Re: [PATCH 5/7] cpufreq: qcom-hw: Use regmap for accessing hardware registers

From: Viresh Kumar
Date: Tue Sep 08 2020 - 09:13:56 EST

On 08-09-20, 16:41, Manivannan Sadhasivam wrote:
> On 0908, Viresh Kumar wrote:
> > On 08-09-20, 13:27, Manivannan Sadhasivam wrote:
> > > Use regmap for accessing cpufreq registers in hardware.
> >
> > Why ? Please mention why a change is required in the log.
> >
> Only because it is recommended to use regmap for abstracting the hw access.

Yes it can be very useful in abstracting the hw access in case of
busses like SPI/I2C, others, but in this case there is only one way of
doing it with the exact same registers. I am not sure it is worth it
here. FWIW, I have never played with regmaps personally, and so every
chance I can be wrong here.

> Moreover it handles the proper locking for us in the core (spinlock vs mutex).

What locking do you need here ?

> I've seen many subsystem maintainers prefer regmap over plain readl/writel
> calls. I'll add the reason in commit log.

I am not sure if it is worth it here.