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Date:   Wed, 6 Dec 2017 16:04:10 +0100
From:   Geert Uytterhoeven <>
To:     Lars Poeschel <>
Cc:     David Airlie <>, Rob Herring <>,
        Mark Rutland <>,
        Bartlomiej Zolnierkiewicz <>,
        Manuel Schölling <>,
        Greg Kroah-Hartman <>,
        Daniel Vetter <>,
        Stafford Horne <>,
        Christophe Leroy <>,
        Randy Dunlap <>,
        Kate Stewart <>,
        Philippe Ombredanne <>,
        Sean Paul <>,
        Thomas Gleixner <>,
        DRI Development <>,
        "" <>,
        "" <>,
        Linux Fbdev development list <>
Subject: Re: [PATCH] video: hd44780: Add hd44780 lcd display driver

Hi Lars,

On Wed, Dec 6, 2017 at 2:52 PM, Lars Poeschel <> wrote:
> This adds a console driver for hd44780 based character lcd displays and
> clones. The driver currently supports 20x4 character displays with
> character ROMs A00 and A02.
> The hardware wirings to the display have to be supplied to the kernel in
> the devicetree. The binding doc has the necessary information.
> There are also tons of these cheap displays sold with a serial
> interface. Many of them use a simple pcf8574 gpio expanders. An example
> for using that kind of display is also in the binding doc.
> Signed-off-by: Lars Poeschel <>

Thanks for your patch!

> ---
>  .../bindings/video/console/hd44780con.txt          |  42 ++
>  drivers/video/console/Kconfig                      |  13 +
>  drivers/video/console/Makefile                     |   1 +
>  drivers/video/console/hd44780con.c                 | 676 +++++++++++++++++++++

I'm wondering if you could implement this on top of the existing charlcd


which can use the existing hd44780 backend:


That way it can be used on other character LCDs, like the one supported by


P.S. I did something similar a long time ago, cfr.



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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