[PATCH v2 1/2] dt-bindings: usb: Add Apple dwc3 bindings

[Sven Peter <sven@svenpeter.dev>]

Apple Silicon SoCs such as the M1 have multiple USB controllers based on
the Synopsys DesignWare USB3 controller.
References to the ATC PHY required for SuperSpeed are left out for now
until support has been upstreamed as well.

Signed-off-by: Sven Peter <sven@svenpeter.dev>
---
v1 -> v2:
 - added apple,dwc3 bindings instead of a property for the reset quirk
   as requested by robh

I think I have to use GPL-2.0 for this binding since it's based
on and references snps,dwc3.yaml which is also only GPL-2.0.
Otherwise I'd be fine with the usual GPL/BSD dual license as well.

 .../devicetree/bindings/usb/apple,dwc3.yaml   | 64 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 65 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/apple,dwc3.yaml

diff --git a/Documentation/devicetree/bindings/usb/apple,dwc3.yaml b/Documentation/devicetree/bindings/usb/apple,dwc3.yaml
new file mode 100644
index 000000000000..fb3b3489e6b2
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/apple,dwc3.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/apple,dwc3.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple Silicon DWC3 USB controller
+
+maintainers:
+  - Sven Peter <sven@svenpeter.dev>
+
+description:
+  On Apple Silicon SoCs such as the M1 each Type-C port has a corresponding
+  USB controller based on the Synopsys DesignWare USB3 controller.
+
+  The common content of this binding is defined in snps,dwc3.yaml.
+
+allOf:
+  - $ref: snps,dwc3.yaml#
+
+select:
+  properties:
+    compatible:
+      contains:
+        const: apple,dwc3
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apple,t8103-dwc3
+          - apple,t6000-dwc3
+      - const: apple,dwc3
+      - const: snps,dwc3
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/apple-aic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    usb@82280000 {
+      compatible = "apple,t8103-dwc3", "apple,dwc3", "snps,dwc3";
+      reg = <0x82280000 0x10000>;
+      interrupts = <AIC_IRQ 777 IRQ_TYPE_LEVEL_HIGH>;
+
+      dr_mode = "otg";
+      usb-role-switch;
+      role-switch-default-mode = "host";
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 3b79fd441dde..03e7cc48877a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1724,6 +1724,7 @@ T:	git https://github.com/AsahiLinux/linux.git
 F:	Documentation/devicetree/bindings/arm/apple.yaml
 F:	Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
 F:	Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
+F:	Documentation/devicetree/bindings/usb/apple,dwc3.yaml
 F:	arch/arm64/boot/dts/apple/
 F:	drivers/irqchip/irq-apple-aic.c
 F:	include/dt-bindings/interrupt-controller/apple-aic.h
-- 
2.25.1