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

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Date:   Tue, 26 Oct 2021 01:18:24 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Alistair Francis <alistair@...stair23.me>
Cc:     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>,
        Andreas Kemnade <andreas@...nade.info>, alistair23@...il.com,
        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

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.

Yours,
Linus Walleij