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

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Date:   Fri, 22 Feb 2019 02:34:16 +0000
From:   Anson Huang <anson.huang@....com>
To:     Stephen Boyd <sboyd@...nel.org>,
        "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>,
        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

Hi, Stephen

Best Regards!
Anson Huang

> -----Original Message-----
> From: Stephen Boyd [mailto:sboyd@...nel.org]
> Sent: 2019年2月22日 4:48
> To: devicetree@...r.kernel.org; festevam@...il.com;
> kernel@...gutronix.de; linux-arm-kernel@...ts.infradead.org; linux-
> clk@...r.kernel.org; linux-kernel@...r.kernel.org; mark.rutland@....com;
> mturquette@...libre.com; robh+dt@...nel.org; s.hauer@...gutronix.de;
> shawnguo@...nel.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?

I have resent the patch set based on top of clk-next and tested the function.
Please apply this resent patch, https://patchwork.kernel.org/patch/10825085/

Thanks,
Anson.