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

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Message-Id: <88040035-d971-4012-bb9f-9f2ae91fdc6e@app.fastmail.com>
Date:   Thu, 14 Dec 2023 15:48:55 +0000
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Tomer Maimon" <tmaimon77@...il.com>
Cc:     pmenzel@...gen.mpg.de, "Rob Herring" <robh+dt@...nel.org>,
        krzysztof.kozlowski+dt@...aro.org,
        "Conor Dooley" <conor+dt@...nel.org>, avifishman70@...il.com,
        tali.perry1@...il.com, "Joel Stanley" <joel@....id.au>,
        venture@...gle.com, yuenn@...gle.com, benjaminfair@...gle.com,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        openbmc@...ts.ozlabs.org,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] soc: nuvoton: add NPCM BPC driver

On Thu, Dec 14, 2023, at 14:09, Tomer Maimon wrote:
> On Thu, 14 Dec 2023 at 14:44, Arnd Bergmann <arnd@...db.de> wrote:
>> >
>> > +config NPCM_BPC
>> > +     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