[PATCH v2 16/29] iommu/mediatek: Adjust device link when it is sub-common
From: Yong Wu <yong.wu@mediatek.com>
Date: 2021-08-13 06:55:53
Also in:
linux-devicetree, linux-iommu, linux-mediatek, lkml
Subsystem:
iommu subsystem, mediatek iommu driver, the rest · Maintainers:
Joerg Roedel, Will Deacon, Yong Wu, Linus Torvalds
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@mediatek.com> --- 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
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