From: Thierry Reding <treding@xxxxxxxxxx> 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@xxxxxxxxxx> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx> --- Applying this to Linux' copy reports on the order of 1300 issues that originate from 29 .dtsi files. If this proposal is acceptable/useful, I volunteer to patch those up so we don't get spammed by them. --- checks.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/checks.c b/checks.c index 9e6a7b6a3e97..123f2eb425f4 100644 --- a/checks.c +++ b/checks.c @@ -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) -- 2.47.0
