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checks: Warn about missing #address-cells for interrupt parents

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The device tree specification (v0.4) suggests that #address-cells is
mandatory for interrupt parent nodes. If this property is missing, Linux
will default to the value of 0.

A number of device tree files rely on Linux' fallback and don't specify
an explicit #address-cells as suggested by the specification. This can
cause issues when these device trees are passed to software with a more
pedantic interpretation of the DT spec.

Add a warning when this case is detected so that device tree files can
be fixed.

Reported-by: Brad Griffis <bgriffis@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Message-ID: <20241213141438.3616902-1-thierry.reding@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Thierry Reding 2024-12-13 15:14:38 +01:00 • committed by David Gibson
parent 755db11535
commit 267efc7d46
1 changed files with 4 additions and 0 deletions
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4
checks.c
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@ -1676,6 +1676,10 @@ static void check_interrupt_map(struct check *c,
cellprop = get_property(provider_node, "#address-cells");
if (cellprop)
parent_cellsize += propval_cell(cellprop);
else
FAIL_PROP(c, dti, node, irq_map_prop,
"Missing property '#address-cells' in node %s, using 0 as fallback",
provider_node->fullpath);
cell += 1 + parent_cellsize;
if (cell > map_cells)