linux-kernel - Re: [PATCH v4 0/2] Support for Synaptics TDDI series panels

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Message-ID: <20250819224542.GA1591380-robh@kernel.org>
Date: Tue, 19 Aug 2025 17:45:42 -0500
From: Rob Herring <robh@...nel.org>
To: Kaustabh Chakraborty <kauschluss@...root.org>
Cc: 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>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Jessica Zhang <jessica.zhang@....qualcomm.com>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/2] Support for Synaptics TDDI series panels

On Tue, Aug 19, 2025 at 08:26:43PM +0530, 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 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

Where's Krzysztof's Reviewed-by?

> 
> 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: 3ac864c2d9bb8608ee236e89bf561811613abfce
> change-id: 20250523-panel-synaptics-tddi-0b0b3f07f814
> 
> Best regards,
> -- 
> Kaustabh Chakraborty <kauschluss@...root.org>
>