diff mbox series

[v2,1/3] dt-bindings: connector: usb: add altmodes description

Message ID 20231113221528.749481-2-dmitry.baryshkov@linaro.org
State New
Headers show
Series dt-bindings: connector: usb: provide bindings for altmodes | expand

Commit Message

Dmitry Baryshkov Nov. 13, 2023, 10:13 p.m. UTC
Add description of the USB-C AltModes supported on the particular USB-C
connector. This is required for devices like Qualcomm Robotics RB5,
which have no other way to express alternative modes supported by the
hardware platform.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 .../bindings/connector/usb-connector.yaml     | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)

Comments

Rob Herring (Arm) Nov. 16, 2023, 6:38 p.m. UTC | #1
On Tue, Nov 14, 2023 at 12:13:27AM +0200, Dmitry Baryshkov wrote:
> Add description of the USB-C AltModes supported on the particular USB-C
> connector. This is required for devices like Qualcomm Robotics RB5,
> which have no other way to express alternative modes supported by the
> hardware platform.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>  .../bindings/connector/usb-connector.yaml     | 36 +++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> index 7c8a3e8430d3..1bd51b86906f 100644
> --- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
> +++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> @@ -14,6 +14,31 @@ description:
>    of a USB interface controller or a separate node when it is attached to both
>    MUX and USB interface controller.
>  
> +$defs:

I fail to see why we need to use $defs here.

> +  altmode-desc:
> +    type: object
> +    description:
> +      A single USB-C Alternative Mode as supported by the USB-C connector logic.
> +    properties:
> +      svid:
> +        $ref: /schemas/types.yaml#/definitions/uint16
> +        description: Unique value assigned by USB-IF to the Vendor / AltMode.
> +      vdo:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: VDO returned by Discover Modes USB PD command.

What's VDO?

These names are a bit short. Types for property names are global 
(mostly). Though this patch doesn't make it clear these were already in 
use.

> +
> +  altmodes-list:
> +    type: object
> +    description: List of Alternative Modes supported by the schematics on the
> +      particular device. This is only necessary if there are no other means to
> +      discover supported alternative modes (e.g. through the UCSI firmware
> +      interface).
> +
> +    patternProperties:
> +      "^[a-z][a-z0-9]*$":

Are there standard id's and names? Should we define some so we don't get 
'dp', 'displayport', etc.


> +        $ref: "#/$defs/altmode-desc"
> +        unevaluatedProperties: false
> +
>  properties:
>    compatible:
>      oneOf:
> @@ -171,6 +196,10 @@ properties:
>        offer the power, Capability Mismatch is set. Required for power sink and
>        power dual role.
>  
> +  altmodes:
> +    $ref: "#/$defs/altmodes-list"
> +    unevaluatedProperties: false
> +
>    port:
>      $ref: /schemas/graph.yaml#/properties/port
>      description: OF graph bindings modeling a data bus to the connector, e.g.
> @@ -289,6 +318,13 @@ examples:
>              compatible = "usb-c-connector";
>              label = "USB-C";
>  
> +            altmodes {
> +                displayport {
> +                    svid = /bits/ 16 <0xff01>;
> +                    vdo = <0x00001c46>;
> +                };
> +            };
> +
>              ports {
>                  #address-cells = <1>;
>                  #size-cells = <0>;
> -- 
> 2.42.0
>
Dmitry Baryshkov Nov. 16, 2023, 8:48 p.m. UTC | #2
On Thu, 16 Nov 2023 at 20:38, Rob Herring <robh@kernel.org> wrote:
>
> On Tue, Nov 14, 2023 at 12:13:27AM +0200, Dmitry Baryshkov wrote:
> > Add description of the USB-C AltModes supported on the particular USB-C
> > connector. This is required for devices like Qualcomm Robotics RB5,
> > which have no other way to express alternative modes supported by the
> > hardware platform.
> >
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> > ---
> >  .../bindings/connector/usb-connector.yaml     | 36 +++++++++++++++++++
> >  1 file changed, 36 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> > index 7c8a3e8430d3..1bd51b86906f 100644
> > --- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
> > +++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> > @@ -14,6 +14,31 @@ description:
> >    of a USB interface controller or a separate node when it is attached to both
> >    MUX and USB interface controller.
> >
> > +$defs:
>
> I fail to see why we need to use $defs here.

I had an idea of defining a schema piece that can later be referenced
from any other place. If you think this is an overkill, I can drop
them.

>
> > +  altmode-desc:
> > +    type: object
> > +    description:
> > +      A single USB-C Alternative Mode as supported by the USB-C connector logic.
> > +    properties:
> > +      svid:
> > +        $ref: /schemas/types.yaml#/definitions/uint16
> > +        description: Unique value assigned by USB-IF to the Vendor / AltMode.
> > +      vdo:
> > +        $ref: /schemas/types.yaml#/definitions/uint32
> > +        description: VDO returned by Discover Modes USB PD command.
>
> What's VDO?

Ack, I'll expand it in v3

>
> These names are a bit short. Types for property names are global
> (mostly). Though this patch doesn't make it clear these were already in
> use.
>
> > +
> > +  altmodes-list:
> > +    type: object
> > +    description: List of Alternative Modes supported by the schematics on the
> > +      particular device. This is only necessary if there are no other means to
> > +      discover supported alternative modes (e.g. through the UCSI firmware
> > +      interface).
> > +
> > +    patternProperties:
> > +      "^[a-z][a-z0-9]*$":
>
> Are there standard id's and names? Should we define some so we don't get
> 'dp', 'displayport', etc.

Indeed it might be better to enumerate them via string enumeration.

>
>
> > +        $ref: "#/$defs/altmode-desc"
> > +        unevaluatedProperties: false
> > +
> >  properties:
> >    compatible:
> >      oneOf:
> > @@ -171,6 +196,10 @@ properties:
> >        offer the power, Capability Mismatch is set. Required for power sink and
> >        power dual role.
> >
> > +  altmodes:
> > +    $ref: "#/$defs/altmodes-list"
> > +    unevaluatedProperties: false
> > +
> >    port:
> >      $ref: /schemas/graph.yaml#/properties/port
> >      description: OF graph bindings modeling a data bus to the connector, e.g.
> > @@ -289,6 +318,13 @@ examples:
> >              compatible = "usb-c-connector";
> >              label = "USB-C";
> >
> > +            altmodes {
> > +                displayport {
> > +                    svid = /bits/ 16 <0xff01>;
> > +                    vdo = <0x00001c46>;
> > +                };
> > +            };
> > +
> >              ports {
> >                  #address-cells = <1>;
> >                  #size-cells = <0>;
> > --
> > 2.42.0
> >
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
index 7c8a3e8430d3..1bd51b86906f 100644
--- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
+++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
@@ -14,6 +14,31 @@  description:
   of a USB interface controller or a separate node when it is attached to both
   MUX and USB interface controller.
 
+$defs:
+  altmode-desc:
+    type: object
+    description:
+      A single USB-C Alternative Mode as supported by the USB-C connector logic.
+    properties:
+      svid:
+        $ref: /schemas/types.yaml#/definitions/uint16
+        description: Unique value assigned by USB-IF to the Vendor / AltMode.
+      vdo:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: VDO returned by Discover Modes USB PD command.
+
+  altmodes-list:
+    type: object
+    description: List of Alternative Modes supported by the schematics on the
+      particular device. This is only necessary if there are no other means to
+      discover supported alternative modes (e.g. through the UCSI firmware
+      interface).
+
+    patternProperties:
+      "^[a-z][a-z0-9]*$":
+        $ref: "#/$defs/altmode-desc"
+        unevaluatedProperties: false
+
 properties:
   compatible:
     oneOf:
@@ -171,6 +196,10 @@  properties:
       offer the power, Capability Mismatch is set. Required for power sink and
       power dual role.
 
+  altmodes:
+    $ref: "#/$defs/altmodes-list"
+    unevaluatedProperties: false
+
   port:
     $ref: /schemas/graph.yaml#/properties/port
     description: OF graph bindings modeling a data bus to the connector, e.g.
@@ -289,6 +318,13 @@  examples:
             compatible = "usb-c-connector";
             label = "USB-C";
 
+            altmodes {
+                displayport {
+                    svid = /bits/ 16 <0xff01>;
+                    vdo = <0x00001c46>;
+                };
+            };
+
             ports {
                 #address-cells = <1>;
                 #size-cells = <0>;