diff options
Diffstat (limited to 'drivers/iommu/mtk_iommu.c')
| -rw-r--r-- | drivers/iommu/mtk_iommu.c | 38 |
1 files changed, 24 insertions, 14 deletions
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index bb9dd92c9898..90685946fcbe 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -1140,22 +1140,32 @@ static int mtk_iommu_probe(struct platform_device *pdev) data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN); if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE)) { - switch (data->plat_data->m4u_plat) { - case M4U_MT2712: - p = "mediatek,mt2712-infracfg"; - break; - case M4U_MT8173: - p = "mediatek,mt8173-infracfg"; - break; - default: - p = NULL; + infracfg = syscon_regmap_lookup_by_phandle(dev->of_node, "mediatek,infracfg"); + if (IS_ERR(infracfg)) { + /* + * Legacy devicetrees will not specify a phandle to + * mediatek,infracfg: in that case, we use the older + * way to retrieve a syscon to infra. + * + * This is for retrocompatibility purposes only, hence + * no more compatibles shall be added to this. + */ + switch (data->plat_data->m4u_plat) { + case M4U_MT2712: + p = "mediatek,mt2712-infracfg"; + break; + case M4U_MT8173: + p = "mediatek,mt8173-infracfg"; + break; + default: + p = NULL; + } + + infracfg = syscon_regmap_lookup_by_compatible(p); + if (IS_ERR(infracfg)) + return PTR_ERR(infracfg); } - infracfg = syscon_regmap_lookup_by_compatible(p); - - if (IS_ERR(infracfg)) - return PTR_ERR(infracfg); - ret = regmap_read(infracfg, REG_INFRA_MISC, &val); if (ret) return ret; |