Its members currently include:. If the device is in a USB suspend state, remote wakeup is used and OTG peripherals don’t always need hosts to enable wakeup. For example, in USB these power management operations need to interact with other concurrent operations; locking in usbcore is an ongoing issue. The Linux-USB Host side “usbcore” module acquired a few new OTG-specific responsibilities affecting enumeration, which are mostly invisible to device drivers. At this writing, the Linux-OMAP implementation passes essentially all of these software compliance tests. Drivers intended for use with “targeted” peripherals should be modified to behave with USB suspend, which will trigger either HNP or power savings or both. Devices not on the whitelist trigger a diagnostic, and normally disable the device.

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One of those interfaces is1p301 OMAP-specific: Contents of this structure should be easy to define with the aid of board schematics and chip specifications, although there might be more than one HMC mode to choose from mapping USB ports to pin groups and controllers.

[11/22] usb: phy: isp Use of_device_match() – Patchwork

The other interface is relatively generic: Also, something should suspend devices that aren’t in active use. That way the new code paths can get better testing, rather than being used only for currently uncommon OTG devices.

One platform device will be created: Each product must define its own such list of “good” devices. Other boards might need to implement this differently. Since OTG products will normally be battery powered, and will need to aggressively leverage per-device suspend modes to extend battery life, this area needs much more work.


Programming Interface Updates It was a goal to keep these interface changes small, and to have them be useful outside of OTG support where possible.

Linux Kernel Driver DataBase: CONFIG_ISP_OMAP: Philips ISP with OMAP OTG

Most OMAP processors support this and similar product designs. Instead linuz being disabled, dual-role devices may be immediately switched to host role using HNP, in case this device is on the other’s whitelist. Three integrated USB controllers: Root hubs can specify their power budget, such as the minimum 8mA for the OTG root port. Most of the work in that area is addressing system suspend issues, although some APIs do support the per-device suspend ispp1301.

This UDC is quite full-featured, supporting numerous endpoints, DMA, and isochronous transfers; it can easily implement composite multi-function devices. If not, it’s easy to change at least the non-bootloader portionsand most of the changes should stay out of the controller drivers.

This document should be useful to developers investigating the use of Linux ilnux implement OTG-capable products. This means that the hub driver doesn’t have a fully accurate view of the power status of the OTG issp1301 it’s not yet controlled through root hub operations.

This driver is significantly more functional than the previous one on Linux 2. Devices not on the whitelist trigger a diagnostic, and normally disable the device.

[PATCH v4 3/3] USB: ohci-nxp: Use isp1301 driver

This information is not currently visible in sysfs. All USB gadget drivers that will be used on OTG-capable hardware should have corresponding changes; at this writing, some of the gadget drivers still haven’t been modified to know about OTG.

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USB Gadget Drivers have some new responsibilities that involve using those new interfaces. Eventually that shouldn’t be a problem, but lijux it often is one.

CONFIG_ISP1301_OMAP: Philips ISP1301 with OMAP OTG

The OTG controller could also change. These points are addressed in the rest of this document, in that same order. Also, so far there’s no gadgetfs support for OTG: Programming Interfaces have been updated; mainstream Linux 2. That meant only one role host or peripheral could be active, and also that lots of board-specific and chip-specific information was mixed into the controller drivers.

In A-role default hostthe H2 itself supplies 8mA. In addition, if HNP is ever enabled, it can’t be kinux without re-enumerating the device. That controls isp130 in A-Host or B-Peripheral role, and is the only method needed unless you’re hooking up to another dual-role device. Call this “cable based role switching”; some incomplete OTG implementations stop at this point.

OTG uses two methods to chose device role: When the device is a USB hub, any child devices are suspended as part of suspending the hub’s interface.