Re: [PATCH 3/3] cpufreq: imx-sc: add system controller cpufreq support

From: Viresh Kumar
Date: Wed Feb 13 2019 - 05:15:08 EST

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.