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Subject: Re: The common solution to support bind/unbind the hwmon driver base
 on the host state.
To: Thu Nguyen OS <thu@os.amperecomputing.com>,
 "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
References: <7252DA19-35E9-4A14-A7DF-7BBC54A312C2@amperemail.onmicrosoft.com>
From: Joseph Reynolds <jrey@linux.ibm.com>
Message-ID: <12cb9e34-d110-1575-0b39-296083bd6410@linux.ibm.com>
Date: Wed, 31 Mar 2021 11:14:39 -0500
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On 3/30/21 9:14 PM, Thu Nguyen OS wrote:
> Hi All, Currently, In Mtjade platform of Ampere, we have SMPro mdf=20
> drivers (SMPro hwmon, SMPro errmon, SMPro misc driver). The drivers=20
> will be loaded by kernel when the BMC boot up. But they are only=20
> binded when the host is already On. =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D=20
>
> Hi All,
>
> Currently, In Mtjade platform of Ampere, we have SMPro mdf drivers=20
> (SMPro hwmon, SMPro errmon, SMPro misc driver).
>
> The drivers will be loaded by kernel when the BMC boot up. But they=20
> are only binded when the host is already On.
>
> They are also unbinded when the host is Off.
>
> To support binding/unbinding the SMPro drivesr, we have one service=20
> name driver-binder.
>
>  1. When the Dbus property CurrentHostState of service
>     xyz.openbmc_project.State.Host changes to =E2=80=9Cnot Off=E2=80=9D, =
we will bind
>     the drivers.
>  2. When the Dbus property RequestedHostTransition of service
>     xyz.openbmc_project.State.Host OR Dbus property
>     RequestedPowerTransition of xyz.openbmc_project.State.Chassis
>
> change to Off, we will unbind the drivers.
>
> The driver-binder is working as expected, it have the configuration=20
> file to configure which drivers will be binded/unbinded.
>
> But that is our solution.
>
> Do we have any common solution to do that job?
>

Thu,

I don't have a solution.=C2=A0 But I do want to be able to bind and unbind=
=20
drivers for the BMC-attached USB ports (as the underlying mechanism when=20
the BMC admin disables the ports), so I think it would be good to have a=20
common solution or understand the best practices.

Joseph

> Regards.
>
> Thu Nguyen.
>