linux-kernel - [PATCH v3 2/3] Phy: DT binding documentation for Broadcom Cygnus USB PHY driver

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Message-ID: <1429744479-10410-3-git-send-email-arun.ramamurthy@broadcom.com>
Date:	Wed, 22 Apr 2015 16:14:38 -0700
From:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>
To:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	"Mark Rutland" <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Russell King" <linux@....linux.org.uk>,
	Kishon Vijay Abraham I <kishon@...com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Gabriel FERNANDEZ <gabriel.fernandez@...com>,
	Jason Cooper <jason@...edaemon.net>,
	"Thomas Petazzoni" <thomas.petazzoni@...e-electrons.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>
CC:	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-fbdev@...r.kernel.org>, Dmitry Torokhov <dtor@...gle.com>,
	"Anatol Pomazau" <anatol@...gle.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	<bcm-kernel-feedback-list@...adcom.com>,
	Arun Ramamurthy <arun.ramamurthy@...adcom.com>
Subject: [PATCH v3 2/3] Phy: DT binding documentation for Broadcom Cygnus USB PHY driver

Broadcom's Cygnus chip has a USB 2.0 host controller connected to
three separate phys. One of the phs (port 2) is also connectd to
a usb 2.0 device controller

Signed-off-by: Arun Ramamurthy <arun.ramamurthy@...adcom.com>
Reviewed-by: Ray Jui <rjui@...adcom.com>
Reviewed-by: Scott Branden <sbranden@...adcom.com>
---
 .../bindings/phy/brcm,cygnus-usb-phy.txt           | 69 ++++++++++++++++++++++
 include/dt-bindings/phy/phy.h                      |  2 +
 2 files changed, 71 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt

diff --git a/Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt b/Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt
new file mode 100644
index 0000000..ec62044
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt
@@ -0,0 +1,69 @@
+BROADCOM CYGNUS USB PHY
+
+Required Properties:
+	- compatible:  brcm,cygnus-usb-phy
+	- reg : usbphy_regs - Base address of phy registers
+			usb2h_idm_regs - Base address of host idm registers
+			usb2d_idm_regs - Base address of device idm registers
+	- phy-cells - must be 1 for each port declared. The node
+		      that uses the phy must provide either PHY_CONFIG_DEVICE for device
+		      or PHY_CONFIG_HOST for host
+
+NOTE: port 0 and port 1 are host only and port 2 can be configured for host or
+device.
+
+Example of phy :
+	usbphy0: usbphy@...301c000 {
+		compatible = "brcm,cygnus-usb-phy";
+		reg = <0x0301c000 0x2000>,
+		      <0x18115000 0x1000>,
+		      <0x18111000 0x1000>;
+		status = "okay";
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+		usbphy0_0: usbphy0@0 {
+			#phy-cells = <1>;
+			reg = <0>;
+			status = "okay";
+			phy-supply = <&vbus_p0>;
+		};
+
+		usbphy0_1: usbphy0@1 {
+			#phy-cells = <1>;
+			reg = <1>;
+			status = "okay";
+		};
+
+		usbphy0_2: usbphy0@2 {
+			#phy-cells = <1>;
+			reg = <2>;
+			status = "okay";
+			phy-supply = <&vbus_p2>;
+		};
+	};
+
+Example of node using the phy:
+
+	/* This nodes declares all three ports as host */
+
+	ehci0: usb@...8048000 {
+		compatible = "generic-ehci";
+		reg = <0x18048000 0x100>;
+		interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;
+		phys = <&usbphy0_0 PHY_CONFIG_HOST &usbphy0_1 PHY_CONFIG_HOST &usbphy0_2 PHY_CONFIG_HOST>;
+		status = "okay";
+	};
+
+	/*
+	 * This node declares port 2 phy
+	 * and configures it for device
+	 */
+
+	usbd_udc_dwc1: usbd_udc_dwc@...804c000 {
+		compatible = "iproc-udc";
+		reg = <0x1804c000 0x2000>;
+		interrupts = <GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>;
+		phys = <&usbphy0_2 PHY_CONFIG_DEVICE>;
+		phy-names = "usb";
+	};
diff --git a/include/dt-bindings/phy/phy.h b/include/dt-bindings/phy/phy.h
index 6c90193..3f6b1ac 100644
--- a/include/dt-bindings/phy/phy.h
+++ b/include/dt-bindings/phy/phy.h
@@ -15,5 +15,7 @@
 #define PHY_TYPE_PCIE		2
 #define PHY_TYPE_USB2		3
 #define PHY_TYPE_USB3		4
+#define PHY_CONFIG_HOST		1
+#define PHY_CONFIG_DEVICE	0
 
 #endif /* _DT_BINDINGS_PHY */
-- 
2.3.4

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