linux-kernel - Re: [PATCH RFC 0/4] input: touchscreen: add initial support for Goodix Berlin touchscreen IC

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Date:   Tue, 6 Jun 2023 17:31:38 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bastien Nocera <hadess@...ess.net>,
        Henrik Rydberg <rydberg@...math.org>
Cc:     linux-input@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 0/4] input: touchscreen: add initial support for
 Goodix Berlin touchscreen IC

Hi Neil,

On 6/6/23 16:31, Neil Armstrong wrote:
> These touchscreen ICs support SPI, I2C and I3C interface, up to
> 10 finger touch, stylus and gestures events.
> 
> This initial driver is derived from the Goodix goodix_ts_berlin
> available at [1] and [2] and only supports the GT9916 IC
> present on the Qualcomm SM8550 MTP & QRD touch panel.
> 
> The current implementation only supports BerlinD, aka GT9916.
> 
> Support for advanced features like:
> - Firmware & config update
> - Stylus events
> - Gestures events
> - Previous revisions support (BerlinA or BerlinB)
> is not included in current version.
> 
> The current support will work with currently flashed firmware
> and config, and bail out if firmware or config aren't flashed yet.

What I'm missing here / in the commit msg of
"input: touchscreen: add core support for Goodix Berlin Touchscreen IC"

is an explanation why this is a new driver instead of adding
support to the existing goodix.c code.

I assume you have good reasons for this, but it would be good
if you can write the reasons for this down.

Regards,

Hans



> 
> [1] https://github.com/goodix/goodix_ts_berlin
> [2] https://git.codelinaro.org/clo/la/platform/vendor/opensource/touch-drivers
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
> Neil Armstrong (4):
>       dt-bindings: input: document Goodix Berlin Touchscreen IC
>       input: touchscreen: add core support for Goodix Berlin Touchscreen IC
>       input: touchscreen: add I2C support for Goodix Berlin Touchscreen IC
>       input: touchscreen: add SPI support for Goodix Berlin Touchscreen IC
> 
>  .../bindings/input/touchscreen/goodix-berlin.yaml  |  81 ++
>  drivers/input/touchscreen/Kconfig                  |  33 +
>  drivers/input/touchscreen/Makefile                 |   3 +
>  drivers/input/touchscreen/goodix_berlin.h          | 228 +++++
>  drivers/input/touchscreen/goodix_berlin_core.c     | 935 +++++++++++++++++++++
>  drivers/input/touchscreen/goodix_berlin_i2c.c      |  76 ++
>  drivers/input/touchscreen/goodix_berlin_spi.c      | 183 ++++
>  7 files changed, 1539 insertions(+)
> ---
> base-commit: 6db29e14f4fb7bce9eb5290288e71b05c2b0d118
> change-id: 20230606-topic-goodix-berlin-upstream-initial-ba97e8ec8f4c
> 
> Best regards,