[PATCH 2/2] iommu/arm-smmu: Add system PM support

[will.deacon@arm.com (Will Deacon)]

On Tue, Jul 18, 2017 at 01:44:42PM +0100, Robin Murphy wrote:
> With all our hardware state tracked in such a way that we can naturally
> restore it as part of the necessary reset, resuming is trivial, and
> there's nothing to do on suspend at all.
> 
> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
> ---
>  drivers/iommu/arm-smmu.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 86897b7b81d8..0f5f06e9abfa 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -2356,10 +2356,22 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
> +{

Did you actually get a warning here without the __maybe_unused annotation?
It looks like some other drivers just guard the thing with CONFIG_PM_SLEEP.

> +	struct arm_smmu_device *smmu = dev_get_drvdata(dev);
> +
> +	arm_smmu_device_reset(smmu);
> +	return 0;
> +}
> +
> +
> +static SIMPLE_DEV_PM_OPS(arm_smmu_pm_ops, NULL, arm_smmu_pm_resume);
> +
>  static struct platform_driver arm_smmu_driver = {
>  	.driver	= {
>  		.name		= "arm-smmu",
>  		.of_match_table	= of_match_ptr(arm_smmu_of_match),
> +		.pm = &arm_smmu_pm_ops,

Cosmetic: can you tab-align this assignment please?

Will