From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vivek Gautam Subject: [PATCH v5 4/6] iommu/arm-smmu: Add the device_link between masters and smmu Date: Tue, 9 Jan 2018 15:31:47 +0530 Message-ID: <1515492109-753-5-git-send-email-vivek.gautam@codeaurora.org> References: <1515492109-753-1-git-send-email-vivek.gautam@codeaurora.org> Return-path: In-Reply-To: <1515492109-753-1-git-send-email-vivek.gautam@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org To: joro@8bytes.org, robh+dt@kernel.org, mark.rutland@arm.com, rjw@rjwysocki.net, gregkh@linuxfoundation.org, robdclark@gmail.com, will.deacon@arm.com, robin.murphy@arm.com, sboyd@codeaurora.org, iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org Cc: len.brown@intel.com, pavel@ucw.cz, airlied@linux.ie, sricharan@codeaurora.org, m.szyprowski@samsung.com, architt@codeaurora.org, linux-arm-msm@vger.kernel.org List-Id: devicetree@vger.kernel.org From: Sricharan R Finally add the device link between the master device and smmu, so that the smmu gets runtime enabled/disabled only when the master needs it. This is done from add_device callback which gets called once when the master is added to the smmu. Signed-off-by: Sricharan R --- drivers/iommu/arm-smmu.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 95478bfb182c..33bbcfedb896 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1367,6 +1367,7 @@ static int arm_smmu_add_device(struct device *dev) struct arm_smmu_device *smmu; struct arm_smmu_master_cfg *cfg; struct iommu_fwspec *fwspec = dev->iommu_fwspec; + struct device_link *link; int i, ret; if (using_legacy_binding) { @@ -1428,6 +1429,16 @@ static int arm_smmu_add_device(struct device *dev) pm_runtime_put_sync(smmu->dev); + /* + * Establish the link between smmu and master, so that the + * smmu gets runtime enabled/disabled as per the master's + * needs. + */ + link = device_link_add(dev, smmu->dev, DL_FLAG_PM_RUNTIME); + if (!link) + dev_warn(smmu->dev, "Unable to create device link between %s and %s\n", + dev_name(smmu->dev), dev_name(dev)); + return 0; out_cfg_free: -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation