linux-kernel - Re: [PATCH v6 08/52] dt-bindings: memory: tegra20: emc: Document mfd-simple compatible and statistics sub-device

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Message-ID: <20201027132241.GG1822510@ulmo>
Date:   Tue, 27 Oct 2020 14:22:41 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Mikko Perttunen <cyndis@...si.fi>,
        Viresh Kumar <vireshk@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v6 08/52] dt-bindings: memory: tegra20: emc: Document
 mfd-simple compatible and statistics sub-device

On Mon, Oct 26, 2020 at 01:16:51AM +0300, Dmitry Osipenko wrote:
> External Memory Controller can gather various hardware statistics that
> are intended to be used for debugging purposes and for dynamic frequency
> scaling of memory bus.
> 
> Document the new mfd-simple compatible and EMC statistics sub-device.
> The subdev contains EMC DFS OPP table and interconnect paths to be used
> for dynamic scaling of system's memory bandwidth based on EMC utilization
> statistics.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  .../memory-controllers/nvidia,tegra20-emc.txt | 43 +++++++++++++++++--
>  1 file changed, 40 insertions(+), 3 deletions(-)

Why does this have to be modelled as a separate device? Isn't this just
using a couple of registers out of the EMC register range? If so, this
would better just be integrated into the parent node and implemented as
part of the EMC driver. No need to further complicate things by adding
a dummy child.

Thierry

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