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Mon, 12 Oct 2026 11:55:56 -0700 (PDT) Received: from hu-mdsor-hyd.qualcomm.com ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3537ca1b556sm47798864eec.9.2026.10.12.11.55.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Oct 2026 11:55:55 -0700 (PDT) Date: Tue, 13 Oct 2026 00:25:49 +0530 From: Mohit Dsor To: Dmitry Baryshkov Cc: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, venkata.valluru@oss.qualcomm.com, Jessica Zhang Subject: Re: [PATCH v4 1/2] arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support Message-ID: References: <20261007-master_lt9611uxd-v4-0-9986704e2a7b@oss.qualcomm.com> <20261007-master_lt9611uxd-v4-1-9986704e2a7b@oss.qualcomm.com> <3gylobhugzzwngtxwzke2o6almcmjzxrjqefpkmcpjy74baxvh@akzm74tyb2n6> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3gylobhugzzwngtxwzke2o6almcmjzxrjqefpkmcpjy74baxvh@akzm74tyb2n6> X-Proofpoint-GUID: MkUJ8FGzRpl7gNTv7L1pLywnjlDspV4A X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEyMDA3NSBTYWx0ZWRfX/14ELmuT+lXX 3YGuO6jHJvJnbtNVtIafHxY8NPZfNcbJJ+19sulsqzTyaTN7Xa3lF4AECFC7/rgevLr/kQmtATD OiZY0PvRxVxjZLYfTXbqlMtkQG6yGcs= X-Proofpoint-ORIG-GUID: MkUJ8FGzRpl7gNTv7L1pLywnjlDspV4A X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEyMDA3NSBTYWx0ZWRfXzTcW+KXMQGcR BxktGKqMdijbwTvbWkZUbGxH7W3U14XPH5tH+yiW8IavOwxIej1xJg7HfkAvWCKtVzNqfX/mzAl sn1MTMtRRo7JxR/ASbMHLDxl0sT64tMA3rH7K/pYIgqtZ2cgQvOx/x/OzhkWyiirszbePdDcQ+k ye1jg8tZq9sPw8JjqAom04BK1pamDRRCby/3Jw2irNJfPPQQm6fpMLc2ZuPasNzzhbjKI0qYZ1+ KQLdb/PIGT1QDK5hoDGs5VvEOpNXHq+guute9sdAKDp0YM5Z9BD2BOsf99gtQ16G7nQklcL/aNY fsESBJoPZmS+X2GCWWF/bXC3vDq1xskYDfwTCyyfhNStg/ZSHt/+jImNyySM6l2sVeKLKGxxopI k/edTGyGJBdyhLGRdhRUDst51bWaJKbfOqs4foSYfUZvIjZOQ1xpiPb6IHYYoYwxZf33Kz9covS YMJv0I1R+dfHfw/pKJg== X-Authority-Analysis: v=2.4 cv=PbhqFShd c=1 sm=1 tr=0 ts=6acd2d3e cx=c_pps a=PfFC4Oe2JQzmKTvty2cRDw==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=kj9zAlcOel0A:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=EUspDBNiAAAA:8 a=PizxIPtMwCBzAtEjQcMA:9 a=CjuIK1q_8ugA:10 a=6Ab_bkdmUrQuMsNx7PHu:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-12_05,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 clxscore=1015 impostorscore=0 spamscore=0 phishscore=0 suspectscore=0 priorityscore=1501 malwarescore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610120075 On Wed, Oct 07, 2026 at 04:40:26PM +0300, Dmitry Baryshkov wrote: > On Wed, Oct 07, 2026 at 06:21:06PM +0530, Mohit Dsor wrote: > > Enable the Shikra MDSS display subsystem on the Qualcomm Shikra IQS > > EVK board and add the Lontium LT9611UXD DSI-to-HDMI bridge node. > > > > The LT9611UXD is connected via I2C (bus 4, address 0x41), powered by > > a GPIO-controlled 3.3V regulator (PM8150 GPIO4) and an always-on 1.8V > > rail. Reset is on GPIO76 and interrupt on GPIO85. > > > > The bridge receives DSI output from MDSS and drives an HDMI-A > > connector, with the link wired as: DPU -> DSI0 -> LT9611UXD -> HDMI. > > > > Regulator and pinctrl labels use generic board-level names > > (vreg_disp_3p3, bridge_irq_pin, bridge_rst_pin) to decouple them > > from the bridge chip. > > > > Signed-off-by: Mohit Dsor > > --- > > arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts | 109 ++++++++++++++++++++++++++++ > > 1 file changed, 109 insertions(+) > > > > + > > +&i2c4 { > > + status = "okay"; > > + > > + lt9611uxd: lt9611uxd@41 { > > unused label. rename the node to hdmi-bridge The label will be required in overlays on top of HDMI so shall we remove it now or add in overlay series ? > > > + compatible = "lontium,lt9611uxd"; > > + reg = <0x41>; > > + interrupts-extended = <&tlmm 85 IRQ_TYPE_EDGE_FALLING>; > > + reset-gpios = <&tlmm 76 GPIO_ACTIVE_LOW>; > > + vcc-supply = <&vreg_disp_3p3>; > > + vdd-supply = <&pm8150_s4>; > > + > > + pinctrl-0 = <&bridge_irq_pin &bridge_rst_pin>; > > + pinctrl-names = "default"; > > + > > + ports { > > + #address-cells = <1>; > > + #size-cells = <0>; > > + > > + port@0 { > > + reg = <0>; > > + > > + lt9611_a: endpoint { > > + remote-endpoint = <&mdss_dsi0_out>; > > + }; > > + }; > > + > > + port@2 { > > + reg = <2>; > > + > > + lt9611_out: endpoint { > > + remote-endpoint = <&hdmi_con>; > > hdmi_connector_out Will fix it in next version. > > > + }; > > + }; > > + }; > > + }; > > +}; > > + > > @@ -67,6 +160,22 @@ &sdhc_2 { > > status = "okay"; > > }; > > > > +&tlmm { > > + bridge_irq_pin: bridge-irq-state { > > + pins = "gpio85"; > > + function = "gpio"; > > + drive-strength = <2>; > > + bias-disable; > > + }; > > + > > + bridge_rst_pin: bridge-rst-state { > > I think the current recommendation is to sort them by the pin number. Sure, will sort it accordingly. > > > + pins = "gpio76"; > > + function = "gpio"; > > + drive-strength = <8>; > > + bias-disable; > > + }; > > +}; > > + > > &usb_1_hsphy { > > vdd-supply = <&pm8150_l4>; > > vdda-pll-supply = <&pm8150_l12>; > > > > -- > > 2.34.1 > > > > -- > With best wishes > Dmitry