From: Sricharan R <sricha...@codeaurora.org>

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 <sricha...@codeaurora.org>
---
 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

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