linux-kernel - Re: CONFIG_SENSORS_OCC_P8

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Message-ID: <1085cc7c-00af-83f3-7da6-7820143b162e@roeck-us.net>
Date:   Sun, 4 Dec 2022 10:37:09 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Borislav Petkov <bp@...en8.de>,
        Eddie James <eajames@...ux.vnet.ibm.com>
Cc:     linux-hwmon@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: CONFIG_SENSORS_OCC_P8_I2C

On 12/4/22 09:55, Borislav Petkov wrote:
> Hi,
> 
> make oldconfig asks me here on a x86 machine about this below and it
> looks like this should depend on some P8 config item so that it doesn't
> show on other architectures.
> 
> Right?
> 

I don't immediately see why this should depend on a P8 configuration.
The driver runs on a BMC, after all. My understanding is that a BMC can be
of any architecture. Is there a guarantee that there are and never will be
any x86 BMCs, and/or that BMCs are limited to a certain subset of
architectures ?

Thanks,
Guenter

> Thx.
> 
> CONFIG_SENSORS_OCC_P8_I2C:
> 
> This option enables support for monitoring sensors provided by the
> On-Chip Controller (OCC) on a POWER8 processor. However, this driver
> can only run on a baseboard management controller (BMC) connected to
> the P8, not the POWER processor itself. Communications with the OCC are
> established through I2C bus.
> 
> This driver can also be built as a module. If so, the module will be
> called occ-p8-hwmon.
> 
> Symbol: SENSORS_OCC_P8_I2C [=n]
> Type  : tristate
> Defined at drivers/hwmon/occ/Kconfig:6
>    Prompt: POWER8 OCC through I2C
>    Depends on: HWMON [=y] && I2C [=y]
>    Location:
>      -> Device Drivers
>        -> Hardware Monitoring support (HWMON [=y])
>          -> POWER8 OCC through I2C (SENSORS_OCC_P8_I2C [=n])
> Selects: SENSORS_OCC [=n]
>