linux/drivers/usb
Linus Walleij 82363cf2ee usb: musb: ux500: don't propagate the OF node
There is a regression in the upcoming v3.16-rc1, that is caused
by a problem that has been around for a while but now finally
hangs the system. The bootcrawl looks like this:

pinctrl-nomadik soc:pinctrl: pin GPIO256_AF28 already
requested by a03e0000.usb_per5; cannot claim for musb-hdrc.0.auto
pinctrl-nomadik soc:pinctrl: pin-256 (musb-hdrc.0.auto) status -22
pinctrl-nomadik soc:pinctrl: could not request pin 256
(GPIO256_AF28) from group usb_a_1  on device pinctrl-nomadik
musb-hdrc musb-hdrc.0.auto: Error applying setting, reverse
things back
HS USB OTG: no transceiver configured
musb-hdrc musb-hdrc.0.auto: musb_init_controller failed
with status -517
platform musb-hdrc.0.auto: Driver musb-hdrc requests
probe deferral
(...)

The ux500 MUSB driver propagates the OF node to the dynamically
created musb-hdrc device, which is incorrect as it makes the OF
core believe there are two devices spun from the very same
DT node, which confuses other parts of the device core, notably
the pin control subsystem, which will try to apply all the pin
control settings also to the HDRC device as it gets
instantiated. (The OMAP2430 for example, does not set the
of_node member.)

Cc: <stable@vger.kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2014-06-19 10:06:47 -05:00
..
atm usb: delete non-required instances of include <linux/init.h> 2014-01-08 15:01:39 -08:00
c67x00 USB: c67x00: correct spelling mistakes in comments 2014-01-08 15:05:14 -08:00
chipidea usb: chipidea: udc: update gadget states according to ch9 2014-05-23 11:36:44 +09:00
class USB: usbtmc: fix DMA on stack 2014-05-27 16:03:57 -07:00
common usb: common: rename phy-fsm-usb.c to usb-otg-fsm.c 2014-05-27 15:29:44 -07:00
core Merge branch 'next' (accumulated 3.16 merge window patches) into master 2014-06-08 11:31:16 -07:00
dwc2 usb: dwc2: Add function to calculate correct FIFO sizes 2014-05-27 15:42:42 -07:00
dwc3 usb: dwc3: dwc3-omap: Disable/Enable only wrapper interrupts in prepare/complete 2014-06-19 10:06:45 -05:00
early
gadget usb: gadget: u_ether: synchronize with transmit when stopping queue 2014-06-19 10:06:46 -05:00
host Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-06-09 18:10:34 -07:00
image USB: image: correct spelling mistake in comment 2014-01-08 15:08:14 -08:00
misc usb: usbtest: add pattern check on pipe in phase of unlink read 2014-05-27 16:23:43 -07:00
mon
musb usb: musb: ux500: don't propagate the OF node 2014-06-19 10:06:47 -05:00
phy USB driver patches for 3.16-rc1 2014-06-03 09:11:20 -07:00
renesas_usbhs usb: renesas: gadget: fixup: complete STATUS stage after receiving 2014-06-19 10:06:46 -05:00
serial Merge branch 'next' (accumulated 3.16 merge window patches) into master 2014-06-08 11:31:16 -07:00
storage USB: storage: ene_ub6250: Use kmemdup instead of kmalloc + memcpy 2014-05-27 16:23:44 -07:00
wusbcore USB: wusbcore: fix control-pipe directions 2014-05-27 15:04:10 -07:00
Kconfig usb: host: remove USB_ARCH_HAS_?HCI 2014-02-18 12:36:38 -08:00
Makefile usb: move usb/usb-common.c to usb/common/usb-common.c 2014-05-27 15:29:44 -07:00
README
usb-skeleton.c usb: delete non-required instances of include <linux/init.h> 2014-01-08 15:01:39 -08:00

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.