README: add documentation for CONFIG_USB_ULPI*

Add documentation for CONFIG_USB_ULPI and CONFIG_USB_ULPI_VIEWPORT configuration options. Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
13 years ago · d70a560fd7
parent cf9f95f293
commit d70a560fd7
1 changed files with 8 additions and 0 deletions
--- a/8
+++ b/8
@ -1185,6 +1185,14 @@ The following options need to be configured:
 			for your device
 			- CONFIG_USBD_PRODUCTID 0xFFFF

+- ULPI Layer Support:
+		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
+		the generic ULPI layer. The generic layer accesses the ULPI PHY
+		via the platform viewport, so you need both the genric layer and
+		the viewport enabled. Currently only Chipidea/ARC based
+		viewport is supported.
+		To enable the ULPI layer support, define CONFIG_USB_ULPI and
+		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.

 - MMC Support:
 		The MMC controller on the Intel PXA is supported. To