Re: [PATCH v4 05/25] drm/tilcdc: Convert legacy panel binding via DT overlay at boot time

[Herve Codina <herve.codina@bootlin.com>]

Hi Kory,

On Fri, 16 Jan 2026 18:02:05 +0100
"Kory Maincent (TI.com)" <kory.maincent@bootlin.com> wrote:

> To maintain backward compatibility while removing the deprecated
> tilcdc_panel driver, add a tilcdc_panel_legacy subdriver that converts
> the legacy "ti,tilcdc,panel" devicetree binding to the standard
> panel-dpi binding at early boot.
> 
> The conversion uses an embedded device tree overlay that is applied and
> modified during subsys_initcall. The process:
> 
> - Apply embedded overlay to create a tilcdc-panel-dpi node with
>   port/endpoint connections to the LCDC
> - Copy all properties from the legacy panel node to the new
>   tilcdc-panel-dpi node
> - Copy display-timings from the legacy panel
> - Convert legacy panel-info properties (invert-pxl-clk, sync-edge) to
>   standard display timing properties (pixelclk-active, syncclk-active)
> - Disable the legacy panel by removing its compatible property to
>   prevent the deprecated driver from binding
> 
> The result is a standard tilcdc-panel-dpi node with proper endpoints and
> timing properties, allowing the DRM panel infrastructure to work with
> legacy devicetrees without modification.
> 
> Other legacy panel-info properties are not migrated as they consistently
> use default values across all mainline devicetrees and can be hardcoded
> in the tilcdc driver.
> 
> This feature is optional via CONFIG_DRM_TILCDC_PANEL_LEGACY and should
> only be enabled for systems with legacy devicetrees containing
> "ti,tilcdc,panel" nodes.
> 
> Suggested-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> Link: https://lore.kernel.org/all/1d9a9269-bfda-4d43-938b-2df6b82b9369@ideasonboard.com/
> Signed-off-by: Kory Maincent (TI.com) <kory.maincent@bootlin.com>
> ---

Looks good to me.

Reviewed-by: Herve Codina <herve.codina@bootlin.com>

Best regards,
Hervé