linux-kernel - Re: [PATCH v1 0/2] Add waveshare 7inch touchscreen panel support

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Message-ID: <0447c983-ee90-475e-9356-ad451f32da1d@starfivetech.com>
Date:   Wed, 6 Dec 2023 17:53:23 +0800
From:   Shengyang Chen <shengyang.chen@...rfivetech.com>
To:     Stefan Wahren <wahrenst@....net>, <devicetree@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>
CC:     <neil.armstrong@...aro.org>, <quic_jesszhan@...cinc.com>,
        <sam@...nborg.org>, <airlied@...il.com>, <daniel@...ll.ch>,
        <maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <florian.fainelli@...adcom.com>,
        <bcm-kernel-feedback-list@...adcom.com>,
        <thierry.reding@...il.com>, <changhuang.liang@...rfivetech.com>,
        <keith.zhao@...rfivetech.com>, <jack.zhu@...rfivetech.com>,
        <linux-rpi-kernel@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 0/2] Add waveshare 7inch touchscreen panel support

Hi, Stefan

Thanks for your comment and review

On 2023/11/24 22:54, Stefan Wahren wrote:
> Hi Shengyang,
> 
> [fix address of Emma]
> 
> Am 24.11.23 um 11:44 schrieb Shengyang Chen:
>> This patchset adds waveshare 7inch touchscreen panel support
>> for the StarFive JH7110 SoC.
>>
>> Patch 1 add new compatible for the raspberrypi panel driver and its dt-binding.
>> Patch 2 add new display mode and new probing process for raspberrypi panel driver.
>>
>> Waveshare 7inch touchscreen panel is a kind of raspberrypi panel
>> which can be drived by raspberrypi panel driver.
>>
>> The series has been tested on the VisionFive 2 board.
> surprisingly i was recently working on the official Raspberry Pi
> touchscreen and was able to get it running the new way.
> 
> What do i mean with the new way. There is almost nothing special to the
> Raspberry Pi touchscreen, so we should try to use/extend existing
> components like:
> 
> CONFIG_DRM_PANEL_SIMPLE
> CONFIG_TOUCHSCREEN_EDT_FT5X06
> CONFIG_DRM_TOSHIBA_TC358762
> 
> The only special part is the Attiny on the connector PCB which requires:
> 
> CONFIG_REGULATOR_RASPBERRYPI_TOUCHSCREEN_ATTINY
> 
> So the whole point is to avoid writing monolitic drivers for simple
> panel like that.
> 
> There is a WIP branch based on top of Linux 6.7-rcX, which should
> demonstrate this approach [1]. Unfortunately it is not ready for
> upstreaming, but it has been tested on a Raspberry Pi 3 B Plus. Maybe
> this is helpful for your case.
> 
> Actually i consider panel-raspberrypi-touchscreen.c as a dead end, which
> shouldn't be extended.
> 
> Btw there are already DT overlays in mainline which seems to use the
> Raspberry Pi 7inch panel (without touch function yet) [2].
> 
> [1] - https://github.com/lategoodbye/rpi-zero/commits/v6.7-7inch-ts
> [2] -
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/arch/arm64/boot/dts/freescale/imx8mm-venice-gw72xx-0x-rpidsi.dtso?h=v6.6.2&id=6b4da1354fd81adace0cda448c77d8f2a47d8474
> 

Thank you very much for your advice. We will try this method before making new patch.
This method will be used if its verified in our soc.
If there is any problem, we may continue to contact. Thanks a lot.

>>
>> Shengyang Chen (2):
>>    dt-bindings: display: panel: raspberrypi: Add compatible property for
>>      waveshare 7inch touchscreen panel
>>    gpu: drm: panel: raspberrypi: add new display mode and new probing
>>      process
>>
>>   .../panel/raspberrypi,7inch-touchscreen.yaml  |  4 +-
>>   .../drm/panel/panel-raspberrypi-touchscreen.c | 99 ++++++++++++++++---
>>   2 files changed, 91 insertions(+), 12 deletions(-)
>>
> 


thanks

Best Regards,
Shengyang