Re: [PATCH v3 3/3] soc: nuvoton: add NPCM BPC driver

[Tomer Maimon <tmaimon77@xxxxxxxxx>]

Hi Arnd,

Thanks for your suggestion.

Appreciate it if Joel, OpenBMC Linux kernel maintainer,  could share
his thoughts about it.


On Thu, 14 Dec 2023 at 17:49, Arnd Bergmann <arnd@xxxxxxxx> wrote:
>
> On Thu, Dec 14, 2023, at 14:09, Tomer Maimon wrote:
> > On Thu, 14 Dec 2023 at 14:44, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> >> >
> >> > +config NPCM_BP
> >> > +     tristate "NPCM BIOS Post Code support"
> >> > +     depends on (ARCH_NPCM || COMPILE_TEST)
> >> > +     help
> >> > +       Provides NPCM driver to control the BIOS Post Code
> >> > +       interface which allows the BMC to monitor and save
> >> > +       the data written by the host to an arbitrary I/O port,
> >> > +       the BPC is connected to the host thourgh LPC or eSPI bus.
> >> > +
> >>
> >> This one in particular looks like this might be implemented
> >> by more than one BMC type, it's a fairly generic functionality.
> >>
> >> Have you talked to the other maintainers of SoCs used in
> >> OpenBMC about coming up with a common interface?
> > Yes, Both Nuvoton and Aspeed use the same user-facing code to manage
> > the host snooping.
> > https://github.com/openbmc/phosphor-host-postd
>
> Ok, that's good. I found the driver in drivers/soc/aspeed/aspeed-lpc-snoop.c
> now and see that the implementation looks very similar.
>
> I think we should do two things here:
>
>  - split out the common code into a shared module that exports the
>    symbols to be used by either one
>
>  - find a better place for both drivers outside of drivers/soc.
>    I would suggest drivers/misc/bmc/ but am open to other suggestions.
>
>       Arnd

Best regards,

Tomer