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From Stephen Warren: ARM: tegra: device tree changes A wide variety of device tree additions are made across many Tegra boards: * WiFi is supported on Seaboard, Ventana, and Cardhu. * An I2C mux is added for Ventana, and Tamonten. * SPI flash is added to Cardhu, and TrimSlice. * Temperature sensors are added to Harmony, Tamonten, and Ventana. * host1x (graphics/display controller) is added to the SoC include files. * HDMI displays are enabled on Harmony, TrimSlice, Tamonten, Plutux, Tec, and Whistler. This pull request is based on tegra-for-3.8-soc. * tag 'tegra-for-3.8-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-tegra: (47 commits) ARM: tegra: whistler: enable HDMI port ARM: tegra: tec: Enable HDMI output ARM: tegra: plutux: Enable HDMI output ARM: tegra: tamonten: Add host1x support ARM: tegra: trimslice: enable HDMI port ARM: tegra: harmony: enable HDMI port ARM: tegra: Add Tegra30 host1x support ARM: tegra: Add Tegra20 host1x support ARM: tegra: trimslice: enable SPI flash ARM: tegra: dts: add sflash controller dt entry ARM: tegra: ventana: Add NCT1008 temperature sensor ARM: tegra: tamonten: Add NCT1008 temperature sensor ARM: tegra: harmony: Add ADT7641 temperature sensor ARM: tegra: tec: Remove redundant DT properties ARM: tegra: tamonten: Add DDC/PTA pinmux ARM: tegra: dts: cardhu: enable SLINK4 ARM: tegra: dts: add slink controller dt entry ARM: dt: tegra: ventana: define pinmux for ddc ARM: dt: t30 cardhu: set pinmux and power for wlan ARM: dt: t20 ventana: set pinmux and power for wlan ...
To understand all the Linux-USB framework, you'll use these resources:
* This source code. This is necessarily an evolving work, and
includes kerneldoc that should help you get a current overview.
("make pdfdocs", and then look at "usb.pdf" for host side and
"gadget.pdf" for peripheral side.) Also, Documentation/usb has
more information.
* The USB 2.0 specification (from www.usb.org), with supplements
such as those for USB OTG and the various device classes.
The USB specification has a good overview chapter, and USB
peripherals conform to the widely known "Chapter 9".
* Chip specifications for USB controllers. Examples include
host controllers (on PCs, servers, and more); peripheral
controllers (in devices with Linux firmware, like printers or
cell phones); and hard-wired peripherals like Ethernet adapters.
* Specifications for other protocols implemented by USB peripheral
functions. Some are vendor-specific; others are vendor-neutral
but just standardized outside of the www.usb.org team.
Here is a list of what each subdirectory here is, and what is contained in
them.
core/ - This is for the core USB host code, including the
usbfs files and the hub class driver ("khubd").
host/ - This is for USB host controller drivers. This
includes UHCI, OHCI, EHCI, and others that might
be used with more specialized "embedded" systems.
gadget/ - This is for USB peripheral controller drivers and
the various gadget drivers which talk to them.
Individual USB driver directories. A new driver should be added to the
first subdirectory in the list below that it fits into.
image/ - This is for still image drivers, like scanners or
digital cameras.
../input/ - This is for any driver that uses the input subsystem,
like keyboard, mice, touchscreens, tablets, etc.
../media/ - This is for multimedia drivers, like video cameras,
radios, and any other drivers that talk to the v4l
subsystem.
../net/ - This is for network drivers.
serial/ - This is for USB to serial drivers.
storage/ - This is for USB mass-storage drivers.
class/ - This is for all USB device drivers that do not fit
into any of the above categories, and work for a range
of USB Class specified devices.
misc/ - This is for all USB device drivers that do not fit
into any of the above categories.