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Tue, 24 Aug 2021 00:35:31 -0700 (PDT) MIME-Version: 1.0 References: <20210813065324.29220-1-yong.wu@mediatek.com> <20210813065324.29220-17-yong.wu@mediatek.com> In-Reply-To: <20210813065324.29220-17-yong.wu@mediatek.com> From: Hsin-Yi Wang Date: Tue, 24 Aug 2021 15:35:05 +0800 Message-ID: Subject: Re: [PATCH v2 16/29] iommu/mediatek: Adjust device link when it is sub-common To: Yong Wu Cc: Joerg Roedel , Rob Herring , Matthias Brugger , Will Deacon , Robin Murphy , Krzysztof Kozlowski , Evan Green , Tomasz Figa , Tomasz Figa , "moderated list:ARM/Mediatek SoC support" , srv_heupstream@mediatek.com, Devicetree List , lkml , "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" , iommu@lists.linux-foundation.org, youlin.pei@mediatek.com, Nicolas Boichat , anan.sun@mediatek.com, chao.hao@mediatek.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210824_003542_901705_258578AC X-CRM114-Status: GOOD ( 23.22 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Fri, Aug 13, 2021 at 3:03 PM Yong Wu wrote: > > 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 > --- > 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); This only checks 1 level here, and does not check if the mediatek,smi of a sub-common node is not another sub-common node. So maybe add a check that the updated node here doesn't have mediatek,smi_sub_common property. > + 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 > _______________________________________________ > Linux-mediatek mailing list > Linux-mediatek@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-mediatek _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek