[RFC PATCH] imx: imx8mm-evk/imx8mn-evk: enable sysreset driver for SPL

[Peng Fan]

> Subject: Re: [RFC PATCH] imx: imx8mm-evk/imx8mn-evk: enable sysreset
> driver for SPL
> 
> On 1/17/20 3:33 AM, Peng Fan wrote:
> > Hi Marek,
> 
> Hi,
> 
> >> Subject: Re: [RFC PATCH] imx: imx8mm-evk/imx8mn-evk: enable sysreset
> >> driver for SPL
> >>
> >> On 1/16/20 3:21 AM, Peng Fan wrote:
> >>
> >> Hello Peng,
> >>
> >>>> Subject: [RFC PATCH] imx: imx8mm-evk/imx8mn-evk: enable sysreset
> >>>> driver for SPL
> >>>>
> >>>
> >>> NAK, this will not work on i.MX8MM/N.
> >>>
> >>> Currently sysreset psci is enabled, however psci will not work for
> >>> SPL, because SPL boots before BL31.
> >>
> >> Thank you for the constructive feedback.
> >>
> >> So basically , what we need is a real sysreset driver for iMX8MM ,
> >> which can work with bare-bones hardware interface, that is, poking
> >> some register, correct ?
> >
> > Yes.
> >
> >>
> >> So, either you or Claudius needs to implement a driver in
> >> drivers/sysreset, which will bind in SPL and if needed, do some
> >> writel() into some registers to reset the board, correct ?
> >
> > Yes.
> >
> >>
> >> Because, I believe we can both agree that dumping such ad-hoc code
> >> which implements reset in board code is not the right way, esp.
> >> nowadays with all the DM/DT stuff in.
> >
> > Alought we still have ocram space, but our SPL is huge now, 100KB+
> 
> How so ?
> 
> How much does DM sysreset add to that ?

currently I am a bit hesitated about DM SPL,
but it let us not to maintain two drivers for one module.
Just some complaining words:)
I am fine to add DM sysreset currently.
Not sure how much it will add after DM usb.

Regards,
Peng.