[PATCH V4 4/6] iommu/arm-smmu: Add the device_link between masters and smmu
From: Vivek Gautam <hidden>
Date: 2017-07-06 09:37:53
Also in:
linux-arm-msm, linux-clk, linux-devicetree, linux-iommu, lkml
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
From: Sricharan R <redacted> 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 <redacted> --- 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 ddbfa8ab69e6..75567d9698ab 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c@@ -1348,6 +1348,7 @@ 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 = NULL; int i, ret; if (using_legacy_binding) {
@@ -1403,6 +1404,16 @@ 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:
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