xtensa: add support for KC705

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
WIP: xtensa: update FSF variant

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
WIP: xtensa: xtfpga: add CY7C67300 USB controller support

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
WIP: xtensa: add i2c host controller to xtfpga dts

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
USB: c67x00: move URB private data allocation from under spinlock

This fixes the following warning:

  BUG: sleeping function called from invalid context at mm/slub.c:940
  in_atomic(): 1, irqs_disabled(): 1, pid: 17, name: khubd
  CPU: 0 PID: 17 Comm: khubd Not tainted 3.12.0-00004-g938dd60-dirty #1

   __might_sleep+0xbe/0xc0
   kmem_cache_alloc_trace+0x36/0x170
   c67x00_urb_enqueue+0x5c/0x254
   usb_hcd_submit_urb+0x66e/0x724
   usb_submit_urb+0x2ac/0x308
   usb_start_wait_urb+0x2c/0xb8
   usb_control_msg+0x8c/0xa8
   hub_port_init+0x191/0x718
   hub_thread+0x804/0xe14
   kthread+0x72/0x78
   ret_from_kernel_thread+0x8/0xc

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Peter Korsgaard <peter@korsgaard.com>
USB: c67x00: add proper delays to HPI read/write

According to CY7C67300 specification HPI read and write cycle duration
Tcyc must be at least 6T long, where T is 1/48MHz, which is 125ns.
Without this delay fast host processor cannot write to chip registers.
Add proper ndelay to hpi_{read,write}_reg.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Peter Korsgaard <peter@korsgaard.com>