linux-kernel - Re: [PATCH V4 2/2] clk: imx: scu: add cpu frequency scaling support

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Message-ID: <155078210899.77512.5319038009555276321@swboyd.mtv.corp.google.com>
Date:   Thu, 21 Feb 2019 12:48:28 -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 V4 2/2] clk: imx: scu: add cpu frequency scaling support

Quoting Anson Huang (2019-02-13 17:54:08)
> 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>
> ---
> Changes since V3:
>         - use different clk ops for CPU clock to avoid runtime check in clk_set_rate;
>         - use rsrc_id to determine whether it is CPU frequency change and also to get
>           cluster ID for SMC call.

This directly conflicts with a patch to add get/set parent support from
Aisheng Dong. Can you please work together and rebase the patch on top
of that patch (which is in clk-next) and resend this?