For MM IOMMU, We always add device link between smi-common and IOMMU HW.
In mt8195, we add smi-sub-common. Thus, if the node is sub-common, we still
need find again to get smi-common, then do device link.
Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx>
---
drivers/iommu/mtk_iommu.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index a4479916ad33..a72241724adb 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -845,6 +845,17 @@ static int mtk_iommu_mm_dts_parse(struct device *dev,
if (!smicomm_node)
return -EINVAL;
+ /* Find smi-common again if this is smi-sub-common */
+ if (of_property_read_bool(smicomm_node, "mediatek,smi_sub_common")) {
+ of_node_put(smicomm_node); /* put the sub common */
+
+ smicomm_node = of_parse_phandle(smicomm_node, "mediatek,smi", 0);
+ if (!smicomm_node) {
+ dev_err(dev, "sub-comm has no common.\n");
+ return -EINVAL;
+ }
+ }
+
plarbdev = of_find_device_by_node(smicomm_node);
of_node_put(smicomm_node);
data->smicomm_dev = &plarbdev->dev;
--
2.18.0
