linux-kernel - [PATCH v2 0/3] Add DSI Port B input support for LT9611 HDMI bridge

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Message-Id: <20260128-rubikpi-next-20260116-v2-0-ba51ce8d2bd2@thundersoft.com>
Date: Wed, 28 Jan 2026 19:15:44 +0800
From: Hongyang Zhao <hongyang.zhao@...ndersoft.com>
To: Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 Hongyang Zhao <hongyang.zhao@...ndersoft.com>, 
 Roger Shimizu <rosh@...ian.org>
Subject: [PATCH v2 0/3] Add DSI Port B input support for LT9611 HDMI bridge

The LT9611 HDMI bridge has two DSI input ports (Port A and Port B).
The current driver only supports Port A or dual-port (A+B) mode, but
some boards like RubikPi3 connect DSI to Port B only.

This series adds support for using DSI Port B as the input source by
utilizing the existing ports mechanism in devicetree:

- port@0 corresponds to LT9611 DSI Port A input
- port@1 corresponds to LT9611 DSI Port B input

The driver detects which ports are populated and configures the hardware
accordingly. When only port@1 is present, it configures port swap
(register 0x8303 bit 6) and byte_clk source (register 0x8250 bit 3:2)
for Port B operation.

Signed-off-by: Hongyang Zhao <hongyang.zhao@...ndersoft.com>
---
Changes in v2:
- Use ports mechanism instead of boolean property
- port@0 corresponds to LT9611 Port A, port@1 to Port B
- Driver detects which port is populated and configures accordingly
- Link to v1: https://lore.kernel.org/r/20260127-rubikpi-next-20260116-v1-0-0286c75150c5@thundersoft.com

---
Hongyang Zhao (3):
      dt-bindings: display: lt9611: Support single Port B input
      drm/bridge: lt9611: Add support for single Port B input
      arm64: dts: qcom: qcs6490-rubikpi3: Use lt9611 DSI Port B

 .../bindings/display/bridge/lontium,lt9611.yaml    | 15 +++++--
 .../boot/dts/qcom/qcs6490-thundercomm-rubikpi3.dts |  8 ++--
 drivers/gpu/drm/bridge/lontium-lt9611.c            | 46 +++++++++++++++-------
 3 files changed, 47 insertions(+), 22 deletions(-)
---
base-commit: 46fe65a2c28ecf5df1a7475aba1f08ccf4c0ac1b
change-id: 20260127-rubikpi-next-20260116-99c1dbea50e4

Best regards,
-- 
Hongyang Zhao <hongyang.zhao@...ndersoft.com>