mvebu: usb: xhci: Add VBUS regulator supply to the host driver

The USB device should linked to VBUS regulator through "vbus-supply"
DTS property.
This patch adds handling for "vbus-supply" property inside the USB
device entry for turning on the VBUS regulator upon the host adapter probe.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Nadav Haklai <nadavh@marvell.com>
Cc: Neta Zur Hershkovits <neta@marvell.com>
Cc: Igal Liberman <igall@marvell.com>
Cc: Haim Boot <hayim@marvell.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>

1 files changed, 28 insertions, 0 deletions

diff --git a/doc/device-tree-bindings/usb/marvell.xhci-usb.txt b/doc/device-tree-bindings/usb/marvell.xhci-usb.txt
new file mode 100644
index 0000000..e042d1b
--- /dev/null
+++ b/doc/device-tree-bindings/usb/marvell.xhci-usb.txt
@@ -0,0 +1,28 @@
+Marvell SOC USB controllers
+
+This controller is integrated in Armada 3700/8K.
+It uses the same properties as a generic XHCI host controller
+
+Required properties :
+ - compatible: should be one or more of:
+   - "marvell,armada3700-xhci", "generic-xhci" for Armada 37xx SoCs
+   - "marvell,armada-8k-xhci", "generic-xhci" for Armada A8K SoCs
+ - reg: should contain address and length of the standard XHCI
+   register set for the device.
+ - interrupts: one XHCI interrupt should be described here.
+
+Optional properties:
+ - clocks: phandle to system controller clock driving this unit
+ - vbus-supply : If present, specifies the fixed regulator to be turned on
+   for providing power to the USB VBUS rail.
+
+Example:
+	cpm_usb3_0: usb3@500000 {
+		compatible = "marvell,armada-8k-xhci",
+			     "generic-xhci";
+		reg = <0x500000 0x4000>;
+		interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cpm_syscon0 1 22>;
+		vbus-supply = <&reg_usb3h0_vbus>;
+		status = "disabled";
+	};