linux-kernel - Re: [RFC PATCH v2 1/2] dt-bindings: usb: Add DT bindings for Microchip sama7g5 tcpc

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Message-ID: <20210401171603.GA624021@robh.at.kernel.org>
Date:   Thu, 1 Apr 2021 12:16:03 -0500
From:   Rob Herring <robh@...nel.org>
To:     cristian.birsan@...rochip.com
Cc:     linux@...ck-us.net, heikki.krogerus@...ux.intel.com,
        gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/2] dt-bindings: usb: Add DT bindings for
 Microchip sama7g5 tcpc

On Tue, Mar 30, 2021 at 11:54:41PM +0300, cristian.birsan@...rochip.com wrote:
> From: Cristian Birsan <cristian.birsan@...rochip.com>
> 
> This patch adds DT bindings for the new Microchip USB Type-C Port
> Controller (TCPC) embedded in sama7g5 SoC.
> 
> Signed-off-by: Cristian Birsan <cristian.birsan@...rochip.com>
> ---
>  .../bindings/usb/microchip,sama7g5-tcpc.yaml  | 90 +++++++++++++++++++
>  1 file changed, 90 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/microchip,sama7g5-tcpc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/microchip,sama7g5-tcpc.yaml b/Documentation/devicetree/bindings/usb/microchip,sama7g5-tcpc.yaml
> new file mode 100644
> index 000000000000..2d3289dd9ac9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/microchip,sama7g5-tcpc.yaml
> @@ -0,0 +1,90 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/usb/microchip,sama7g5-tcpc.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Microchip SAMA7G5 Type-C port controller bindings
> +
> +maintainers:
> +  - Cristian Birsan <cristian.birsan@...rochip.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - microchip,sama7g5-tcpc
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Peripheral Bus Clock
> +      - description: Generic Clock
> +
> +  clock-names:
> +    items:
> +      - const: pclk
> +      - const: gclk
> +
> +  vbus-supply:
> +    description: vbus power supply (5V) phandle

This belongs in the connector node unless this chip uses Vbus as a 
supply.

> +
> +  microchip,vbus-gpio:
> +    description: vbus detect gpio

We have standard property for this in the connector node.

> +
> +  connector:
> +    type: object
> +
> +    allOf:
> +      - $ref: ../connector/usb-connector.yaml

You can drop 'allOf'. And add:

       unevaluatedProperties: false

> +
> +    properties:
> +      compatible:
> +        const: usb-c-connector
> +
> +      power-role: true
> +
> +    required:
> +      - compatible
> +
> +required:
> +  - compatible
> +  - reg
> +  - connector
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/at91.h>
> +    #include <dt-bindings/usb/pd.h>
> +    tcpcb: tcpcb@...44000 {
> +      compatible = "microchip,sama7g5-tcpc";
> +      reg = <0xe0844000 0x3fff>;
> +      clocks = <&pmc PMC_TYPE_PERIPHERAL 95>, <&pmc PMC_TYPE_GCK 95>;
> +      clock-names = "pclk", "gclk";
> +
> +      usb_con: connector {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        compatible = "usb-c-connector";
> +        label = "USB-C";
> +        data-role = "device";
> +        power-role = "sink";
> +        try-power-role = "sink";
> +        source-pdos = <PDO_FIXED(5000, 500,
> +            PDO_FIXED_USB_COMM)>;
> +        sink-pdos = <PDO_FIXED(5000, 500,
> +            PDO_FIXED_USB_COMM)>;
> +        op-sink-microwatt = <2500000>;
> +
> +        port@1 {
> +          reg = <1>;
> +          usb_con_hs: endpoint {
> +            remote-endpoint = <&usb_phy1>;
> +          };
> +        };
> +      };
> +    };
> +...
> -- 
> 2.25.1
>