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Fri, 23 Oct 2026 01:10:37 -0700 (PDT) Received: from [10.204.79.28] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3adcb0a11fbsm2517749a91.4.2026.10.23.01.10.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 23 Oct 2026 01:10:36 -0700 (PDT) From: Jayant Shekhar X-Google-Original-From: Jayant Shekhar Message-ID: Date: Fri, 23 Oct 2026 13:40:25 +0530 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 01/13] dt-bindings: display: msm: Add Qualcomm DCP bindings To: Krzysztof Kozlowski , Jayant Shekhar Cc: Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , Philipp Stanner , Bjorn Andersson , Konrad Dybcio , Abel Vesa , "Joerg Roedel (AMD)" , Will Deacon , Robin Murphy , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, iommu@lists.linux.dev References: <20261015-jshekhar-drm-msm-dcp-v1-v1-0-48aad0fe4f72@oss.qualcomm.com> <20261015-jshekhar-drm-msm-dcp-v1-v1-1-48aad0fe4f72@oss.qualcomm.com> <20261015-heavy-clam-of-sunshine-8fe831@quoll> Content-Language: en-US In-Reply-To: <20261015-heavy-clam-of-sunshine-8fe831@quoll> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIzMDAzMiBTYWx0ZWRfX7+M/gAseDQvr b+YPglQAABPRfg4kb5+8aG8eHECTG091jWnnxewhu3J7iR/VNT7EzM/QcxwxFjTmTbnmitqibO2 7MS7LYnsW7twF7zB0agqwZLeQLaiuSHO70hMpnlCtxV+LfOaESMD8rJ7Te1vd1ObHK6UGVXDTcm 6VBAtRJmRgedFRRQKHrEyl8+Xu9MsKgkbs25hdolE7bHoA/Wm+pDijvRwXiZvJKfuED5GSRCeZ0 +0o0pyDBbkxFAXwTZBPB7XFWHA0+VlZ+VA74PMPcw0yhisf5xvjYFD0MztByRSJDayrG1T0kv1M djHcGqW4MyRx52cg2gUVk7Q/GmrwznFAQE8LQUSqZ9aTdp4D5eyIaTFGJPS7LoAOGFu94vYYRpT 2mus66jeyFkbTnr+srLReVfodWiaq3+Whey2cGtid2PisG3hmFVhv1euPrVn8T0C9fy2ebR5kLP yb6+CCY4UXkGYD56uvQ== X-Proofpoint-ORIG-GUID: 2tYV2yS08lqcNPC7OKtzY3IzZxunRc2U X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIzMDAzMiBTYWx0ZWRfXwhi/u/NQJGvn S5vjV6ywqHv/6FfiAUq09K3v3uyn9eDcMW3uM9JQAgRr6pK5msds462QenDJTwQa4gt7t22VeHV p1gzslycGrBCXU6mSJxucBPUV06q7Fw= X-Proofpoint-GUID: 2tYV2yS08lqcNPC7OKtzY3IzZxunRc2U X-Authority-Analysis: v=2.4 cv=GLKdgeNK c=1 sm=1 tr=0 ts=6adb167e cx=c_pps a=UNFcQwm+pnOIJct1K4W+Mw==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=P-IC7800AAAA:8 a=gEfo2CItAAAA:8 a=EUspDBNiAAAA:8 a=CvYCOFMdU_owP9l6gQwA:9 a=QEXdDO2ut3YA:10 a=uKXjsCUrEbL0IQVhDsJ9:22 a=d3PnA9EDa4IxuAV0gXij:22 a=sptkURWiP4Gy88Gu7hUp:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-23_02,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 impostorscore=0 bulkscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 suspectscore=0 malwarescore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610230032 On 15-10-2026 16:20, Krzysztof Kozlowski wrote: > On Thu, Oct 15, 2026 at 01:08:21PM +0530, Jayant Shekhar wrote: >> DCP platforms place the display pipeline under firmware control, so Linux >> cannot discover display resources through direct register access. The DRM >> driver therefore needs device-tree descriptions of the firmware transport, >> display topology, IOMMU contexts, and panel connections. > Due to dependencies this cannot be tested, so limited review. > > A nit, subject: drop second/last, redundant "bindings". The > "dt-bindings" prefix is already stating that these are bindings. > See also: > https://elixir.bootlin.com/linux/v7.1-rc7/source/Documentation/devicetree/bindings/submitting-patches.rst#L23 > Thanks, will fix this in v2. >> Add bindings for the Qualcomm DCP VirtIO display function, including the >> INTF graph and DSI host outputs. Document the framebuffer IOMMU context, >> IPCC power-notify mailbox and interrupts, firmware display topology, and >> firmware-visible IOVA window supplied by the parent VirtIO-MMIO transport. >> >> Signed-off-by: Jayant Shekhar >> Assisted-by: LLM >> --- >> .../bindings/display/msm/qcom,dcp-dsi.yaml | 75 +++++++++++++ >> .../bindings/display/msm/qcom,dcp-virtio.yaml | 113 +++++++++++++++++++ >> .../devicetree/bindings/display/msm/qcom,dcp.yaml | 119 +++++++++++++++++++++ >> 3 files changed, 307 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/display/msm/qcom,dcp-dsi.yaml b/Documentation/devicetree/bindings/display/msm/qcom,dcp-dsi.yaml >> new file mode 100644 >> index 000000000000..f7178c66c09e >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/display/msm/qcom,dcp-dsi.yaml >> @@ -0,0 +1,75 @@ >> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause >> +%YAML 1.2 >> +--- >> +$id: http://devicetree.org/schemas/display/msm/qcom,dcp-dsi.yaml# >> +$schema: http://devicetree.org/meta-schemas/core.yaml# >> + >> +title: Qualcomm DCP DSI host >> + >> +maintainers: >> + - Jayant Shekhar >> + >> +description: | >> + A MIPI DSI host exposed by the Qualcomm DCP VirtIO device (see >> + qcom,dcp.yaml). DCP is a firmware protocol shared across multiple >> + Qualcomm SoCs, not specific to any one of them; Hawi is its first >> + platform. The DSI host and its connection to a panel are described >> + using the standard DSI controller and OF graph properties. >> + >> +allOf: >> + - $ref: /schemas/display/dsi-controller.yaml# >> + >> +properties: >> + reg: >> + maxItems: 1 >> + description: Index of this DSI host among its siblings. >> + >> + status: true > I see slop, I finished here. Mind this maintainers summit words - if you > use AI, you must use good one, not the shloppy slop. Will remove this in v2. Thanks Jayant > Best regards, > Krzysztof