[PATCH 4/8] dt-bindings: usb: dwc3: Add Amlogic G12A DWC3 Glue Bindings

[Neil Armstrong]

Adds the bindings for the Amlogic G12A USB Glue HW.

The Amlogic G12A SoC Family embeds 2 USB Controllers :
- a DWC3 IP configured as Host for USB2 and USB3
- a DWC2 IP configured as Peripheral USB2 Only

A glue connects these both controllers to 2 USB2 PHYs,
and optionnally to an USB3+PCIE Combo PHY shared with the PCIE controller.

The Glue configures the UTMI 8bit interfaces for the USB2 PHYs, including
routing of the OTG PHY between the DWC3 and DWC2 controllers, and
setups the on-chip OTG mode selection for this PHY.

The PHYs are children of the Glue node since the Glue controls the interface
with the PHY, not the DWC3 controller.

The PHY interconnect is handled into ports subnodes, which eases describing
which PHY is enabled (like the USB3 shared PHY) and futures layouts on
derivatives of the G12A Family.

Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
---
 .../devicetree/bindings/usb/amlogic,dwc3.txt  | 109 ++++++++++++++++++
 1 file changed, 109 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/amlogic,dwc3.txt b/Documentation/devicetree/bindings/usb/amlogic,dwc3.txt
index 9a8b631904fd..c7c4726ef10d 100644
--- a/Documentation/devicetree/bindings/usb/amlogic,dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/amlogic,dwc3.txt
@@ -40,3 +40,112 @@ Example device nodes:
 				phy-names = "usb2-phy", "usb3-phy";
 			};
 		};
+
+Amlogic Meson G12A DWC3 USB SoC Controller Glue
+
+The Amlogic G12A embeds a DWC3 USB IP Core configured for USB2 and USB3
+in host-only mode, and a DWC2 IP Core configured for USB2 peripheral mode
+only.
+
+A glue connects the DWC3 core to USB2 PHYs and optionnaly to an USB3 PHY.
+
+One of the USB2 PHY can be re-routed in peripheral mode to a DWC2 USB IP.
+
+The DWC3 Glue controls the PHY routing and power, an interrupt line is
+connected to the Glue to serve as OTG ID change detection.
+
+Required properties:
+- compatible:	Should be "amlogic,meson-g12a-usb-ctrl"
+- clocks:	a handle for the "USB" clock
+- clock-names:	must be "usb"
+- resets:	a handle for the shared "USB" reset line
+- reset-names:	must be "usb"
+- reg:		The base address and length of the registers
+- interrupts:	the interrupt specifier for the OTG detection
+
+Required child nodes:
+
+USB Ports are described as child 'port' nodes grouped under a 'ports' node,
+with #address-cells, #size-cells specified.
+
+Each 'port' sub-node identifies a possible USB Port served by an USB PHY
+identified by the 'phy' property as decribed in ../phy/phy-bindings.txt
+
+Each 'port' is identified by a reg property to number the port.
+
+The following table lists for each supported model the port number
+corresponding to each PHY serving a physical USB Port.
+
+ Family	   Port 0     Port 1    Port 2    Port 3    Port 4
+---------------------------------------------------------------
+ G12A	   USBHOST_A  USBOTG_B  Reserved  Reserved  USB3_0
+
+A child node must exist to represent the core DWC3 IP block. The name of
+the node is not important. The content of the node is defined in dwc3.txt.
+
+A child node must exist to represent the core DWC2 IP block. The name of
+the node is not important. The content of the node is defined in dwc2.txt.
+
+PHY documentation is provided in the following places:
+- Documentation/devicetree/bindings/phy/meson-g12a-usb2-phy.txt
+- Documentation/devicetree/bindings/phy/meson-g12a-usb3-pcie-phy.txt
+
+
+Example device nodes:
+	usb: usb@ffe09000 {
+			compatible = "amlogic,meson-g12a-usb-ctrl";
+			reg = <0x0 0xffe09000 0x0 0xa0>;
+			interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
+			#address-cells = <2>;
+			#size-cells = <2>;
+			ranges;
+
+			clocks = <&clkc CLKID_USB>;
+			clock-names = "usb";
+			resets = <&reset RESET_USB>;
+			reset-names = "usb";
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				/* USB2 Port 0 */
+				usb20: port@0 {
+					reg = <0>;
+					phys = <&usb2_phy0>;
+				};
+
+				/* USB2 Port 1 */
+				usb21: port@1 {
+					reg = <1>;
+					phys = <&usb2_phy1>;
+				};
+
+				/* USB3 Port 0 */
+				usb3: port@4 {
+					reg = <4>;
+					phys = <&usb3_pcie_phy PHY_TYPE_USB3>;
+				};
+			};
+
+			dwc2: usb@ff400000 {
+				compatible = "amlogic,meson-g12a-usb", "snps,dwc2";
+				reg = <0x0 0xff400000 0x0 0x40000>;
+				interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
+				clocks = <&clkc CLKID_USB1_DDR_BRIDGE>;
+				clock-names = "ddr";
+				dr_mode = "peripheral";
+				g-rx-fifo-size = <192>;
+				g-np-tx-fifo-size = <128>;
+				g-tx-fifo-size = <128 128 16 16 16>;
+			};
+
+			dwc3: dwc3@ff500000 {
+				compatible = "snps,dwc3";
+				reg = <0x0 0xff500000 0x0 0x100000>;
+				interrupts = <GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>;
+				dr_mode = "host";
+				snps,dis_u2_susphy_quirk;
+				snps,quirk-frame-length-adjustment;
+			};
+	};
-- 
2.20.1