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With 51 non-merge commits, this is one of the smallest USB Gadget pull requests. Apart from your expected set of non-critical fixes, and other miscellaneous items, we have most of the changes in dwc3 (52.5%) with all other UDCs following with 34.8%. As for the actual changes, the most important of them are all the recent changes to reduce memory footprint of dwc3, bare minimum dual-role support on dwc3 and reworked endpoint count and initialization routines. -----BEGIN PGP SIGNATURE----- iQJRBAABCAA7FiEElLzh7wn96CXwjh2IzL64meEamQYFAljsjRwdHGZlbGlwZS5i YWxiaUBsaW51eC5pbnRlbC5jb20ACgkQzL64meEamQaPZA/9H6GgNlvdGWPweJ0r g86iBmio/Qn334SOCAJDrdw4ULSTSQR8nQHGWuETE2pQ2uYA/dbBWvjkx8Pujs+u Ye2ig/iYchvHhY7cIWBG6A/iwvBClZF+yTv4ruh3i99BOGeAtGSyFS3HftQZLkGs 360CritNs+fSJsU6jnCE2+808evbkRiMaEfiBpiqXF2wvjMonWUMUlHaTBTHzDnk k2/NJSzDINr4HaALalJxVpEetC500LDkQ531O5s7V6NIareCIBOh2li9xZJur38h 728BbCIiwPrdfLI2gGJLUOJq5vf5fJPT6DMJDN4hsu7gXcl2GiIc3nqlcxBB8P9R kurWgjVd8aIGS7qqZzfDBH7I5UgFbJZbtVXy6UhSRILF+hzAb/l95pZUOyTwUnbj ew3ALD2H7XolJT9jLG/q1CaQQMjudVnhLF2s1Ota8dsBeOShH6yfS6hGGQ8L1j8x kXe3dl4HEj9s7gT0S+tVN+kt6bLGZ013CjCbuZgG9JLRkswyn780KTgL4pbjHiAE KNGlCGUPRh3AiDLSbQ4IRU/J/0MVFs51k8aPn6PWpUqU8nc1QNEfczqrlAGPvkqU nE77OktC1UCTrId7F8kllTEglOrR4CVXuT2N7rYzwgM2jmfHLzb0DaJ+a/ZdsUfI DjuY8jNbuGnvZRRiVQU5ynva5BU= =wYOI -----END PGP SIGNATURE----- Merge tag 'usb-for-v4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next Felipe writes: usb: changes for v4.12 With 51 non-merge commits, this is one of the smallest USB Gadget pull requests. Apart from your expected set of non-critical fixes, and other miscellaneous items, we have most of the changes in dwc3 (52.5%) with all other UDCs following with 34.8%. As for the actual changes, the most important of them are all the recent changes to reduce memory footprint of dwc3, bare minimum dual-role support on dwc3 and reworked endpoint count and initialization routines.
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 ("hub_wq").
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.