linux-kernel - Re: [PATCH V4 2/6] iommu/arm-smmu: Add pm

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Message-ID: <20170712225821.GB22780@codeaurora.org>
Date:   Wed, 12 Jul 2017 15:58:21 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
Cc:     joro@...tes.org, robin.murphy@....com, robh+dt@...nel.org,
        mark.rutland@....com, will.deacon@....com,
        m.szyprowski@...sung.com, robdclark@...il.com,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, sricharan@...eaurora.org,
        stanimir.varbanov@...aro.org, architt@...eaurora.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V4 2/6] iommu/arm-smmu: Add pm_runtime/sleep ops

On 07/06, Vivek Gautam wrote:
> From: Sricharan R <sricharan@...eaurora.org>
> 
> 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@...eaurora.org>
> Signed-off-by: Archit Taneja <architt@...eaurora.org>
> [vivek: Clock rework to loop over clock names data]
> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
> ---

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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