[PATCH 1/7] dt-bindings: phy: rcar-gen2: Add r8a77470 support

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Add USB PHY support for r8a77470 SoC. Renesas RZ/G1C (R8A77470)
USB PHY is similar to the R-Car Gen2 family, but has the below
features compared to other RZ/G1 and R-Car Gen2/3 SoCs

It has a shared pll reset for usbphy0/usbphy1 and this register
reside in usbphy0 block

Each USB2.0 host needs to deassert the pll reset of usbphy0 block.

Signed-off-by: Biju Das <biju.das@xxxxxxxxxxxxxx>
---
 .../devicetree/bindings/phy/rcar-gen2-phy.txt      | 64 +++++++++++++++++++---
 1 file changed, 55 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt b/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt
index eeb9e18..0a59971 100644
--- a/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt
+++ b/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt
@@ -6,6 +6,7 @@ This file provides information on what the device node for the R-Car generation
 Required properties:
 - compatible: "renesas,usb-phy-r8a7743" if the device is a part of R8A7743 SoC.
 	      "renesas,usb-phy-r8a7745" if the device is a part of R8A7745 SoC.
+	      "renesas,usb-phy-r8a77470" if the device is a part of R8A77470 SoC.
 	      "renesas,usb-phy-r8a7790" if the device is a part of R8A7790 SoC.
 	      "renesas,usb-phy-r8a7791" if the device is a part of R8A7791 SoC.
 	      "renesas,usb-phy-r8a7794" if the device is a part of R8A7794 SoC.
@@ -23,13 +24,23 @@ Required properties:
 - clocks: clock phandle and specifier pair.
 - clock-names: string, clock input name, must be "usbhs".
 
+Optional properties (r8a77470 SoC Only):
+To use a USB channel as USB 2.0 Host, the device tree node should set below
+optional properties. This is because USB2.0 Host needs to deassert pll reset,
+apart from initializing interrupt enable, OVC detection timer and suspend/
+resume timer register.
+
+- reg: offset and length of the partial USB2.0 Host register block.
+- clocks: clock phandle and specifier pair for usb2.0 host.
+- clk-names: string, clock input name, must be "usb20_host".
+
 The USB PHY device tree node should have the subnodes corresponding to the USB
 channels. These subnodes must contain the following properties:
 - reg: the USB controller selector; see the table below for the values.
 - #phy-cells: see phy-bindings.txt in the same directory, must be <1>.
 
 The phandle's argument in the PHY specifier is the USB controller selector for
-the USB channel; see the selector meanings below:
+the USB channel other than r8a77470 SoC; see the selector meanings below:
 
 +-----------+---------------+---------------+
 |\ Selector |               |               |
@@ -40,22 +51,57 @@ the USB channel; see the selector meanings below:
 | 2         | PCI EHCI/OHCI | xHCI          |
 +-----------+---------------+---------------+
 
+For r8a77470 SoC see the selector meaning below:
+
++-----------+---------------+---------------+
+|\ Selector |               |               |
++ --------- +       0       |       1       |
+| Channel  \|               |               |
++-----------+---------------+---------------+
+| 0         | EHCI/OHCI     | HS-USB        |
++-----------+---------------+---------------+
+
 Example (Lager board):
 
-	usb-phy@e6590100 {
-		compatible = "renesas,usb-phy-r8a7790", "renesas,rcar-gen2-usb-phy";
+	usbphy: usb-phy@e6590100 {
+		compatible = "renesas,usb-phy-r8a7790",
+		             "renesas,rcar-gen2-usb-phy";
 		reg = <0 0xe6590100 0 0x100>;
 		#address-cells = <1>;
 		#size-cells = <0>;
-		clocks = <&mstp7_clks R8A7790_CLK_HSUSB>;
+		clocks = <&cpg CPG_MOD 704>;
 		clock-names = "usbhs";
+		power-domains = <&sysc R8A7790_PD_ALWAYS_ON>;
+		resets = <&cpg 704>;
+		status = "disabled";
 
-		usb-channel@0 {
-			reg = <0>;
-			#phy-cells = <1>;
+		usb0: usb-channel@0 {
+		        reg = <0>;
+		        #phy-cells = <1>;
+		};
+		usb2: usb-channel@2 {
+		        reg = <2>;
+		        #phy-cells = <1>;
 		};
-		usb-channel@2 {
-			reg = <2>;
+	};
+
+Example (iWave RZ/G1C SBC):
+
+	usbphy0: usb-phy0@e6590100 {
+		compatible = "renesas,usb-phy-r8a77470",
+			     "renesas,rcar-gen2-usb-phy";
+		reg = <0 0xe6590100 0 0x100>,
+		      <0 0xee080200 0 0x118>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		clocks = <&cpg CPG_MOD 704>, <&cpg CPG_MOD 703>;
+		clock-names = "usbhs", "usb20_host";
+		power-domains = <&sysc R8A77470_PD_ALWAYS_ON>;
+		resets = <&cpg 704>, <&cpg 703>;
+		status = "disabled";
+
+		usb0: usb-channel@0 {
+			reg = <0>;
 			#phy-cells = <1>;
 		};
 	};
-- 
2.7.4




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