FireWire: add a Documentation driver-api chapter

Add a basic Firewire/IEEE 1394 driver API chapter to the Linux
kernel documentation.
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Cc: linux-doc@vger.kernel.org
Cc: linux-scsi@vger.kernel.org
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/driver-api/firewire.rst

+===========================================
+Firewire (IEEE 1394) driver Interface Guide
+===========================================
+
+Introduction and Overview
+=========================
+
+TBD
+
+Firewire char device data structures
+====================================
+
+.. kernel-doc:: include/uapi/linux/firewire-cdev.h
+    :internal:
+
+Firewire device probing and sysfs interfaces
+============================================
+
+.. kernel-doc:: drivers/firewire/core-device.c
+    :export:
+
+Firewire core transaction interfaces
+====================================
+
+.. kernel-doc:: drivers/firewire/core-transaction.c
+    :export:
+
+Firewire Isochronous I/O interfaces
+===================================
+
+.. kernel-doc:: drivers/firewire/core-iso.c
+   :export:
+

Documentation/driver-api/index.rst

@@ -29,6 +29,7 @@ available subsections can be seen below.
    iio/index
    input
    usb/index
+   firewire
    pci
    spi
    i2c