support for gpio as ipmb sensor

[naveen moses]

Hi Andrew,

Thanks for the suggestions. please find my comments below:

What do you mean when you say "cannot be directly monitored using gpio
monitor"?

Naveen : The gpio is connected via ipmb bridge interface so to read its state it should be done via ipmb call.
so, it cannot be specified as direct gpio config to be read by gpio-monitor process.

What about modelling the behaviour the GPIO state represents rather
than just providing a DBus interface to the GPIO values?

Naveen : The gpio behavior is done in separate process and there is a separate process which is depends on the gpio state.
Here the implementation is not for a specific gpio. there are 10 to 30 similiar gpios
which can be only accessed via ipmb bridge interface.  The ipmb gpio sensor we are proposing
could be for multiple number ipmb based gpios. The states of the individual ipmb gpios are monitored if they are configured in entity manager as gpio sensors.
their state is updated as sensor state property which can be read by other dependent properties.

Thanks,
Naveen
________________________________
From: Andrew Jeffery <andrew at aj.id.au>
Sent: Wednesday, October 6, 2021 5:46 AM
To: naveen moses <naveen.moses at hotmail.com>; openbmc at lists.ozlabs.org <openbmc at lists.ozlabs.org>
Cc: Zhikui Ren <zhikui.ren at intel.com>; Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>; Vernon Mauery <vernon.mauery at linux.intel.com>; Ed Tanous <ed at tanous.net>; naveen moses <naveen.moses at outlook.com>
Subject: Re: support for gpio as ipmb sensor

Hi Naveen,

On Tue, 5 Oct 2021, at 23:46, naveen moses wrote:
> Hi All,
>
> we have a couple of gpios ( input ) accessed via ipmb commands in our platform.
> which cannot be directly monitored using gpio monitor.

What do you mean when you say "cannot be directly monitored using gpio
monitor"?

>
> our idea is to expose them as ipmb sensors which has gpio state as
> property which is updated based
> on the current state of the gpio.
>
> at present there is no compatible interface under
> xyz/openbmc_project/sensors for gpio as sensor.
>
> So is this acceptable to create a new interface for gpio state under
> xyz/openbmc_project/sensors :
> interface name : gpioState
> which has a property named value whose possible values are boolean
> (true or false).

What about modelling the behaviour the GPIO state represents rather
than just providing a DBus interface to the GPIO values?

Andrew
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ozlabs.org/pipermail/openbmc/attachments/20211007/579de0d2/attachment.htm>