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[90.182.211.1]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48c622ab5a1sm2214789f8f.36.2026.10.05.01.56.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 05 Oct 2026 01:56:59 -0700 (PDT) Message-ID: <538604b5-56bf-45d2-9a73-050a0f2b14ce@linaro.org> Date: Mon, 5 Oct 2026 10:56:57 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Reply-To: Neil Armstrong Subject: Re: [PATCH v5 5/6] dt-bindings: display: Add Synaptics panel support To: Linus Walleij Cc: Dmitry Baryshkov , Krzysztof Kozlowski , Jun Nie , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20260727-sm8650-7-1-bonded-dsi-v5-0-c042266b9eeb@linaro.org> <20260727-sm8650-7-1-bonded-dsi-v5-5-c042266b9eeb@linaro.org> <20260727-spotted-winged-mantis-7aa1ce@quoll> <668e83d0-a017-4f59-bc76-bf6c9a80b5ba@kernel.org> <2lcpzwh7fxecpffnakpnp5lecrm3e6u64ztat7cd75nuxofxa2@clj27bzgjy3r> <4d053234-06d8-4268-b60a-2fccc78da654@linaro.org> <8cf6ec52-fb36-44e7-831c-2bb24214f591@linaro.org> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 10/4/26 22:22, Linus Walleij wrote: > Hi Neil, > > On Sun, Oct 4, 2026 at 5:51 PM Neil Armstrong wrote: > >> Describing it in separate distincts nodes is wrong since it doesn't reflect >> that it's an unified display, so either we define : >> - a "combined-display" bridge defined as: >> - a separate top node in / like connectors with a graph from the DSI links to each panel >> - a DSI subnode with 2 panels as subnode, port graph from both dsi to both sub-panels >> - a "R63455" panel bindings with 2 subpanels as Linus shared in https://lore.kernel.org/all/CAD++jLkyEPY5cFg_pHb71yG52iLwS9tQDpcHu=TTBknQMeFctw@mail.gmail.com/ >> >> I think it would be interesting to have the "combined-display", with a connector-like node, >> which will do all the split-dsi dual-panel logic for us and leave use implementing simple panel >> drivers. >> >> The outline would be: > > Overall I really like the looks of this! > >> xr-display { >> compatible = "combined-display"; >> >> ports { >> port@0 { >> combined_dsi0: endpoint { >> remote-endpoint = <&dsi0_out>; >> }; >> }; >> port@1 { >> combined_dsi1: endpoint { >> remote-endpoint = <&dsi1_out>; >> }; >> }; >> port@2 { >> combined_panel0: endpoint { >> remote-endpoint = <&r63455_right_in>; >> }; >> }; >> port@3 { >> combined_panel1: endpoint { >> remote-endpoint = <&r63455_left_in>; >> }; >> }; >> }; >> }; > > The core of the crux is to make the argument that this node represents > the hardware and isn't just something put in there to make it easier > to implement a driver. > > If I break open the headset, will I find something like this, some wires > going around in there or so. Well you'll find 2 lens modules with embedded panels, they are separate because they go for each eye, since it's technically a single display for the brain. You can't really use each panel separately, they are mounted in a specific way to be looked closely by human eyes. Neil > > If yes, this is a go. > > Yours, > Linus Walleij