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Date: Thu, 05 Mar 2020 13:20:04 -0800
From: Stephen Boyd <swboyd@...omium.org>
To: Prashant Malani <pmalani@...omium.org>, devicetree@...r.kernel.org
Cc: bleung@...omium.org, heikki.krogerus@...ux.intel.com,
enric.balletbo@...labora.com,
Prashant Malani <pmalani@...omium.org>,
Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
Chunfeng Yun <chunfeng.yun@...iatek.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Linus Walleij <linus.walleij@...aro.org>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-mediatek@...ts.infradead.org, linux-usb@...r.kernel.org,
Mark Rutland <mark.rutland@....com>,
Matthias Brugger <matthias.bgg@...il.com>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2] dt-bindings: Convert usb-connector to YAML format.
Quoting Prashant Malani (2020-03-04 19:01:30)
> diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> new file mode 100644
> index 0000000000000..b386e2880405c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> @@ -0,0 +1,203 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/connector/usb-connector.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: USB Connector
> +
> +maintainers:
> + - linux-usb@...r.kernel.org
> +
> +description:
> + A USB connector node represents a physical USB connector. It should be a child
> + of a USB interface controller.
> +
> +properties:
> + compatible:
> + enum:
> + - usb-a-connector
> + - usb-b-connector
> + - usb-c-connector
> +
> + label:
> + description: Symbolic name for the connector.
> +
> + type:
> + description: Size of the connector, should be specified in case of USB-A,
> + USB-B non-fullsize connectors.
Maybe "should be specified in case of non-fullsize 'usb-a-connector' or
'usb-b-connector' compatible connectors"?
> + $ref: /schemas/types.yaml#definitions/string
> + enum:
> + - mini
> + - micro
> +
> + self-powered:
> + description: Set this property if the USB device has its own power source.
> + type: boolean
> +
> + # The following are optional properties for "usb-b-connector".
> + id-gpios:
> + description: An input gpio for USB ID pin.
> + maxItems: 1
> +
> + vbus-gpios:
> + description: An input gpio for USB VBus pin, used to detect presence of
> + VBUS 5V. See gpio/gpio.txt.
Can this be written as bindings/gpio/gpio.txt?
> + maxItems: 1
> +
> + vbus-supply:
> + description: A phandle to the regulator for USB VBUS if needed when host
> + mode or dual role mode is supported.
> + Particularly, if use an output GPIO to control a VBUS regulator, should
> + model it as a regulator. See regulator/fixed-regulator.yaml
And bindings/regulator/fixed-regulator.yaml? The idea is to
disambiguate from kernel Documentation/ directory.
> +
> + # The following are optional properties for "usb-c-connector".
Is there a way to constrain the binding so that this can't be put in a
connector that doesn't have the usb-c-connector compatible string?
> + power-role:
> + description: Determines the power role that the Type C connector will
> + support. "dual" refers to Dual Role Port (DRP).
> + allOf:
> + - $ref: /schemas/types.yaml#definitions/string
> + enum:
> + - source
> + - sink
> + - dual
> +
> + try-power-role:
> + description: Preferred power role.
> + allOf:
> + - $ref: /schemas/types.yaml#definitions/string
> + enum:
> + - source
> + - sink
> + - dual
> +
> + data-role:
> + description: Data role if Type C connector supports USB data. "dual" refers
> + Dual Role Device (DRD).
> + allOf:
> + - $ref: /schemas/types.yaml#definitions/string
> + enum:
> + - host
> + - device
> + - dual
Is there a way to maintain a description for each possible string
property? Then we could move the last sentence in the description above
to be attached to '- dual' here.
> +
> + # The following are optional properties for "usb-c-connector" with power
> + # delivery support.
> + source-pdos:
> + description: An array of u32 with each entry providing supported power
> + source data object(PDO), the detailed bit definitions of PDO can be found
> + in "Universal Serial Bus Power Delivery Specification" chapter 6.4.1.2
> + Source_Capabilities Message, the order of each entry(PDO) should follow
> + the PD spec chapter 6.4.1. Required for power source and power dual role.
> + User can specify the source PDO array via PDO_FIXED/BATT/VAR/PPS_APDO()
> + defined in dt-bindings/usb/pd.h.
> + minItems: 1
> + maxItems: 7
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint32-array
> +
> + sink-pdos:
> + description: An array of u32 with each entry providing supported power sink
> + data object(PDO), the detailed bit definitions of PDO can be found in
> + "Universal Serial Bus Power Delivery Specification" chapter 6.4.1.3
> + Sink Capabilities Message, the order of each entry(PDO) should follow the
> + PD spec chapter 6.4.1. Required for power sink and power dual role. User
> + can specify the sink PDO array via PDO_FIXED/BATT/VAR/PPS_APDO() defined
> + in dt-bindings/usb/pd.h.
> + minItems: 1
> + maxItems: 7
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint32-array
> +
> + op-sink-microwatt:
> + description: Sink required operating power in microwatt, if source can't
> + offer the power, Capability Mismatch is set. Required for power sink and
> + power dual role.
> +
> + ports:
> + description: OF graph bindings (specified in bindings/graph.txt) that model
> + any data bus to the connector unless the bus is between parent node and
> + the connector. Since a single connector can have multiple data buses every
> + bus has assigned OF graph port number as described below.
has an assigned?
> + type: object
> + properties:
> + port@0:
> + type: object
> + description: High Speed (HS), present in all connectors.
> +
> + port@1:
> + type: object
> + description: Super Speed (SS), present in SS capable connectors.
> +
> + port@2:
> + type: object
> + description: Sideband Use (SBU), present in USB-C.
Likewise, is it possible to constrain this to only usb-c-connector
compatible string based bindings? And if so, does it become required for
that compatible string?
> +
> + required:
> + - port@0
> +
> +required:
> + - compatible
> +
> +examples:
> + # Micro-USB connector with HS lines routed via controller (MUIC).
> + - |+
> + muic-max77843@66 {
Add a reg = <0x66>; here? Or drop the unit address above.
> + usb_con1: connector {
> + compatible = "usb-b-connector";
> + label = "micro-USB";
> + type = "micro";
> + };
> + };
> +
> + # USB-C connector attached to CC controller (s2mm005), HS lines routed
> + # to companion PMIC (max77865), SS lines to USB3 PHY and SBU to DisplayPort.
> + # DisplayPort video lines are routed to the connector via SS mux in USB3 PHY.
> + - |+
> + ccic: s2mm005@33 {
Same unit address comment.
> + usb_con2: connector {
> + compatible = "usb-c-connector";
> + label = "USB-C";
> +
> + ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + port@0 {
> + reg = <0>;
> + usb_con_hs: endpoint {
> + remote-endpoint = <&max77865_usbc_hs>;
> + };
> + };
> + port@1 {
> + reg = <1>;
> + usb_con_ss: endpoint {
> + remote-endpoint = <&usbdrd_phy_ss>;
> + };
> + };
> + port@2 {
> + reg = <2>;
> + usb_con_sbu: endpoint {
> + remote-endpoint = <&dp_aux>;
> + };
Tabs should be replaced with spaces.
> + };
> + };
> + };
> + };
> +
> + # USB-C connector attached to a typec port controller(ptn5110), which has
> + # power delivery support and enables drp.
> + - |+
> + #include <dt-bindings/usb/pd.h>
> + typec: ptn5110@50 {
Same unit address comment.
> + usb_con3: connector {
> + compatible = "usb-c-connector";
> + label = "USB-C";
> + power-role = "dual";
> + try-power-role = "sink";
> + source-pdos = <PDO_FIXED(5000, 2000, PDO_FIXED_USB_COMM)>;
> + sink-pdos = <PDO_FIXED(5000, 2000, PDO_FIXED_USB_COMM)
> + PDO_VAR(5000, 12000, 2000)>;
> + op-sink-microwatt = <10000000>;
> + };
> + };
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