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From: Mahesh Kurapati <mahesh.kurapati@keysight.com>
To: "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: FruDevice/Entity Manager vs hwmon
Thread-Topic: FruDevice/Entity Manager vs hwmon
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Content-Type: text/plain; charset="us-ascii"
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Hello,

I want to define temperature sensors, fans and PSUs for our new platform.  =
Going through the documentation and sources,  I understand that there are t=
wo approaches.  One is to define them with the same i2c path as mentioned i=
n the device tree as part of the hwmon configuration, and the other approac=
h is to define a json file with appropriate probe in the entity-manager/con=
figurations folder so that the FruDevice and Entity Manager apps detect the=
 devices as per the probe and create the matching dbus objects, while the d=
bus-sensors do the instrumentation.  With entity manager approach I underst=
and that the i2c devices are created/probed when they are detected.  My que=
stions is we don't need the device defined in the device tree file if I go =
by this approach? I understand that this helps the dynamic detection of the=
 FRU.  Also we have LM73, and other temp sensor TMP431c that is not defined=
 in the FruDevice record map.  Next question is do I need to add support fo=
r the LM73 tmp75MP431C and other one in the FruDevice so that it gets creat=
ed properly? Can I use any existing strings/mapping for these sensors?  Thi=
s is not needed if I define the entries in the device tree, and integrate w=
ith hwmon I have everything needed.  I see that hwmon and FruDevice/Entity =
Manager/dbus-sensors provide similar functionality.  Can I have both of the=
se services running at the same time on the BMC? Will it cause any conflict=
s?  Please help me understand.

Thank you,
Mahesh

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<p class=3D"MsoNormal">Hello, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I want to define temperature sensors, fans and PSUs =
for our new platform.&nbsp; Going through the documentation and sources, &n=
bsp;I understand that there are two approaches.&nbsp; One is to define them=
 with the same i2c path as mentioned in the device
 tree as part of the hwmon configuration, and the other approach is to defi=
ne a json file with appropriate probe in the entity-manager/configurations =
folder so that the FruDevice and Entity Manager apps detect the devices as =
per the probe and create the matching
 dbus objects, while the dbus-sensors do the instrumentation.&nbsp; With en=
tity manager approach I understand that the i2c devices are created/probed =
when they are detected.&nbsp; My questions is we don&#8217;t need the devic=
e defined in the device tree file if I go by this
 approach? I understand that this helps the dynamic detection of the FRU.&n=
bsp; Also we have LM73, and other temp sensor TMP431c that is not defined i=
n the FruDevice record map.&nbsp; Next question is do I need to add support=
 for the LM73 tmp75MP431C and other one in
 the FruDevice so that it gets created properly? Can I use any existing str=
ings/mapping for these sensors? &nbsp;This is not needed if I define the en=
tries in the device tree, and integrate with hwmon I have everything needed=
.&nbsp; I see that hwmon and FruDevice/Entity
 Manager/dbus-sensors provide similar functionality.&nbsp; Can I have both =
of these services running at the same time on the BMC? Will it cause any co=
nflicts? &nbsp;Please help me understand.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thank you, <o:p></o:p></p>
<p class=3D"MsoNormal">Mahesh<o:p></o:p></p>
</div>
</body>
</html>

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