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

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Date:   Mon, 12 Jun 2023 12:07:59 -0500
From:   Jeff LaBundy <jeff@...undy.com>
To:     Neil Armstrong <neil.armstrong@...aro.org>
Cc:     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>,
        Hans de Goede <hdegoede@...hat.com>,
        Henrik Rydberg <rydberg@...math.org>,
        linux-input@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 4/4] input: touchscreen: add SPI support for Goodix
 Berlin Touchscreen IC

Hi Neil,

[...]

> > > +static const struct input_id goodix_berlin_spi_input_id = {
> > > +	.bustype = BUS_SPI,
> > > +	.vendor = 0x0416,
> > > +	.product = 0x1001,
> > 
> > After having seen these in the I2C counterpart; consider defining them
> > in goodix_berlin.h.
> 
> To be honest, I blindly copied it from goodix.c because the vendor
> driver puts random values here.
> 
> input_dev->id.product = 0xDEAD;
> input_dev->id.vendor = 0xBEEF;
> 
> So what should I set ?

If there is no explicit guidance from the vendor, I would simply leave
these unassigned; in theory one would imagine that this controller would
have a different product ID than other models.

[...]

Kind regards,
Jeff LaBundy