4257b72f |
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 | |