linux-kernel - Re: [PATCH v2] arm64: dts: imx8mp: add imx8mp-venice-gw74xx-rpidsi overlay for display

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Date:   Wed, 25 Oct 2023 09:06:21 -0700
From:   Tim Harvey <tharvey@...eworks.com>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     kernel@...gutronix.de, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] arm64: dts: imx8mp: add imx8mp-venice-gw74xx-rpidsi
 overlay for display

On Wed, Oct 25, 2023 at 8:25 AM Marc Kleine-Budde <mkl@...gutronix.de> wrote:
>
> On 25.10.2023 16:33:07, Marc Kleine-Budde wrote:
> > Hey Tim,
> >
> > On 19.07.2023 08:29:20, Tim Harvey wrote:
> > > Add support for the following Raspberry Pi displays:
> > >  - DFROBOT DRF0678 7in 800x480 TFT DSI capacitive touch
> > >  - DFROBOT DRF0550 5in 800x480 TFT DSI capacitive touch
> > >
> > > Both have the following hardware:
> > >  - FocalTech FT5406 10pt touch controller (with no interrupt)
> > >  - Powertip PH800480T013-IDF02 compatible panel
> > >  - Toshiba TC358762 compatible DSI to DBI bridge
> > >  - ATTINY based regulator used for backlight controller and panel enable
> > >
> > > Support is added via a device-tree overlay. The touch controller is not
> > > yet supported as polling mode is needed.
> >
> > I'm just integrating the 7in Raspberry Pi display for a customer on an
> > imx8mp. Do you have a (non-mainline) touch driver that works for the
> > Raspberry Pi display? I might fight some time in this project to work on
> > it.
>
> Replying to myself:
>
> Have a look at drivers/input/touchscreen/edt-ft5x06.c
>

Hi Marc,

The specific display I have is the one from DFROBOT which emulates the
original Rpi display as far as I know.

I came up with two different approaches, neither of which I got any
comments from. I haven't spent any additional time on it and have just
been carrying around a custom patch to support it.

You can find my patches here:
https://patchwork.kernel.org/project/linux-input/list/?series=596977&state=%2A&archive=both
- add support for DFROBOT touch controller
https://www.spinics.net/lists/linux-input/msg76457.html - proposal of
adding a new driver

There's possibly a newer version of the patch that adds a new driver
on a 6.1 kernel here:
https://github.com/Gateworks/linux-venice/commit/5bf0ffcf0352b45c29d33184e933a35dd53f27bb

Is this the same touch controller you are working with?

Best Regards,

Tim