linux-kernel - [PATCH v6 4/6] iommu/arm-smmu: Add the device

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Message-Id: <1516362223-22946-5-git-send-email-vivek.gautam@codeaurora.org>
Date:   Fri, 19 Jan 2018 17:13:41 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     alex.williamson@...hat.com, robh+dt@...nel.org,
        mark.rutland@....com, rjw@...ysocki.net, robin.murphy@....com,
        will.deacon@....com, iommu@...ts.linux-foundation.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, sboyd@...eaurora.org
Cc:     gregkh@...uxfoundation.org, sricharan@...eaurora.org,
        m.szyprowski@...sung.com, architt@...eaurora.org,
        linux-arm-msm@...r.kernel.org, vivek.gautam@...eaurora.org
Subject: [PATCH v6 4/6] iommu/arm-smmu: Add the device_link between masters and smmu

From: Sricharan R <sricharan@...eaurora.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 <sricharan@...eaurora.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:
-- 
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