linux-kernel - Re: [PATCH V5 0/5] drm/bridge: it66121: Add initial it66122 support

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Message-ID: <20250915140351.cjegerbuvhezeapt@screen>
Date: Mon, 15 Sep 2025 09:03:51 -0500
From: Nishanth Menon <nm@...com>
To: Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Rob Herring <robh@...nel.org>, David Airlie
	<airlied@...il.com>,
        Maxime Ripard <mripard@...nel.org>,
        Laurent Pinchart
	<Laurent.pinchart@...asonboard.com>,
        Neil Armstrong
	<neil.armstrong@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        Robert Nelson <robertcnelson@...il.com>,
        Jason Kridner <jkridner@...gleboard.org>, <afd@...com>,
        <tomi.valkeinen@...asonboard.com>, <devarsht@...com>,
        <dmitry.baryshkov@....qualcomm.com>
Subject: Re: [PATCH V5 0/5] drm/bridge: it66121: Add initial it66122 support

On 15:23-20250827, Nishanth Menon wrote:
> Hi,
> 
> Add initial support for IT66122, which seems to be compatible to it66121
> but probably has additional functionality.
> 
> BeagleY-AI uses this it66122 as the old part is no longer in production
> as far as I understand.
> 
> Now, BeaglePlay uses it66121 at the moment, but at some point, it might
> end up flipping over to the new part. Additionally, it also looks like
> Revision D of BeagleBone Black switched over to it66122 as well.
> 
> Series is based on next-20250827
> 
> Bootlog: BeaglePlay: https://gist.github.com/nmenon/65afb917ee1818979d338cf25732a920
> 
> Changes in V5:
> * Switched over to ARRAY_SIZE
> * Picked up Andrew's Reviewed-by
> 
> Changes in V4:
> * Added patch to sort the compatibles alpha-numerically
> * vid/pid lookup is done without using the match_data.
> * picked reviews
> 
> Changes in V3:
> Based on Tomi's and Devarsh's reviews, and searching online (and failing
> to find) for a public data sheet, I have refactored the series to:
> a) Detect the ID by matching vid/pid
> b) Introduce it66122 basic support which seems to work based on
>    empirical testing evidence on BeagleY-AI. This allows incremental
>    patches in the future by someone who might have access to the data
>    sheet to add additional features for the chip.
> c) Irritated by checkpatch --strict warnings, added a patch to fix
>    existing warnings as part of this series, but it could probably go
>    in independent of everything else.
> d) Stopped claiming it66122 is drop in replacement of it66121 :)
> 
> Changes in V2:
> * Picked up Krystoff's binding ack
> * Switched over to a vid/pid list
> 
> V4: https://lore.kernel.org/all/20250819130807.3322536-1-nm@ti.com/
> V3: https://lore.kernel.org/all/20250815034105.1276548-1-nm@ti.com/
> V2: https://lore.kernel.org/all/20250813204106.580141-1-nm@ti.com/
> V1: https://lore.kernel.org/all/20250813190835.344563-1-nm@ti.com/
> 
> Nishanth Menon (5):
>   dt-bindings: display: bridge: it66121: Add compatible string for
>     IT66122
>   drm/bridge: it66121: Drop ftrace like dev_dbg() prints
>   drm/bridge: it66121: Sort the compatibles
>   drm/bridge: it66121: Use vid/pid to detect the type of chip
>   drm/bridge: it66121: Add minimal it66122 support
> 
>  .../bindings/display/bridge/ite,it66121.yaml  |  1 +
>  drivers/gpu/drm/bridge/ite-it66121.c          | 68 +++++++++----------
>  2 files changed, 34 insertions(+), 35 deletions(-)

Since it has been a while,

DRM maintainers: gentle ping. Hope we can roll this to drm-misc-next if
there are no further comments?

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D
https://ti.com/opensource