linux-kernel - Re: [TEGRA194_CPUFREQ Patch v3 3/4] cpufreq: Add Tegra194 cpufreq driver

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Message-ID: <20200623062020.weg6h4uygelkih7d@vireshk-i7>
Date:   Tue, 23 Jun 2020 11:50:20 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Sumit Gupta <sumitg@...dia.com>
Cc:     rjw@...ysocki.net, catalin.marinas@....com, will@...nel.org,
        thierry.reding@...il.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org, jonathanh@...dia.com, talho@...dia.com,
        linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bbasu@...dia.com, mperttunen@...dia.com
Subject: Re: [TEGRA194_CPUFREQ Patch v3 3/4] cpufreq: Add Tegra194 cpufreq
 driver

On 23-06-20, 10:49, Sumit Gupta wrote:
> Hi Viresh,
> 
> Thank you for the review. please find my reply inline.
> 
> 
> > > +++ b/drivers/cpufreq/tegra194-cpufreq.c
> > > @@ -0,0 +1,403 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved
> > 
> >                      2020

You missed this ?

> T194 supports four CPU clusters, each with two cores. Each CPU cluster is
> capable of running at a specific frequency sourced by respective NAFLL to
> provide cluster specific clocks. Individual cores within a cluster write
> freq in per core register. Cluster h/w forwards the max(core0, core1)
> request to per cluster NAFLL.

Okay, this is clear now. Add a comment about this max thing in the
target routine to show why you need to do this on all CPUs.

-- 
viresh