usb: phy: Improve Kconfig help for CONFIG_USB_PHY

The previous text confused users by not describing the very common
(e.g. x86 PC) sitations where no PHY driver is necessary.

Signed-off-by: George Spelvin <linux@horizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 7ef3eb8617a6..2311b1e4e43c 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -4,11 +4,17 @@
 menuconfig USB_PHY
         bool "USB Physical Layer drivers"
         help
-          USB controllers (those which are host, device or DRD) need a
-          device to handle the physical layer signalling, commonly called
-          a PHY.
+          Most USB controllers have the physical layer signalling part
+          (commonly called a PHY) built in.  However, dual-role devices
+          (a.k.a. USB on-the-go) which support being USB master or slave
+          with the same connector often use an external PHY.
 
-          The following drivers add support for such PHY devices.
+          The drivers in this submenu add support for such PHY devices.
+          They are not needed for standard master-only (or the vast
+          majority of slave-only) USB interfaces.
+
+          If you're not sure if this applies to you, it probably doesn't;
+          say N here.
 
 if USB_PHY