Kalimera Pantelis,
I'm trying to use an overlay to enable an additional serial port on an
expansion port. The serial driver relies on of_alias_get_id() to find the
serial index, so I have to update /aliases.
My first naive try:
fragment@0 {
target-path = "/aliases";
__overlay__ {
serial3 = <&scif3>;
};
};
didn't work, as now /aliases/serial3 is a phandle, not a string.
Next try:
serial3 = &scif3;
That one isn't liked by dtc:
ERROR (path_references): Reference to non-existent node or label "scif3"
Am I correct in assuming that fixup_path_references() needs updating to
support this, cfr. fixup_phandle_references()?
Finally, let's hardcode the path:
serial3 = "/serial@e6ea8000";
Now /sys/firmware/devicetree/base/aliases/serial3 is correct, but it
still doesn't
work, as the list of aliases is created only once (by of_alias_scan_aliases()),
after unpacking the device tree. I guess of_alias_add() should be called when
adding a property to /aliases.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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