linux-kernel - Re: [PATCH 2/4] Documentation: DT: bindings: input: Add documentation for cyttsp5

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Date:   Wed, 27 Oct 2021 22:28:14 +1000
From:   Alistair Francis <alistair23@...il.com>
To:     Andreas Kemnade <andreas@...nade.info>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alistair Francis <alistair@...stair23.me>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux Input <linux-input@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Henrik Rydberg <rydberg@...math.org>,
        Mylene Josserand <mylene.josserand@...e-electrons.com>
Subject: Re: [PATCH 2/4] Documentation: DT: bindings: input: Add documentation
 for cyttsp5

On Tue, Oct 26, 2021 at 5:16 PM Andreas Kemnade <andreas@...nade.info> wrote:
>
> On Tue, 26 Oct 2021 01:18:24 +0200
> Linus Walleij <linus.walleij@...aro.org> wrote:
>
> > Hi Alistair,
> >
> > On Mon, Oct 25, 2021 at 1:42 PM Alistair Francis <alistair@...stair23.me> wrote:
> >
> > > From: Mylène Josserand <mylene.josserand@...e-electrons.com>
> > >
> > > Add the Cypress TrueTouch Generation 5 touchscreen device tree bindings
> > > documentation. It can use I2C or SPI bus.
> > > This touchscreen can handle some defined zone that are designed and
> > > sent as button. To be able to customize the keycode sent, the
> > > "linux,code" property in a "button" sub-node can be used.
> > >
> > > Signed-off-by: Mylène Josserand <mylene.josserand@...e-electrons.com>
> > > Message-Id: <20170529144538.29187-3-mylene.josserand@...e-electrons.com>
> > > Signed-off-by: Alistair Francis <alistair@...stair23.me>
> >
> > > +title: Cypress cyttsp touchscreen controller, generation 5
> > (...)
> > > +  compatible:
> > > +    const: cypress,cyttsp5
> >
> > Is this the real product name? When I rewrote the bindings for
> > the original "CYTTSP", actually "Cypress TrueTouch Standard Product"
> > it came out that the actual product names were CY8CTMA340
> > and CY8CTMA341. "CYTTSP" was a marketing name for the
> > whole family.
> >
> > See
> > Documentation/devicetree/bindings/input/touchscreen/cypress,cy8ctma340.yaml
> >
> > If the actual products have some product names such as
> > CY8* then use these as compatibles instead and just write in the
> > decription that it is Cypress TrueTouch Standard Product series 5.
> >
> Since I have uptreamed 4 devicetrees containing that touchscreen (and
> marked that as todo). I tried to look it up:
> https://fccid.io/NOIKBN249/Internal-Photos/Internal-Photos-3802584.pdf
>
> Page 4 might be interesting. Something below that 3d code (zbarimg does
> not recognize it) Peeling up the label reveals:
> TT21000
> -44LQI
> 1802 TWN
> 6491U0 (two illegible characters)
>
> You find it in the net:
> https://www.digipart.com/part/TT21000-48LQI36T

Thanks!

So I'll change the name to cypress,tt21000

Alistair

>
> Regards,
> Andreas
>