linux-kernel - Re: [PATCH v5 0/2] Support for Synaptics TDDI series panels

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Message-ID: <38e3a32db8402c1cbf3dc2fdf9f04ac3@disroot.org>
Date: Wed, 10 Sep 2025 16:25:40 +0000
From: Kaustabh Chakraborty <kauschluss@...root.org>
To: Neil Armstrong <neil.armstrong@...aro.org>, Jessica Zhang
 <quic_jesszhan@...cinc.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>, Jessica Zhang
 <jessica.zhang@....qualcomm.com>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Krzysztof Kozlowski
 <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v5 0/2] Support for Synaptics TDDI series panels

Hi,

Bumping to collect some reviews on this series. Thanks!

On 2025-08-20 14:24, Kaustabh Chakraborty wrote:
> Synaptics' Touch and Display Driver Integration (TDDI) technology [1]
> employs a single chip for both touchscreen and display capabilities.
> Such designs reportedly help reducing costs and power consumption.
> 
> Although the touchscreens, which are powered by Synaptics'
> Register-Mapped Interface 4 (RMI4) touch protocol via I2C or SPI have
> driver support in the kernel, the MIPI DSI display panels don't.
> 
> This series introduces a rudimentary driver for controlling said 
> display
> panels, which supports TD4101 and TD4300 panels.
> 
> [1] https://www.synaptics.com/technology/display-integration
> 
> Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
> ---
> Changes in v5:
> - added missing Reviewed-by tag from Krzysztof in [v3 1/2]
> - Link to v4: 
> https://lore.kernel.org/r/20250819-panel-synaptics-tddi-v4-0-448f466d16a6@disroot.org
> 
> Changes in v4:
> - utilized drm_connector_helper_get_modes_fixed() (dmitry.baryshkov)
> - constified backlight properties (dmitry.baryshkov)
> - Link to v3: 
> https://lore.kernel.org/r/20250720-panel-synaptics-tddi-v3-0-43a5957f4b24@disroot.org
> 
> Changes in v3:
> - fixed various dt_binding_check errors (robh's bot)
> - adjusted commit description of [v2 1/2] (robh)
> - utilized devm_drm_panel_alloc() and devm_regulator_bulk_get_const()
> - Link to v2: 
> https://lore.kernel.org/r/20250625-panel-synaptics-tddi-v2-0-7a62ab1d13c7@disroot.org
> 
> Changes in v2:
> - fixed various dt_binding_check errors (conor)
> - did s/tddi_update_brightness/tddi_update_status
> - added check for panel enable in tddi_update_status()
> - used backlight_get_brightness() in appropriate places
> - Link to v1: 
> https://lore.kernel.org/r/20250612-panel-synaptics-tddi-v1-0-dfb8a425f76c@disroot.org
> 
> ---
> Kaustabh Chakraborty (2):
>       dt-bindings: display: panel: document Synaptics TDDI panel
>       drm: panel: add support for Synaptics TDDI series DSI panels
> 
>  .../display/panel/synaptics,td4300-panel.yaml      |  89 +++++++
>  drivers/gpu/drm/panel/Kconfig                      |  11 +
>  drivers/gpu/drm/panel/Makefile                     |   1 +
>  drivers/gpu/drm/panel/panel-synaptics-tddi.c       | 276 
> +++++++++++++++++++++
>  4 files changed, 377 insertions(+)
> ---
> base-commit: 5303936d609e09665deda94eaedf26a0e5c3a087
> change-id: 20250523-panel-synaptics-tddi-0b0b3f07f814
> 
> Best regards,
> --
> Kaustabh Chakraborty <kauschluss@...root.org>