Re: [PATCHv1] rtc: bcm-iproc: Add support for Broadcom iproc rtc

[Arun Ramamurthy]

Hi Arnd

My apologies for the late reply, I was moved to other work items. I 
wanted to get more clarification on the syscon issue so that I can 
submit the next patch set. If I understand correctly, you would like
me to move the CRMU logic to a new driver under mfd/ and use the syscon
api calls in my rtc driver? Thanks

Arun

On 14-12-17 06:31 AM, Arnd Bergmann wrote:
> On Tuesday 16 December 2014 13:54:04 Arun Ramamurthy wrote:
> > On 14-12-16 12:27 PM, Ray Jui wrote:
> > > On 12/16/2014 12:19 PM, Arnd Bergmann wrote:
> > > > It sounds like CRMU is some other unit aside from the RTC. Could this
> > > > be something like a generic system controller? I think it should
> > > > either have its own driver or use the syscon logic if that is what
> > > > this is.
> > > Giving that CRMU has scattered, miscellaneous control logic for multiple
> > > different peripherals, it probably makes more sense to use the syscon
> > > logic here.
> > Arnd, thanks for the feedback. If I was to write a separate driver for
> > the CRMU, I would have to export certain functions and create an api
> > that only this RTC driver would use. I am not sure that is efficient or
> > required. What is your opinion?
> > Would it be better if I use the syson api in my current driver and move
> > the CRMU registers to separate syscon device tree entry?
>
> This is something that's normally up to the platform maintainers, depending
> on what works best for a given SoC. If you have a control block that
> wants to export the same high-level API for multiple drivers, that's
> fine, but if literally every register does something different, a syscon
> driver works best.
>
> It's also possible that some of the functions of the CRMU already have
> abstractions, like system-reset, device-reset, regulator or clock support.
> In that case, you can still use syscon but have the more other drivers
> use that for accessing the registers.
>
> 	Arnd
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