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([2a01:e0a:106d:1080:192b:8d21:b456:cb51]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4904174a145sm14887925e9.0.2026.05.21.23.32.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 21 May 2026 23:32:28 -0700 (PDT) Message-ID: Date: Fri, 22 May 2026 08:32:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Subject: Re: [PATCH v4 4/5] dt-bindings: display: Add Synaptics R63455 panel support To: Dmitry Baryshkov , Jun Nie Cc: 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: <20260521-sm8650-7-1-bonded-dsi-v4-0-a4dd5e0850f1@linaro.org> <20260521-sm8650-7-1-bonded-dsi-v4-4-a4dd5e0850f1@linaro.org> <2w6cpuzwxht2dv7a3xj57ukuzqa2b77ba2syl2ewdmq5bprczb@g3rm2k7e4l4h> 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: <2w6cpuzwxht2dv7a3xj57ukuzqa2b77ba2syl2ewdmq5bprczb@g3rm2k7e4l4h> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Neil Armstrong Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On 5/21/26 22:24, Dmitry Baryshkov wrote: > On Thu, May 21, 2026 at 10:46:06PM +0800, Jun Nie wrote: >> Add support for the dual-panel system found in the virtual reality device. >> This system consists of two physical 2160x2160 panels, each connected via >> a MIPI DSI interface. The backlight is managed through DSI link. >> >> Signed-off-by: Jun Nie >> --- >> .../bindings/display/panel/synaptics,r63455.yaml | 125 +++++++++++++++++++++ >> 1 file changed, 125 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/display/panel/synaptics,r63455.yaml b/Documentation/devicetree/bindings/display/panel/synaptics,r63455.yaml >> new file mode 100644 >> index 0000000000000..a94b355ed9557 >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/display/panel/synaptics,r63455.yaml >> @@ -0,0 +1,125 @@ >> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) >> +%YAML 1.2 >> +--- >> +$id: http://devicetree.org/schemas/display/panel/synaptics,r63455.yaml# >> +$schema: http://devicetree.org/meta-schemas/core.yaml# >> + >> +title: Synaptics R63455 based dual 2160x2160 MIPI-DSI Panel >> + >> +maintainers: >> + - Jun Nie >> + >> +description: >> + Synaptics R63455 is a Virtual Reality Display Driver and VR Bridge, used in >> + pair in Headset devices. The Virtual Reality Display complex is composed of >> + two strictly identical display panels, each driven by its own DSI interface >> + but forms a single virtual display for the human eye perception and thus >> + requires a strict synchronization of the two display panel content update. >> + >> +allOf: >> + - $ref: panel-common.yaml# >> + >> +properties: >> + compatible: >> + items: >> + - enum: >> + - sharp,ls026b3sa06 >> + - boe,vs026c4m-n52-6000 >> + - const: synaptics,r63455 >> + >> + reset-gpios: >> + maxItems: 2 >> + description: 2 reset pins for 2 physical panels >> + >> + left-pos-supply: >> + description: Positive 5.7V supply for left panel > > So, is the R63455 driving both panels or are there two panels, each > having R63455 controller? What if somebody gets a single Sharp panel and > wants to use it in their device? How will it match these bindings? It's highly improbable, those are very specialized panels that are designed for xr usage in pair. Yes a hobbyist could try to use a single panel but it's only usable when placed close to an eye, and barely useless if you don't have both eyes. Let's skip highly improbable use-cases and focus on the main use case of the hardware device. > >> + >> + right-pos-supply: >> + description: Positive 5.7V supply for right panel >> + >> + left-neg-supply: >> + description: Negative 5.7V supply for left panel >> + >> + right-neg-supply: >> + description: Negative 5.7V supply for right panel >> + >> + left-backlight-supply: >> + description: Backlight 21V supply for left panel >> + >> + right-backlight-supply: >> + description: Backlight 21V supply for right panel >> + >> + vdda-supply: >> + description: core 1.8V supply for panels >> + >> + ports: $ref: /schemas/graph.yaml#/properties/ports >> + >> +required: >> + - compatible >> + - reset-gpios >> + - left-pos-supply >> + - left-neg-supply >> + - right-pos-supply >> + - right-neg-supply >> + - left-backlight-supply >> + - right-backlight-supply >> + - vdda-supply >> + >> +additionalProperties: false >> + >> +examples: >> + - | >> + #include >> + >> + &mdss_dsi0 { > > Please drop the MDSS specifics, there should be one (or two) DSI busses, > driving your panels. The rests are details which are not necessary for > the example. > >> + vdda-supply = <&vreg_l3i_1p2>; >> + status = "okay"; >> + >> + qcom,dual-dsi-mode; >> + qcom,master-dsi; >> + >> + panel: panel@0 { >> + compatible = "sharp,ls026b3sa06", "synaptics,r63455"; >> + reg = <0>; >> + >> + reset-gpios = <&pm8550_gpios 3 GPIO_ACTIVE_HIGH>, >> + <&pm8550_gpios 11 GPIO_ACTIVE_HIGH>; >> + >> + left-pos-supply = <&vpos_left>; >> + left-neg-supply = <&vneg_left>; >> + right-pos-supply = <&vpos_right>; >> + right-neg-supply = <&vneg_right>; >> + left-backlight-supply = <&backlight_left>; >> + right-backlight-supply = <&backlight_right>; >> + >> + vdda-supply = <&vreg_l12b_1p8>; >> + >> + ports { >> + #address-cells = <1>; >> + #size-cells = <0>; >> + port@0 { >> + reg = <0>; >> + panel0_in: endpoint { >> + remote-endpoint = <&mdss_dsi0_out>; > > What is mdss_dsi0_out? > >> + }; >> + }; >> + >> + port@1 { >> + reg = <1>; >> + panel1_in: endpoint { >> + remote-endpoint = <&mdss_dsi1_out>; >> + }; >> + }; >> + }; >> + }; >> + >> + &mdss_dsi0_out { >> + remote-endpoint = <&panel0_in>; >> + data-lanes = <0 1 2>; >> + }; >> + >> + &mdss_dsi1_out { >> + remote-endpoint = <&panel1_in>; >> + data-lanes = <0 1 2>; >> + }; >> +... >> >> -- >> 2.43.0 >> >