linux-kernel - Re: [PATCH 2/3] cpufreq: sama7g5: add cpufreq driver

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Message-ID: <20210105104426.4tmgc2l3vyicwedd@vireshk-i7>
Date:   Tue, 5 Jan 2021 16:14:26 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     rjw@...ysocki.net, robh+dt@...nel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] cpufreq: sama7g5: add cpufreq driver

On 05-01-21, 12:22, Claudiu Beznea wrote:
> Microchip SAMA7G5 devices supports runtime changes of CPU frequency.
> This is doable by changing CPUPLL frequency along with MCK0 frequency.
> Along with this CPU's regulator must be changed to accommodate new
> frequencies.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> ---
>  drivers/cpufreq/Kconfig.arm          |   9 +
>  drivers/cpufreq/Makefile             |   1 +
>  drivers/cpufreq/cpufreq-dt-platdev.c |   2 +
>  drivers/cpufreq/sama7g5-cpufreq.c    | 371 +++++++++++++++++++++++++++++++++++
>  4 files changed, 383 insertions(+)
>  create mode 100644 drivers/cpufreq/sama7g5-cpufreq.c

Did you try to reuse cpufreq-dt driver? It already handles most of
this stuff, the only thing you need to do is to make sure
clk_set_rate() for a CPU needs to handle all the clk stuff behind the
scene.

We haven't been accepting new implementations of the drivers which can
work just fine with cpufreq-dt, please try to adapt to it.

Thanks.

-- 
viresh