Best Regards! Anson Huang
> -----Original Message----- > From: Viresh Kumar [mailto:[email protected]] > Sent: 2019年2月13日 18:15 > To: Anson Huang <[email protected]> > Cc: [email protected]; [email protected]; [email protected]; > [email protected]; [email protected]; [email protected]; > [email protected]; [email protected]; [email protected]; > Aisheng Dong <[email protected]>; Daniel Baluta > <[email protected]>; Andy Gross <[email protected]>; > [email protected]; [email protected]; [email protected]; > [email protected]; [email protected]; > [email protected]; [email protected]; [email protected]; > [email protected]; [email protected]; linux- > [email protected]; [email protected]; dl-linux-imx <linux- > [email protected]> > 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
