Re: [PATCH v2 2/2] drm/bridge: waveshare-dsi: Add support for 1..4 DSI data lanes

[Luca Ceresoli]

On Thu Jan 15, 2026 at 3:39 AM CET, Marek Vasut wrote:
> Parse the data lane count out of DT. Limit the supported data lanes
> to 1..4 which is the maximum available DSI pairs on the connector of
> any known panels which may use this bridge. Internally, this bridge
> is an ChipOne ICN6211 which loads its register configuration from a
> dedicated storage and its I2C does not seem to be accessible. The
> ICN6211 also supports up to 4 DSI lanes, so this is a hard limit.
>
> To avoid any breakage on old DTs where the parsing of data lanes from
> DT may fail, fall back to the original hard-coded value of 2 lanes and
> warn user.
>
> The lane configuration is preconfigured in the bridge for each of the
> WaveShare panels. The 13.3" DSI panel works with 4-lane configuration,
> others seem to use 2-lane configuration. This is a hardware property,
> so the actual count should come from DT.
>
> Reviewed-by: Joseph Guo <qijian.guo@xxxxxxx>
> Signed-off-by: Marek Vasut <marek.vasut+renesas@xxxxxxxxxxx>

Reviewed-by: Luca Ceresoli <luca.ceresoli@xxxxxxxxxxx>

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com