linux-kernel - Re: [PATCH v6 8/9] misc: smpro-misc: Add Ampere's Altra SMpro misc driver

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Date:   Mon, 7 Mar 2022 14:16:06 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Quan Nguyen <quan@...amperecomputing.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Open Source Submission <patches@...erecomputing.com>,
        Phong Vo <phong@...amperecomputing.com>,
        "Thang Q . Nguyen" <thang@...amperecomputing.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>, linux-hwmon@...r.kernel.org,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
Subject: Re: [PATCH v6 8/9] misc: smpro-misc: Add Ampere's Altra SMpro misc driver

On Mon, Mar 7, 2022 at 9:32 AM Quan Nguyen <quan@...amperecomputing.com> wrote:
> > diff --git a/drivers/mfd/smpro-mfd.c b/drivers/mfd/smpro-mfd.c
> > index a7cd64bf9eaa..5611dd30f8f4 100644
> > --- a/drivers/mfd/smpro-mfd.c
> > +++ b/drivers/mfd/smpro-mfd.c
> > @@ -28,6 +28,7 @@ static const struct regmap_config simple_word_regmap_config = {
> >   static const struct mfd_cell smpro_devs[] = {
> >       MFD_CELL_NAME("smpro-hwmon"),
> >       MFD_CELL_NAME("smpro-errmon"),
> > +     MFD_CELL_NAME("smpro-misc"),
>
> [Lee Jones]
> Misc is a Linuxisum which are not allowed in DT.
>
> What does this driver actually do?
>
> [Quan]
> This drivers is to report the boot progress to BMC and allow BMC to
> configure the Soc Power Limit of Ampere's Altra family processor.

That doesn't sound like it should be platform specific at all, but rather
a generic BMC interface. I see you already have the openbmc list on Cc,
so I assume the right people can see this. Presumably this is a BMC that
already runs on openbmc and can have a platform-independent interface
for doing this.

        Arnd