[PATCH v7 7/8] dt-bindings: misc: Add bindings for HiSilicon usb hub and data role switch functionality on HiKey960

[John Stultz <john.stultz@linaro.org>]

From: Yu Chen <chenyu56@huawei.com>

This patch adds binding documentation to support usb hub and usb
data role switch of Hisilicon HiKey960 Board.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
CC: ShuFan Lee <shufan_lee@richtek.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Yu Chen <chenyu56@huawei.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jun Li <lijun.kernel@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Guillaume Gardet <Guillaume.Gardet@arm.com>
Cc: Jack Pham <jackp@codeaurora.org>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: Yu Chen <chenyu56@huawei.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
v3: Reworked as usb-role-switch intermediary

v7: Switched over to YAML dt binding description
---
 .../bindings/misc/hisilicon-hikey-usb.yaml    | 85 +++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.yaml

diff --git a/Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.yaml b/Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.yaml
new file mode 100644
index 000000000000..1fc3b198ef73
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/hisilicon-hikey-usb.yaml
@@ -0,0 +1,85 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2019 Linaro Ltd.
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/misc/hisilicon-hikey-usb.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: HiKey960 onboard USB GPIO Hub
+
+maintainers:
+  - John Stultz <john.stultz@linaro.org>
+
+description: |
+  Supports the onboard HiKey960 USB GPIO hub, which acts as a
+  role-switch intermediary to detect the state of the USB-C
+  port, to switch the hub into dual-role USB-C or host mode,
+  which enables the onboard USB-A host ports.
+
+  Schematics about the hub can be found here:
+    https://github.com/96boards/documentation/raw/master/consumer/hikey/hikey960/hardware-docs/HiKey960_Schematics.pdf
+
+properties:
+  compatible:
+    items:
+      - const: hisilicon,gpio_hubv1
+
+  typec-vbus-gpios:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: phandle to the typec-vbus gpio
+
+  otg-switch-gpios:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: phandle to the otg-switch gpio
+
+  hub-vdd33-en-gpios:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: phandle to the hub 3.3v power enablement gpio
+
+  usb-role-switch:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: Support role switch.
+
+  port:
+    description: |
+      any connector to the data bus of this controller should be modelled
+      using the OF graph bindings specified, if the "usb-role-switch"
+      property is used. Note for this driver, two ports are supported,
+      the first being the endpoint that will be notified by this driver,
+      and the second being the endpoint that notifies this driver of a
+      role switch.
+
+
+required:
+  - compatible
+  - typec-vbus-gpios
+  - otg-switch-gpios
+  - hub-vdd33-en-gpios
+  - usb-role-switch
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    hisi_hikey_usb: hisi_hikey_usb {
+        compatible = "hisilicon,gpio_hubv1";
+        typec-vbus-gpios = <&gpio25 2 GPIO_ACTIVE_HIGH>;
+        otg-switch-gpios = <&gpio25 6 GPIO_ACTIVE_HIGH>;
+        hub-vdd33-en-gpios = <&gpio5 6 GPIO_ACTIVE_HIGH>;
+        usb-role-switch;
+
+        port {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            hikey_usb_ep0: endpoint@0 {
+                reg = <0>;
+                remote-endpoint = <&dwc3_role_switch>;
+            };
+            hikey_usb_ep1: endpoint@1 {
+                reg = <1>;
+                remote-endpoint = <&rt1711h_ep>;
+            };
+        };
+    };
-- 
2.17.1