linux-kernel - Re: [PATCH v4 4/7] cpufreq: add driver for Raspberry Pi

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Date:   Thu, 13 Jun 2019 08:58:54 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     stefan.wahren@...e.com, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        mbrugger@...e.de, sboyd@...nel.org, eric@...olt.net,
        f.fainelli@...il.com, bcm-kernel-feedback-list@...adcom.com,
        ptesarik@...e.com, linux-rpi-kernel@...ts.infradead.org,
        ssuloev@...altech.com, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, mturquette@...libre.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/7] cpufreq: add driver for Raspberry Pi

On 12-06-19, 20:24, Nicolas Saenz Julienne wrote:
> Raspberry Pi's firmware offers and interface though which update it's
> performance requirements. It allows us to request for specific runtime
> frequencies, which the firmware might or might not respect, depending on
> the firmware configuration and thermals.
> 
> As the maximum and minimum frequencies are configurable in the firmware
> there is no way to know in advance their values. So the Raspberry Pi
> cpufreq driver queries them, builds an opp frequency table to then
> launch cpufreq-dt.
> 
> Also, as the firmware interface might be configured as a module, making
> the cpu clock unavailable during init, this implements a full fledged
> driver, as opposed to most drivers registering cpufreq-dt, which only
> make use of an init routine.
> 
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> Acked-by: Eric Anholt <eric@...olt.net>
> Reviewed-by: Stephen Boyd <sboyd@...nel.org>

Applied. Thanks.

-- 
viresh