linux-kernel - [PATCH v2 16/29] iommu/mediatek: Adjust device link when it is sub-common

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Date:   Fri, 13 Aug 2021 14:53:11 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        Tomasz Figa <tfiga@...omium.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <yong.wu@...iatek.com>,
        <youlin.pei@...iatek.com>, Nicolas Boichat <drinkcat@...omium.org>,
        <anan.sun@...iatek.com>, <chao.hao@...iatek.com>
Subject: [PATCH v2 16/29] iommu/mediatek: Adjust device link when it is sub-common

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@...iatek.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