Re: [PATCH v4 1/2] dt-bindings: Input: Add Wacom W9000-series penabled touchscreens

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Hi Hendrik,

On Sat, Mar 07, 2026 at 07:15:32PM +0100, Hendrik Noack wrote:
> Add bindings for Wacom W9002 and two Wacom W9007 variants which can be
> found in tablets.
> 
> Co-developed-by: Ferass El Hafidi <funderscore@postmarketos.org>
> Signed-off-by: Ferass El Hafidi <funderscore@postmarketos.org>
> Signed-off-by: Hendrik Noack <hendrik-noack@gmx.de>
> ---
>  .../input/touchscreen/wacom,w9007a-lt03.yaml  | 86 +++++++++++++++++++
>  1 file changed, 86 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/wacom,w9007a-lt03.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/wacom,w9007a-lt03.yaml b/Documentation/devicetree/bindings/input/touchscreen/wacom,w9007a-lt03.yaml
> new file mode 100644
> index 000000000000..feb87f5db39d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/wacom,w9007a-lt03.yaml
> @@ -0,0 +1,86 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/touchscreen/wacom,w9007a-lt03.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Wacom W9000-series penabled I2C touchscreen
> +
> +maintainers:
> +  - Hendrik Noack <hendrik-noack@gmx.de>
> +
> +description: |
> +  The W9000-series are penabled touchscreen controllers by Wacom.
> +
> +  The firmware of chips between devices can differ and with it also
> +  how the chips behaves.
> +
> +allOf:
> +  - $ref: touchscreen.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - wacom,w9002
> +      - wacom,w9007a-lt03
> +      - wacom,w9007a-v1
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  vdd-supply:
> +    description:
> +      Optional regulator for the VDD digital voltage.
> +
> +  flash-mode-gpios:
> +    maxItems: 1
> +    description:
> +      Optional GPIO specifier for the touchscreen's flash-mode pin.
> +
> +  pen-inserted-gpios:
> +    maxItems: 1
> +    description:
> +      Optional GPIO specifier for the touchscreen's pen-insert pin.

Looking at this again this has nothing to do with the W9000 touchscreen
controller. The behavior is applicable to any device with a touchscreen
and a pen.

Rather this is a generic functionality/policy to put the pen
interface in low power mode when it is put away. I think this should be
done by userspace through combination to listening to the
SW_PEN_INSERTED events (via gpio-keys driver) and toggling "inhibit" on
the touchscreen device.

Thanks.

-- 
Dmitry