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

[Andreas Kemnade]

On Tue, 26 Oct 2021 01:18:24 +0200
Linus Walleij <linus.walleij@xxxxxxxxxx> wrote:

> Hi Alistair,
> 
> On Mon, Oct 25, 2021 at 1:42 PM Alistair Francis <alistair@xxxxxxxxxxxxx> wrote:
> 
> > From: Mylène Josserand <mylene.josserand@xxxxxxxxxxxxxxxxxx>
> >
> > 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@xxxxxxxxxxxxxxxxxx>
> > Message-Id: <20170529144538.29187-3-mylene.josserand@xxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Alistair Francis <alistair@xxxxxxxxxxxxx>  
> 
> > +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

Regards,
Andreas