X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=doc%2FREADME.fsl-hwconfig;h=e752505da49a14c58d873642047153053cf41bc5;hb=e551ee2deac2f63bc5f84ea0dc3ad3a3b74a107f;hp=03fea74db325f656dfc21301780d0f9f5f5f3487;hpb=e67f46286440a53fb1d693152667ea3b1a6b3060;p=oweals%2Fu-boot.git

diff --git a/doc/README.fsl-hwconfig b/doc/README.fsl-hwconfig
index 03fea74db3..e752505da4 100644
--- a/doc/README.fsl-hwconfig
+++ b/doc/README.fsl-hwconfig
@@ -19,3 +19,28 @@ audclk
 
 	'audclk:12'
 		Select the 12.288MHz clock
+
+usb
+	Specific to boards have USB controller
+
+	This option specifies the following for a USB controller:
+
+		- which controller mode to use
+		- which USB PHY to use
+
+	This is used by generic USB device-tree fixup function to update
+	modified values of phy type and controller mode.
+
+	Also used for configuring multiple USB controllers such that
+	'usbN' (where N is 1, 2, etc. refers to controller no.)
+
+	'phy_type'
+		Select USB phy type: 'utmi' OR 'ulpi'
+
+	'dr_mode'
+		Select USB controller mode: 'host', 'peripheral' OR 'otg'
+
+	Examples:
+		usb1:dr_mode=host;usb2:dr_mode=peripheral'
+
+		usb1:dr_mode=host,phy_type=utmi;usb2:dr_mode=host'