Message-ID: <565fd4c2-2d5a-4c2a-9ed1-c7bcb17efc9d@kernel.org> Date: Wed, 21 Oct 2026 13:53:17 +0200 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 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/13] dt-bindings: display: msm: Document the Nord DiplayPort controller To: Nabige Aala Cc: Vinod Koul , Neil Armstrong , Manivannan Sadhasivam , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Kuogee Hsieh , Shawn Guo , linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, Ritesh Kumar , Mahadevan P References: <20261012-nord-drv-dt-v2-0-a2ab9af954d2@oss.qualcomm.com> <20261012-nord-drv-dt-v2-2-a2ab9af954d2@oss.qualcomm.com> <20261013-tangible-wakeful-swift-a38f8f@quoll> <20261013-honored-bear-of-cleaning-bd8108@quoll> <425ddb41-cfd7-4032-8666-0193ab6b5819@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 21/10/2026 13:16, Nabige Aala wrote: > > On 10/13/2026 2:18 PM, Krzysztof Kozlowski wrote: >> On Tue, Oct 13, 2026 at 09:44:15AM +0200, Krzysztof Kozlowski wrote: >>> On Mon, Oct 12, 2026 at 07:02:12PM +0530, Nabige Aala wrote: >>>> From: Mahadevan P >>>> >>>> Nord uses MDSS 12.1 with two independent DP controller instances, >>>> each exposing two DP cores at new IO offsets. None of the existing >>>> compatibles match this layout, so add qcom,nord-dp. >>>> >>>> Signed-off-by: Mahadevan P >>>> Signed-off-by: Nabige Aala >>> Do I understand correctly: >>> Device is fully compatible with qcom,sa8775p-dp, but a simple to fix >>> driver limitation is preventing compatibility? >>> >>> If so, let's fix the driver - just add more addresses to the >>> msm_dp_desc_sa8775p array? >> Or it does not matter, because top-level MDSS anyway cannot use >> compatibility? > > For MDSS0, the DP register offsets are same to those used on SA8775P. > However, the MDSS1 DP register offsets differ from SA8775P, and Nord > also utilizes a different MDSS instance. Because of these differences, > we introduced a separate compatible string for Nord. > > Are you suggesting that Nord should reuse the "msm_dp_desc_sa8775p"?  > This would also pollute the sa8775p's desc table. What are the differences? Only registers, so no pollution. You just need them to match IDs. Best regards, Krzysztof