linux-kernel - [PATCH v7 18/36] iommu/mediatek: Adjust device link when it is sub-common

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Date:   Tue, 3 May 2022 15:14:09 +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>
CC:     Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Tomasz Figa <tfiga@...omium.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>, <yong.wu@...iatek.com>,
        <youlin.pei@...iatek.com>, <anan.sun@...iatek.com>,
        <xueqi.zhang@...iatek.com>, <yen-chang.chen@...iatek.com>,
        "AngeloGioacchino Del Regno" 
        <angelogioacchino.delregno@...labora.com>,
        <mingyuan.ma@...iatek.com>, <yf.wang@...iatek.com>,
        <libo.kang@...iatek.com>, <chengci.xu@...iatek.com>
Subject: [PATCH v7 18/36] 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>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/iommu/mtk_iommu.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 7d4bc562b2a3..bcdc932cd473 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -834,7 +834,7 @@ static const struct component_master_ops mtk_iommu_com_ops = {
 static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **match,
 				  struct mtk_iommu_data *data)
 {
-	struct device_node *larbnode, *smicomm_node;
+	struct device_node *larbnode, *smicomm_node, *smi_subcomm_node;
 	struct platform_device *plarbdev;
 	struct device_link *link;
 	int i, larb_nr, ret;
@@ -874,11 +874,21 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
 					    component_compare_of, larbnode);
 	}
 
-	/* Get smi-common dev from the last larb. */
-	smicomm_node = of_parse_phandle(larbnode, "mediatek,smi", 0);
-	if (!smicomm_node)
+	/* Get smi-(sub)-common dev from the last larb. */
+	smi_subcomm_node = of_parse_phandle(larbnode, "mediatek,smi", 0);
+	if (!smi_subcomm_node)
 		return -EINVAL;
 
+	/*
+	 * It may have two level smi-common. the node is smi-sub-common if it
+	 * has a new mediatek,smi property. otherwise it is smi-commmon.
+	 */
+	smicomm_node = of_parse_phandle(smi_subcomm_node, "mediatek,smi", 0);
+	if (smicomm_node)
+		of_node_put(smi_subcomm_node);
+	else
+		smicomm_node = smi_subcomm_node;
+
 	plarbdev = of_find_device_by_node(smicomm_node);
 	of_node_put(smicomm_node);
 	data->smicomm_dev = &plarbdev->dev;
-- 
2.18.0