USB: gadget: DFU: register as USB function ...

Register DFU as usb_function_instance to make it work with composite
gadgets. Also use this internally for registering as DFU device (with
the 'dfu' command).

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add function to parse a string in dfu format ...

The dfu command parses a string which contains a list of
devices and flags. This format is useful for other users
aswell, so add common helper functions to parse it and
let the dfu command use this format.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

USB: gadget: DFU: Move locally used defines/structs to dfu driver ...

There's no reason to have them under include/

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

USB: gadget: specify vendor/product id with device parameters ...

This introduces the device parameters:

usbgadget.product
usbgadget.vendor
usbgadget.manufacturer
usbgadget.productname

These variables are used to configure the USB vendor id, product id,
manufacturer name and product name.

Previously these were configured with arguments to the usbserial
and dfu command. The parameters are device static, so it's nice to
configure it somewhere in the environment instead of when calling
dfu/usbserial. Also when other gadget drivers are added we do not
have to duplicate the option parsing further.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: dfu: Add create flag ...

With the create flag DFU can upload to regular, previously non existing
files.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: dfu: Fix spelling of flag name ...

DFU_FLAG_SAVE should really be named DFU_FLAG_SAFE.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

remove remaining references of CONFIG_BOARDINFO ...

With this all code uses barebox_get_model() and no longer
a compile time generated string.

Also this renames barebox_boardinfo() to barebox_get_model()
since we are going to add the corresponding _set_ function
and 'model' corresponds to the devicetree notion.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Treewide: remove address of the Free Software Foundation ...

The FSF address has changed in the past. Instead of updating it
each time the address changes, just drop it completely treewide.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add USB device support ...

This patch adds support for USB devices. It uses
the Linux Kernel gadget API. Along with this patch
comes driver support for the Freescale (arc) USB OTG
Core and USB Device Firmware Update (DFU)
The serial gadget support is not working at the moment.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>