Re: [PATCH v2 1/2] dt-bindings: chrome: Add binding for ChromeOS Pogo pin connector

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 6.02.2025 12:30 AM, Stephen Boyd wrote:
> Describe the set of pins used to connect the detachable keyboard on
> detachable ChromeOS devices. The set of pins is called the "pogo pins".
> It's basically USB 2.0 with an extra pin for base detection. We expect
> to find a keyboard on the other side of this connector with a specific
> vid/pid, so describe that as a child device at the port of the usb
> device connected upstream.
> 
> Cc: Rob Herring <robh@kernel.org>
> Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
> Cc: Conor Dooley <conor+dt@kernel.org>
> Cc: Benson Leung <bleung@chromium.org>
> Cc: <devicetree@vger.kernel.org>
> Cc: <chrome-platform@lists.linux.dev>
> Cc: Pin-yen Lin <treapking@chromium.org>
> Signed-off-by: Stephen Boyd <swboyd@chromium.org>
> ---
>  .../chrome/google,pogo-pin-connector.yaml     | 68 +++++++++++++++++++
>  1 file changed, 68 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/chrome/google,pogo-pin-connector.yaml
> 
> diff --git a/Documentation/devicetree/bindings/chrome/google,pogo-pin-connector.yaml b/Documentation/devicetree/bindings/chrome/google,pogo-pin-connector.yaml
> new file mode 100644
> index 000000000000..622e171b6b08
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/chrome/google,pogo-pin-connector.yaml
> @@ -0,0 +1,68 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/chrome/google,pogo-pin-connector.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Google Pogo Pin Connector

This looks like a very generic piece of hw.. many boards (esp. convertibles)
do the same thing, with 4 or 5 pins on the bottom of the device.

But of course hw manufacturers being hw manufacturers, many different kinds
of signals go through such connectors - if it's not USB then it's perhaps
I2C or some variation thereof

IMO, we could perhaps add this to usb-connector.yaml as "usb-custom-connector"
or so

Konrad