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| author | Heikki Krogerus <heikki.krogerus@linux.intel.com> | 2015-05-13 15:26:42 +0300 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2015-05-13 20:04:55 +0300 |
| commit | 289fcff4bcdb1dcc0ce8788b7ea0f58a9e4a495f (patch) | |
| tree | 7c5156a0a503fccc18a449de06edda6c07060160 /drivers/usb/core | |
| parent | 3521a399dae8d66fc784cef70a78e65ce73e364f (diff) | |
| download | linux-289fcff4bcdb1dcc0ce8788b7ea0f58a9e4a495f.tar.xz | |
usb: add bus type for USB ULPI
UTMI+ Low Pin Interface (ULPI) is a commonly used PHY
interface for USB 2.0. The ULPI specification describes a
standard set of registers which the vendors can extend for
their specific needs. ULPI PHYs provide often functions
such as charger detection and ADP sensing and probing.
There are two major issues that the bus type is meant to
tackle:
Firstly, ULPI registers are accessed from the controller.
The bus provides convenient method for the controller
drivers to share that access with the actual PHY drivers.
Secondly, there are already platforms that assume ULPI PHYs
are runtime detected, such as many Intel Baytrail based
platforms. They do not provide any kind of hardware
description for the ULPI PHYs like separate ACPI device
object that could be used to enumerate a device from.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: David Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/Kconfig | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig index cc0ced08bae2..a99c89e78126 100644 --- a/drivers/usb/core/Kconfig +++ b/drivers/usb/core/Kconfig @@ -84,3 +84,23 @@ config USB_OTG_FSM Implements OTG Finite State Machine as specified in On-The-Go and Embedded Host Supplement to the USB Revision 2.0 Specification. +config USB_ULPI_BUS + tristate "USB ULPI PHY interface support" + depends on USB_SUPPORT + help + UTMI+ Low Pin Interface (ULPI) is specification for a commonly used + USB 2.0 PHY interface. The ULPI specification defines a standard set + of registers that can be used to detect the vendor and product which + allows ULPI to be handled as a bus. This module is the driver for that + bus. + + The ULPI interfaces (the buses) are registered by the drivers for USB + controllers which support ULPI register access and have ULPI PHY + attached to them. The ULPI PHY drivers themselves are normal PHY + drivers. + + ULPI PHYs provide often functions such as ADP sensing/probing (OTG + protocol) and USB charger detection. + + To compile this driver as a module, choose M here: the module will + be called ulpi. |