From mboxrd@z Thu Jan 1 00:00:00 1970 From: sricharan@codeaurora.org (Sricharan R) Date: Thu, 9 Mar 2017 21:05:48 +0530 Subject: [PATCH V3 5/5] iommu/arm-smmu: Add the device_link between masters and smmu In-Reply-To: <1489073748-3659-1-git-send-email-sricharan@codeaurora.org> References: <1489073748-3659-1-git-send-email-sricharan@codeaurora.org> Message-ID: <1489073748-3659-6-git-send-email-sricharan@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.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 --- 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 6370421..b06f86c7 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1671,6 +1671,7 @@ 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; unsigned long err; @@ -1727,6 +1728,16 @@ static int arm_smmu_add_device(struct device *dev) if (IS_ERR_VALUE(err)) goto out_free; + /* + * 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_free: -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation