linux-kernel - Re: [PATCH 18/22] dt-bindings: chrome: Add binding for ChromeOS Pogo pin connector

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Message-ID: <18ac05fb-a78d-4e95-a73d-461f509cdc5f@linaro.org>
Date: Sun, 11 Feb 2024 14:39:36 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Stephen Boyd <swboyd@...omium.org>, chrome-platform@...ts.linux.dev
Cc: linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, Douglas Anderson <dianders@...omium.org>,
 Pin-yen Lin <treapking@...omium.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Benson Leung <bleung@...omium.org>,
 Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH 18/22] dt-bindings: chrome: Add binding for ChromeOS Pogo
 pin connector

On 10/02/2024 08:09, 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+dt@...nel.org>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
> Cc: Conor Dooley <conor+dt@...nel.org>
> Cc: Benson Leung <bleung@...omium.org>
> Cc: Guenter Roeck <groeck@...omium.org>
> Cc: <devicetree@...r.kernel.org>
> Cc: <chrome-platform@...ts.linux.dev>
> Cc: Pin-yen Lin <treapking@...omium.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  .../chrome/google,pogo-pin-connector.yaml     | 61 +++++++++++++++++++
>  1 file changed, 61 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..5ba68fd95fcd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/chrome/google,pogo-pin-connector.yaml
> @@ -0,0 +1,61 @@
> +# 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
> +
> +maintainers:
> +  - Stephen Boyd <swboyd@...omium.org>
> +

Missing description describing the hardware.

> +properties:
> +  compatible:
> +    const: google,pogo-pin-connector
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  port:
> +    $ref: /schemas/graph.yaml#/properties/port
> +    description: Connection to USB2 port providing USB signals
> +    required:
> +      - endpoint

Drop required.


> +
> +patternProperties:
> +  "^keyboard@[0-9a-f]{1,2}$":
> +    description: The detachable keyboard

If this is detachable why do you define it in DT? Only hard-wired USB
devices, which need some sort of special handling. are described in DT.

> +    type: object
> +    $ref: /schemas/usb/usb-device.yaml

On this level:
unevaluatedProperties: false

> +
> +required:
> +  - compatible
> +  - '#address-cells'
> +  - '#size-cells'

Use one type of quotes, either ' or ".

> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    connector {
> +        compatible = "google,pogo-pin-connector";
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        keyboard@2 {
> +          compatible = "usb18d1,504c";

Messed indentation.

> +          reg = <2>;
> +        };
> +
Best regards,
Krzysztof