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authorRafał Miłecki <rafal@milecki.pl>2016-08-12 00:28:03 +0200
committerKishon Vijay Abraham I <kishon@ti.com>2016-09-10 16:48:28 +0530
commite5666281d9eadb98a802e5ec6e85f0b4640f30c4 (patch)
tree1a2cd3465dc17529d4f8819663009f4ec8f4a184 /Documentation
parentb3e0d141ca9f7355fca8a12feb451c31f6b2ee18 (diff)
phy: bcm-ns-usb3: new driver for USB 3.0 PHY on Northstar
Northstar is a family of SoCs used in home routers. They have USB 2.0 and 3.0 controllers with PHYs that need to be properly initialized. This driver provides PHY init support in a generic way and can be bound with XHCI controller driver. There aren't any public datasheets from Broadcom so we can't have nice defines for all used bits. It means we just follow Broadcom's initialization procedure using their magic values. We were quite lucky actually that Broadcom put some comments in their SDK reference code explaining what given writes are responsible for. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.txt23
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diff --git a/Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.txt b/Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.txt
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+Driver for Broadcom Northstar USB 3.0 PHY
+
+Required properties:
+
+- compatible: one of: "brcm,ns-ax-usb3-phy", "brcm,ns-bx-usb3-phy".
+- reg: register mappings for DMP (Device Management Plugin) and ChipCommon B
+ MMI.
+- reg-names: "dmp" and "ccb-mii"
+
+Initialization of USB 3.0 PHY depends on Northstar version. There are currently
+three known series: Ax, Bx and Cx.
+Known A0: BCM4707 rev 0
+Known B0: BCM4707 rev 4, BCM53573 rev 2
+Known B1: BCM4707 rev 6
+Known C0: BCM47094 rev 0
+
+Example:
+ usb3-phy {
+ compatible = "brcm,ns-ax-usb3-phy";
+ reg = <0x18105000 0x1000>, <0x18003000 0x1000>;
+ reg-names = "dmp", "ccb-mii";
+ #phy-cells = <0>;
+ };