linux-kernel - Re: [PATCH V6 2/2] clk: imx: scu: add cpu frequency scaling support

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Message-ID: <155027761947.115909.17708921995062238540@swboyd.mtv.corp.google.com>
Date:   Fri, 15 Feb 2019 16:40:19 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "festevam@...il.com" <festevam@...il.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        Aisheng Dong <aisheng.dong@....com>,
        Anson Huang <anson.huang@....com>,
        Daniel Baluta <daniel.baluta@....com>
Cc:     dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH V6 2/2] clk: imx: scu: add cpu frequency scaling support

Quoting Anson Huang (2019-02-14 01:55:57)
> On NXP's i.MX SoCs with system controller inside, CPU frequency
> scaling can ONLY be done by system controller firmware, and it
> can ONLY be requested from secure mode, so Linux kernel has to
> call ARM SMC to trap to ARM-Trusted-Firmware to request system
> controller firmware to do CPU frequency scaling.
> 
> This patch adds i.MX system controller CPU frequency scaling support,
> it reuses cpufreq-dt driver and implement the CPU frequency scaling
> inside SCU clock driver.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---

Acked-by: Stephen Boyd <sboyd@...nel.org>