From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792584505; b=5Jb6Wp/iajyyTrvvyZlBYwXf0dVEYiftDb/VHJJJ+kgTmMiT6pECMKv9Ssj8cwRDLwOY LcQf/R6vJQYFeo6g+Z7NcRm/NdHtscUvftTaO9SnICu+WVpiEuEH0DK6xaVrt+Zi0BogV ceq+GybU4td+Ss/Ljgxj7qbhXkFjcQiZZgiwlPAFl0ip5O2aMSLARcksqubSzYS/6FoyQ oP4imPlwp7c767OisxaDAdPycdYv7c99Fm0NFq2T64+dP8C021yDsV8xLb0WwlPReNJEI IQCA8sn8bUjiDubh7K1pvFkdWn0OUdwChH683NIfBD9z95dp9uMT+R1vM37Nib+QLZg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792584505; h=Received:DKIM-Signature:Message-ID:Date:MIME-Version:User-Agent: Subject:To:Cc:References:From:Content-Language:Autocrypt:In-Reply-To: Content-Type:Content-Transfer-Encoding; bh=qc9sPLphgZ7QSWhmy8R5+v9PeXT7acWu+WtEs/0esaA=; b=KuQXiqM/rFn7TA/rnI4GJ4Sx3ktenA9/LZAM1Oh+olXPdMqg1sgj2ZBQM5BRUmzprfRK SL993SJghum0jPpDNQE/uXOGr2nE8L6VZ7UJHqORFz1A6jqMvZTLM/39QfCXhCMSbvH4c tDcLloUHy3yC3+Dg0IUaAc0GR5Nm6XeJG9AacuNQBrTTG43TplpCdTDpJbtR8aqFm5jiY VuJton5dcQ7+OtpcEy2RDQKeLQbv3qw8xDVP2iRQd6Hrh9cRNVx9SXNGQqfvOh4YHrAde WdXj6vAe/kYSIKuqZAsnbl77SOiBs7OfksoMDcHBFYNglG7Cjo/3e7DaEhmA3WDt3ng== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Vq786MKU; 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 B02FF606A319; Wed, 21 Oct 2026 12:08:24 +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=Vq786MKU Received: by smtp.kernel.org (Postfix) with ESMTPSA id B54DA1F000C4; Wed, 21 Oct 2026 12:08:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792584504; bh=qc9sPLphgZ7QSWhmy8R5+v9PeXT7acWu+WtEs/0esaA=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Vq786MKURiKZ5k195eYF07FNPCGCfvd89jSJNH3in6w/tygog5IdgOCbphRK47a3y nq2r9wBK0Q5wGA9WS1mjHSDRLwvgtpSEWxAAc57z5qasBi5mYcqrKvmcyHNQHtXGDy 54RDsqbsH2SNzl9Z3sK1tE7/bn2D7m+k6K9J431YSbro75H1sAW0+ddHJuGQNp0CGD tPogXKa63owmZOjUakOpW6tF1pOBFTOqaZ768yZMN8bHDheXTILfT7W6K6pnnsbSpw nQcnqt1YSzybetkJc+PFQ+o8MmKAFtLg3jC6IslmNI0Ly8f7PDgJvRI8Nhnve6KEdF Hh60LjJjFnmBg== Message-ID: <95d92a33-df2e-48b4-a2ff-89b00a61aa89@kernel.org> Date: Wed, 21 Oct 2026 14:08:13 +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> <565fd4c2-2d5a-4c2a-9ed1-c7bcb17efc9d@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; keydata= xsFNBFVDQq4BEAC6KeLOfFsAvFMBsrCrJ2bCalhPv5+KQF2PS2+iwZI8BpRZoV+Bd5kWvN79 cFgcqTTuNHjAvxtUG8pQgGTHAObYs6xeYJtjUH0ZX6ndJ33FJYf5V3yXqqjcZ30FgHzJCFUu JMp7PSyMPzpUXfU12yfcRYVEMQrmplNZssmYhiTeVicuOOypWugZKVLGNm0IweVCaZ/DJDIH gNbpvVwjcKYrx85m9cBVEBUGaQP6AT7qlVCkrf50v8bofSIyVa2xmubbAwwFA1oxoOusjPIE J3iadrwpFvsZjF5uHAKS+7wHLoW9hVzOnLbX6ajk5Hf8Pb1m+VH/E8bPBNNYKkfTtypTDUCj NYcd27tjnXfG+SDs/EXNUAIRefCyvaRG7oRYF3Ec+2RgQDRnmmjCjoQNbFrJvJkFHlPeHaeS BosGY+XWKydnmsfY7SSnjAzLUGAFhLd/XDVpb1Een2XucPpKvt9ORF+48gy12FA5GduRLhQU vK4tU7ojoem/G23PcowM1CwPurC8sAVsQb9KmwTGh7rVz3ks3w/zfGBy3+WmLg++C2Wct6nM Pd8/6CBVjEWqD06/RjI2AnjIq5fSEH/BIfXXfC68nMp9BZoy3So4ZsbOlBmtAPvMYX6U8VwD TNeBxJu5Ex0Izf1NV9CzC3nNaFUYOY8KfN01X5SExAoVTr09ewARAQABzSVLcnp5c3p0b2Yg S296bG93c2tpIDxrcnprQGtlcm5lbC5vcmc+wsGPBBMBCgA5AhsDBgsJCAcDAgYVCAIJCgsE FgIDAQIeAQIXgBYhBJvQfg4MUfjVlne3VBuTQ307QWKbBQJp2mE8AAoJEBuTQ307QWKbeaIP /ihHTkTW4KsN/DQ945JJbyu5tI0J80Wue7QyyLPglyKfhgb5cLLNPpOC8cCIJsc7+W3i2P38 s2c1cOH6CYGE7E9ur3Vfme8NW2S2I/Z8VC7bZnzyS23wT17LrsdS/qCpx4o8U+pt/xdXDKph EGRYrIEmMpUWvyYzyYKGIe25FtaayIIKpq8eZYyFcp2f/sG5IkOW5uZzHPMPdcm87jU7fyuQ rAU2vx9r+ulUfQ/q9Z2roC/ode3l7t2pN7BCBCsUDp6JCrUyZrtT1e7EbA0ZRP3aOBNk2P2E DQOgJGjGdO5Yx2Y9LFtltu6JbsBJHi1syGRX3AtQYOMc4Y1WGoeZJmMlvKj2ZqqXNkcWi2DS IQEWB0uW6CqFsBBIMGDa+6OzdaVO/uAVXWDWml02Men3CILdI1MbVjoh8ECqYUY7OQ+JJvNN vnliuq5WM3Ghd3jg/LZZrxXjdIginRHFQCjIJYLKpLZWm1/iDFedcfzqRNYmTtqscdCNHW41 oT3Z7BmO9xwdjuwBS6nmS6JJwkbf5Ot2QR4pB/DRU7ZwjT1qHe+9r9gF32wXVQatHNGK/VVu sfwOnkdxCWkp/qb2gdQRmZh+SedStWshigH6sNfuHBloF/q+hjMRc8b2m326OZdrbSHwY1Sz vti8Hn7n8NjdHO9LKB7BIdjkA9DA5WsqOuVCzsFNBFVDXDQBEADNkrQYSREUL4D3Gws46JEo Z9HEQOKtkrwjrzlw/tCmqVzERRPvz2Xg8n7+HRCrgqnodIYoUh5WsU84N03KlLueMNsWLJBv BaubYN4JuJIdRr4dS4oyF1/fQAQPHh8Thpiz0SAZFx6iWKB7Qrz3OrGCjTPcW6eiOMheesVS 5hxietSmlin+SilmIAPZHx7n242u6kdHOh+/SyLImKn/dh9RzatVpUKbv34eP1wAGldWsRxb f3WP9pFNObSzI/Bo3kA89Xx2rO2roC+Gq4LeHvo7ptzcLcrqaHUAcZ3CgFG88CnA6z6lBZn0 WyewEcPOPdcUB2Q7D/NiUY+HDiV99rAYPJztjeTrBSTnHeSBPb+qn5ZZGQwIdUW9YegxWKvX XHTwB5eMzo/RB6vffwqcnHDoe0q7VgzRRZJwpi6aMIXLfeWZ5Wrwaw2zldFuO4Dt91pFzBSO IpeMtfgb/Pfe/a1WJ/GgaIRIBE+NUqckM+3zJHGmVPqJP/h2Iwv6nw8U+7Yyl6gUBLHFTg2h YnLFJI4Xjg+AX1hHFVKmvl3VBHIsBv0oDcsQWXqY+NaFahT0lRPjYtrTa1v3tem/JoFzZ4B0 p27K+qQCF2R96hVvuEyjzBmdq2esyE6zIqftdo4MOJho8uctOiWbwNNq2U9pPWmu4vXVFBYI GmpyNPYzRm0QPwARAQABwsF2BBgBCgAgAhsMFiEEm9B+DgxR+NWWd7dUG5NDfTtBYpsFAmna YUkACgkQG5NDfTtBYptX+BAApg32CkxwNucNEi8WfWA8oKkW0y8YDuY6ORMo9FWNGiT/OTy0 vyJrLocrpn86zwfjVp+eCrssPYh8eqJfnWqmYv6ACQtHPYzPZQ3mSo8H97Z01oUxITzCxpXm ZkLgPIqtDPcC2E3dPM/fVxcyowM8XsaMA9wcsaUYrta8toOq2b9tKcjleKMfMrm0gQ9u7wUc QbLkwj6TCLOwucb07GXzLTNF9PZmaDUpKAZjMjmrW+le+SFvQbhamx0rxLWPR0NWntXpbCn+ +ACch03p/JyTBVktxFsFyCt7pTPE1kEaeuXBTe/a2D9iQvRxRW19LvuO2e59/u1wYUiH/orz wbIC2S4dBsPAPihL3ztOU1yE86GPyQtSE0kU+/7snnLt4QGi6PChf3t5gnNjAzjUUovO8rgI c+5yN5heq5loYHgK6OQ9OlHzsPHO9e9MOQcKlFycs1pyijFGzDwdNUm/SchK8iWT2QApTx4A K9bCVaboTA2T77QYkRcRJYSsO1alGX0ome/hMLD1daXlkrNUp1HWa3K4iytLRXjCSIorWiGs n+q3krnpXu3TFkA8qtOFZMdnIiFuiq1yLT8hptsV5xh1TA2nsVvSYiaCr3q4s4BKjS/KrLDb qoxzw8ISjdUp4pA85vb6YLCmb39NgidD+7PmAr65lBNveIFynTgsja1rRQ4= In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 21/10/2026 14:00, Nabige Aala wrote: > > On 10/21/2026 5:23 PM, Krzysztof Kozlowski wrote: >> 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. > > Yes, only registers are changed. > > Okay, I'll update the SA8775P descriptor table to also support Nord and > drop the "qcom,nord-dp" compatible string change. Well, I am not insisting - see my last question - this just has to be addressed. Best regards, Krzysztof