misc/patches/simplebus-nodeattach.patch

   1 Currently, we do not have a way to iterate over child FDT nodes, which
   2 is a problem when you have a devices like the USB system on the am335x
   3 (Beaglebone Black):
   4
   5 https://uglyman.kremlin.cc/gitweb/gitweb.cgi?p=bbb-usb.git;a=blob;f=misc/fdt/am335x-boneblack.dts;h=8799dc1d171961d3cd9a941131a82a15bbe445d7;hb=HEAD#l1489
   6
   7 This patch externalizes simplebus_attach_node which probes for drivers
   8 to attach to individual nodes, allowing drivers matching parent nodes to
   9 iterate over their children and call this function on each child. It
  10 works.
  11
  12 For a driver matching parent node property compatible="ti,am33xx-usb"
  13 and another driver matching child node property
  14 compatible="ti,musb-am33xx", we do the following in the parent node
  15 driver's _attach:
  16
  17 155: for (node = OF_child(faa->fa_node); node > 0; node = OF_peer(node))
  18 156:     simplebus_attach_node(parent, node);
  19
  20 and get:
  21
  22         amusbss0 at simplebus0: rev 0.13
  23         ammusb0 at simplebus0: rev 0.0
  24         ammusb1 at simplebus0: rev 0.0
  25         panic: welcome to openbsd
  26
  27 This is needed for a USB OTG driver for the am335x in the works.
  28
  29 Ian
  30
  31 Index: simplebusvar.h
  32 ===================================================================
  33 RCS file: /cvs/src/sys/arch/arm/simplebus/simplebusvar.h,v
  34 retrieving revision 1.1
  35 diff -u -p -r1.1 simplebusvar.h
  36 --- simplebusvar.h      21 Oct 2016 20:09:49 -0000      1.1
  37 +++ simplebusvar.h      12 Feb 2017 01:27:21 -0000
  38 @@ -31,3 +31,4 @@ struct simplebus_softc {
  39  };
  40
  41  extern void simplebus_attach(struct device *, struct device *, void *);
  42 +extern void simplebus_attach_node(struct device *, int);
  43
  44