On Thu, May 30, 2024 at 01:50:48PM -0500, Rob Herring (Arm) wrote: > While OpenFirmware originally allowed default values of #address-cells > and #size-cells, FDT has long required explicit values. It's been a > warning in dtc for the root node since the beginning (2005) and for > any parent node since 2007. Of course, not all FDT uses dtc, but that > should be the majority by far. The various extracted OF devicetrees I > have dating back to the 1990s (various PowerMac, OLPC, PASemi Nemo) > all have explicit root node properties. > > I have no idea what exists for Sparc, so disabling the warning for it. > If any other platforms hit the warning, then the warning can be > disabled for them. > > Signed-off-by: Rob Herring (Arm) <robh@xxxxxxxxxx> > --- > Sparc folks, If anyone can dump DTs from some Sparc systems it would be > helpful. > --- > drivers/of/base.c | 2 ++ > drivers/of/fdt.c | 2 ++ > 2 files changed, 4 insertions(+) > > diff --git a/drivers/of/base.c b/drivers/of/base.c > index 61fff13bbee5..6930aa29fec1 100644 > --- a/drivers/of/base.c > +++ b/drivers/of/base.c > @@ -96,6 +96,7 @@ int of_bus_n_addr_cells(struct device_node *np) > return cells; > > /* No #address-cells property for the root node */ > + WARN_ONCE(!IS_ENABLED(CONFIG_SPARC), "Only listed platforms should rely on default '#address-cells'\n"); I assume "listed platforms" means things in the first parameter of WARN_ONCE()? Since that's only SPARC, why not just say it? The error message is rather obtuse as-is I think.
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