linux-kernel - Re: [PATCH v2 0/7] Add anx6345 DP/eDP bridge for Olimex Teres-I

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Date:   Mon, 22 Jul 2019 11:47:33 -0700
From:   Vasily Khoruzhick <anarsoul@...il.com>
To:     Torsten Duwe <duwe@....de>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Icenowy Zheng <icenowy@...c.io>,
        Sean Paul <seanpaul@...omium.org>,
        Harald Geyer <harald@...ib.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree <devicetree@...r.kernel.org>,
        arm-linux <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>, <"Bcc:duwe"@lst.de>
Subject: Re: [PATCH v2 0/7] Add anx6345 DP/eDP bridge for Olimex Teres-I

On Mon, Jul 22, 2019 at 8:04 AM Torsten Duwe <duwe@....de> wrote:
>
> ANX6345 LVTTL->eDP video bridge, driver with device tree bindings.
>
> Changes from v2:
>
> * use SPDX-IDs throughout
>
> * removed the panel output again, as it was not what Maxime had in mind.
>   At least the Teres-I does very well without. No connector spec, no "quirks"[1],
>   just plain EDID at work.

You still need a panel to put backlight in there. Otherwise backlight
will stay on when display is turned off.

>
> * binding clarifications and cosmetic changes as suggested by Andrzej
>
> Changes from v1:
>
> * fixed up copyright information. Most code changes are only moves and thus
>   retain copyright and module ownership. Even the new analogix-anx6345.c originates
>   from the old 1495-line analogix-anx78xx.c, with 306 insertions and 987 deletions
>   (ignoring the trivial anx78xx -> anx6345 replacements) 306 new vs. 508 old...
>
> * fixed all minor formatting issues brought up
>
> * merged previously separate new analogix_dp_i2c module into existing analogix_dp
>
> * split additional defines into a preparatory patch
>
> * renamed the factored-out common functions anx_aux_* -> anx_dp_aux_*, because
>   anx_...aux_transfer was exported globally. Besides, it is now GPL-only exported.
>
> * moved chip ID read into a separate function.
>
> * keep the chip powered after a successful probe.
>   (There's a good chance that this is the only display during boot!)
>
> * updated the binding document: LVTTL input is now required, only the output side
>   description is optional.
>
>  Laurent: I have also looked into the drm_panel_bridge infrastructure,
>  but it's not that trivial to convert these drivers to it.
>
> Changes from the respective previous versions:
>
> * the reset polarity is corrected in DT and the driver;
>   things should be clearer now.
>
> * as requested, add a panel (the known innolux,n116bge) and connect
>   the ports.
>
> * renamed dvdd?? to *-supply to match the established scheme
>
> * trivial update to the #include list, to make it compile in 5.2
>
> --------------
> [1] I hesitate to associate information about a connected panel with that term.
>     But should it be neccessary for maximum power saving (e.g. pinebooks),
>     it would be good to have something here, regardless of nomenclature.
>
>         Torsten