[PATCH v2 1/6] fsl-mc: Remove MSI domain propagation to sub-devices

From: Marc Zyngier

Date: Tue Feb 24 2026 - 05:11:37 EST


Only the root device generates MSIs (it is the only one talking to
the ITS), so propagating the domain is pretty pointless. Remove it.

Reviewed-by: Ioana Ciornei <ioana.ciornei@xxxxxxx>
Tested-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> # LX2160ARDB, LS2088ARDB
Tested-by: Sascha Bischoff <sascha.bischoff@xxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
drivers/bus/fsl-mc/fsl-mc-bus.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index c117745cf2065..1a6c8e3c0b27f 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -854,14 +854,12 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc,
} else {
/*
* A non-DPRC object has to be a child of a DPRC, use the
- * parent's ICID and interrupt domain.
+ * parent's ICID.
*/
mc_dev->icid = parent_mc_dev->icid;
mc_dev->dma_mask = FSL_MC_DEFAULT_DMA_MASK;
mc_dev->dev.dma_mask = &mc_dev->dma_mask;
mc_dev->dev.coherent_dma_mask = mc_dev->dma_mask;
- dev_set_msi_domain(&mc_dev->dev,
- dev_get_msi_domain(&parent_mc_dev->dev));
}

/*
--
2.47.3