linux-kernel - [PATCH v13 3/4] iommu/arm-smmu: Add the device

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Message-Id: <20180719101539.6104-4-vivek.gautam@codeaurora.org>
Date:   Thu, 19 Jul 2018 15:45:38 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     joro@...tes.org, robh+dt@...nel.org, rjw@...ysocki.net,
        robin.murphy@....com, will.deacon@....com,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     alex.williamson@...hat.com, mark.rutland@....com,
        robdclark@...il.com, linux-pm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, sboyd@...nel.org,
        tfiga@...omium.org, jcrouse@...eaurora.org,
        sricharan@...eaurora.org, m.szyprowski@...sung.com,
        lukas@...ner.de, architt@...eaurora.org,
        linux-arm-msm@...r.kernel.org,
        Vivek Gautam <vivek.gautam@...eaurora.org>
Subject: [PATCH v13 3/4] 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>
Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
Reviewed-by: Tomasz Figa <tfiga@...omium.org>
---

Changes since v12:
 - device_link_add() doesn't depend on pm_runtime_enabled() now.
 - Treat failure in device link addition as non-fatal.

 drivers/iommu/arm-smmu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 15b20941441a..25ff3bdbf7a3 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1461,6 +1461,9 @@ static int arm_smmu_add_device(struct device *dev)
 
 	iommu_device_link(&smmu->iommu, dev);
 
+	device_link_add(dev, smmu->dev,
+			DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER);
+
 	return 0;
 
 out_cfg_free:
-- 
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