From: Anson Huang <anson.huang@nxp.com>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: "robh+dt@kernel.org" <robh+dt@kernel.org>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
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Aisheng Dong <aisheng.dong@nxp.com>,
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dl-linux-imx <linux-imx@nxp.com>
Subject: RE: [PATCH 3/3] cpufreq: imx-sc: add i.mx system controller cpufreq support
Date: Wed, 13 Feb 2019 10:35:32 +0000 [thread overview]
Message-ID: <DB3PR0402MB39161A96602CBF6D38514164F5660@DB3PR0402MB3916.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <20190213101502.v75d3nfwctcks2gx@vireshk-i7>
Best Regards!
Anson Huang
> -----Original Message-----
> From: Viresh Kumar [mailto:viresh.kumar@linaro.org]
> Sent: 2019年2月13日 18:15
> To: Anson Huang <anson.huang@nxp.com>
> Cc: robh+dt@kernel.org; mark.rutland@arm.com; shawnguo@kernel.org;
> s.hauer@pengutronix.de; kernel@pengutronix.de; festevam@gmail.com;
> catalin.marinas@arm.com; will.deacon@arm.com; rjw@rjwysocki.net;
> Aisheng Dong <aisheng.dong@nxp.com>; Daniel Baluta
> <daniel.baluta@nxp.com>; Andy Gross <andy.gross@linaro.org>;
> horms+renesas@verge.net.au; heiko@sntech.de; arnd@arndb.de;
> bjorn.andersson@linaro.org; jagan@amarulasolutions.com;
> enric.balletbo@collabora.com; marc.w.gonzalez@free.fr; olof@lixom.net;
> devicetree@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux-
> kernel@vger.kernel.org; linux-pm@vger.kernel.org; dl-linux-imx <linux-
> imx@nxp.com>
> Subject: Re: [PATCH 3/3] cpufreq: imx-sc: add i.mx system controller cpufreq
> support
>
> On 13-02-19, 08:53, Anson Huang wrote:
> > Forgot to mention, i.MX system controller cpufreq actually can NOT do
> > any CPU clock/voltage scaling from Linux kernel, they are controlled
> > by system controller firmware and ONLY can be requested via RPC with
> > secure mode, so Linux kernel has to call SMC and trap to
> > ARM-Trusted-Firmware to do it, in this case, is cpufreq-dt still
> > suitable to support it? I saw cpufreq-dt driver will do CPU clock/voltage
> scaling directly.
>
> What about moving those SMC calls to the clk-driver, then it wouldn't matter
> to the cpufreq driver on how the clock is getting changed.
OK, thanks, I will have a try and resend the patch.
Anson.
>
> --
> viresh
next prev parent reply other threads:[~2019-02-13 10:35 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-13 3:08 [PATCH 1/3] arm64: dts: freescale: imx8qxp: add cpu opp table Anson Huang
2019-02-13 3:09 ` [PATCH 2/3] arm64: defconfig: enable i.mx system controller cpufreq Anson Huang
2019-02-13 3:09 ` [PATCH 3/3] cpufreq: imx-sc: add i.mx system controller cpufreq support Anson Huang
2019-02-13 7:09 ` Viresh Kumar
2019-02-13 8:46 ` Anson Huang
2019-02-13 8:53 ` Anson Huang
2019-02-13 10:15 ` Viresh Kumar
2019-02-13 10:35 ` Anson Huang [this message]
2019-02-13 10:12 ` Viresh Kumar
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