linux-kernel - [PATCH v3 1/4] dt-bindings: Add cros-ec Type C port driver

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Message-Id: <20200220003102.204480-2-pmalani@chromium.org>
Date:   Wed, 19 Feb 2020 16:30:55 -0800
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     heikki.krogerus@...el.com, enric.balletbo@...labora.com,
        bleung@...omium.org, Prashant Malani <pmalani@...omium.org>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS), Guenter Roeck <groeck@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>
Subject: [PATCH v3 1/4] dt-bindings: Add cros-ec Type C port driver

Some Chrome OS devices with Embedded Controllers (EC) can read and
modify Type C port state.

Add an entry in the DT Bindings documentation that lists out the logical
device and describes the relevant port information, to be used by the
corresponding driver.

Signed-off-by: Prashant Malani <pmalani@...omium.org>
---

Changes in v3:
- Fixed license identifier.
- Renamed "port" to "connector".
- Made "connector" be a "usb-c-connector" compatible property.
- Updated port-number description to explain min and max values,
  and removed $ref which was causing dt_binding_check errors.
- Fixed power-role, data-role and try-power-role details to make
  dt_binding_check pass.
- Fixed example to include parent EC SPI DT Node.

Changes in v2:
- No changes. Patch first introduced in v2 of series.

 .../bindings/chrome/google,cros-ec-typec.yaml | 86 +++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/chrome/google,cros-ec-typec.yaml

diff --git a/Documentation/devicetree/bindings/chrome/google,cros-ec-typec.yaml b/Documentation/devicetree/bindings/chrome/google,cros-ec-typec.yaml
new file mode 100644
index 00000000000000..97fd982612f120
--- /dev/null
+++ b/Documentation/devicetree/bindings/chrome/google,cros-ec-typec.yaml
@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/chrome/google,cros-ec-typec.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Google Chrome OS EC(Embedded Controller) Type C port driver.
+
+maintainers:
+  - Benson Leung <bleung@...omium.org>
+  - Prashant Malani <pmalani@...omium.org>
+
+description:
+  Chrome OS devices have an Embedded Controller(EC) which has access to
+  Type C port state. This node is intended to allow the host to read and
+  control the Type C ports. The node for this device should be under a
+  cros-ec node like google,cros-ec-spi.
+
+properties:
+  compatible:
+    const: google,cros-ec-typec
+
+  connector:
+    description: A node that represents a physical Type C connector port
+      on the device.
+    type: object
+    properties:
+      compatible:
+        const: usb-c-connector
+      port-number:
+        description: The number used by the Chrome OS EC to identify
+          this type C port. Valid values are 0 - (EC_USB_PD_MAX_PORTS - 1).
+      power-role:
+        description: Determines the power role that the Type C port will
+          adopt.
+        maxItems: 1
+        contains:
+          enum:
+            - sink
+            - source
+            - dual
+      data-role:
+        description: Determines the data role that the Type C port will
+          adopt.
+        maxItems: 1
+        contains:
+          enum:
+            - host
+            - device
+            - dual
+      try-power-role:
+        description: Determines the preferred power role of the Type C port.
+        maxItems: 1
+        contains:
+          enum:
+            - sink
+            - source
+            - dual
+
+    required:
+      - port-number
+      - power-role
+      - data-role
+      - try-power-role
+
+required:
+  - compatible
+  - connector
+
+examples:
+  - |+
+    cros_ec: ec@0 {
+      compatible = "google,cros-ec-spi";
+
+      typec {
+        compatible = "google,cros-ec-typec";
+
+        usb_con: connector {
+          compatible = "usb-c-connector";
+          port-number = <0>;
+          power-role = "dual";
+          data-role = "dual";
+          try-power-role = "source";
+        };
+      };
+    };
-- 
2.25.0.265.gbab2e86ba0-goog