From mboxrd@z Thu Jan  1 00:00:00 1970
From: Saravana Kannan <saravanak@google.com>
Subject: Re: [PATCH v3 0/6] Introduce Bandwidth OPPs for interconnect paths
Date: Wed, 3 Jul 2019 13:35:44 -0700
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References: <20190703011020.151615-1-saravanak@google.com> <20190703063632.hl2lipcoeehplyxq@vireshk-i7>
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To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Georgi Djakov <georgi.djakov@linaro.org>, Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>, Stephen Boyd <sboyd@kernel.org>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Vincent Guittot <vincent.guittot@linaro.org>, seansw@qti.qualcomm.com, daidavid1@codeaurora.org, Rajendra Nayak <rnayak@codeaurora.org>, sibis@codeaurora.org, Bjorn Andersson <bjorn.andersson@linaro.org>, evgreen@chromium.org, Android Kernel Team <kernel-team@android.com>, Linux PM <linux-pm@vger.kernel.org>, devicetree@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
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On Tue, Jul 2, 2019 at 11:36 PM Viresh Kumar <viresh.kumar@linaro.org> wrote:
>
> On 02-07-19, 18:10, Saravana Kannan wrote:
> > Interconnects and interconnect paths quantify their performance levels in
> > terms of bandwidth and not in terms of frequency. So similar to how we have
> > frequency based OPP tables in DT and in the OPP framework, we need
> > bandwidth OPP table support in the OPP framework and in DT. Since there can
> > be more than one interconnect path used by a device, we also need a way to
> > assign a bandwidth OPP table to an interconnect path.
> >
> > This patch series:
> > - Adds opp-peak-KBps and opp-avg-KBps properties to OPP DT bindings
> > - Adds interconnect-opp-table property to interconnect DT bindings
> > - Adds OPP helper functions for bandwidth OPP tables
> > - Adds icc_get_opp_table() to get the OPP table for an interconnect path
> >
> > So with the DT bindings added in this patch series, the DT for a GPU
> > that does bandwidth voting from GPU to Cache and GPU to DDR would look
> > something like this:
>
> And what changed since V2 ?

Sorry, forgot to put that in. I just dropped a lot of patches that
weren't relevant to the idea of BW OPPs and tying them to
interconnects.

-Saravana