[PATCH v3 1/2] dt-bindings: usb: Add Samsung Exynos8855 DWC3 controller binding

[Selvarasu Ganesan <selvarasu.g@samsung.com>]

Add the Samsung Exynos8855 DWC3 binding using a flattened node
representation, where the DWC3 controller is directly addressable
rather than nested as a child node of a glue layer.

This is the first Samsung Exynos binding using the flattened
representation.

Co-developed-by: Muhammed Ali <muhammed.ali@samsung.com>
Signed-off-by: Muhammed Ali <muhammed.ali@samsung.com>
Signed-off-by: Selvarasu Ganesan <selvarasu.g@samsung.com>
---
 .../bindings/usb/samsung,exynos8855-dwc3.yaml | 74 +++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/samsung,exynos8855-dwc3.yaml

diff --git a/Documentation/devicetree/bindings/usb/samsung,exynos8855-dwc3.yaml b/Documentation/devicetree/bindings/usb/samsung,exynos8855-dwc3.yaml
new file mode 100644
index 000000000000..d8983c310d31
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/samsung,exynos8855-dwc3.yaml
@@ -0,0 +1,74 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/samsung,exynos8855-dwc3.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung Exynos8855 DWC3 USB controller
+
+maintainers:
+  - Krzysztof Kozlowski <krzk@kernel.org>
+  - Selvarasu Ganesan <selvarasu.g@samsung.com>
+
+description:
+  Describes the DWC3 USB controller block implemented on the Samsung
+  Exynos8855 SoC.
+
+properties:
+  compatible:
+    enum:
+      - samsung,exynos8855-dwc3
+
+  reg:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    description: |
+      Two clocks are used:
+       - ref: Reference clock for SOF/ITP generation.
+       - bus: Bus (APB) clock for register access.
+    minItems: 2
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: ref
+      - const: bus
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+
+allOf:
+  - $ref: snps,dwc3-common.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    usb@13200000 {
+        compatible = "samsung,exynos8855-dwc3";
+        reg = <0x13200000 0x10000>;
+        interrupts = <GIC_SPI 436 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&usb_clk 0>,
+                 <&usb_clk 1>;
+        clock-names = "ref", "bus";
+        dr_mode = "peripheral";
+        phys = <&usbdrd_phy 0>;
+        phy-names = "usb2-phy";
+        snps,quirk-frame-length-adjustment = <0x20>;
+        snps,dis-u2-freeclk-exists-quirk;
+        snps,gfladj-refclk-lpm-sel-quirk;
+    };
+...
-- 
2.17.1