linux-kernel - Re: [PATCH v16 3/5] iommu/arm-smmu: Add the device

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Date:   Wed, 26 Sep 2018 16:44:17 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>, joro@...tes.org,
        robh+dt@...nel.org, 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,
        rjw@...ysocki.net, 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,
        architt@...eaurora.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v16 3/5] iommu/arm-smmu: Add the device_link between
 masters and smmu

On 30/08/18 15:45, Vivek Gautam wrote:
> 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.

Reviewed-by: Robin Murphy <robin.murphy@....com>

> Signed-off-by: Sricharan R <sricharan@...eaurora.org>
> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
> Reviewed-by: Tomasz Figa <tfiga@...omium.org>
> Tested-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>   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 1bf542010be7..166c8c6da24f 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:
>