Re: [PATCH V4 2/6] iommu/arm-smmu: Add pm_runtime/sleep ops
From: Stephen Boyd
Date: Wed Jul 12 2017 - 18:58:34 EST
On 07/06, Vivek Gautam wrote:
> From: Sricharan R <sricharan@xxxxxxxxxxxxxx>
> The smmu needs to be functional only when the respective
> master's using it are active. The device_link feature
> helps to track such functional dependencies, so that the
> iommu gets powered when the master device enables itself
> using pm_runtime. So by adapting the smmu driver for
> runtime pm, above said dependency can be addressed.
> This patch adds the pm runtime/sleep callbacks to the
> driver and also the functions to parse the smmu clocks
> from DT and enable them in resume/suspend.
> Signed-off-by: Sricharan R <sricharan@xxxxxxxxxxxxxx>
> Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
> [vivek: Clock rework to loop over clock names data]
> Signed-off-by: Vivek Gautam <vivek.gautam@xxxxxxxxxxxxxx>
General comment, we have a bulk clk API now, but I guess we
failed to add the clk_bulk_prepare_enable() API that could be
used here. Perhaps you can add that API and then use it here to
reduce lines of code.
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