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The current selection of the reference MTIMER may fail in some setup. In a multi-cluster configuration, there is one MTIMER per cluster, each associated with the HARTS of the cluster. So we do not have a MTIMER with no associated HARTs to use as our reference. To be able to select a reference MTIMER in that case, look up an optional device tree property named "riscv,reference-mtimer" that indicate which MTIMER is the reference. Signed-off-by: Benoît Monin <benoit.monin@bootlin.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20251107-p8700-aclint-v3-1-93eabb17d54e@bootlin.com Signed-off-by: Anup Patel <anup@brainfault.org>