Aspeed2600 EVB Hwmon problem

[Eric.Wetterlind at gd-ms.com]

Hello,

I am currently trying to add a simple temp sensor to my image, which is based off of the evb-ast2600 image.  I have successfully been able to add this sensor to a ast2500-based image, but the 2600 is not cooperating.  Any pointers would be greatly appreciated (and sanity-saving), as I am near the end of all paths I know of.

Project bblayers.conf.sample contains the following:
==========
  ##OEROOT##/meta \
  ##OEROOT##/meta-poky \
  ##OEROOT##/meta-openembedded/meta-oe \
  ##OEROOT##/meta-openembedded/meta-networking \
  ##OEROOT##/meta-openembedded/meta-python \
  ##OEROOT##/meta-phosphor \
  ##OEROOT##/meta-aspeed \
  ##OEROOT##/meta-ourproject \
===========

The device tree has this (and using the standard aspeed_g6_dtsi):
===========
&i2c1 {
        status = "okay";

        tmp423 at 4c {
                compatible = "ti,tmp423";
                reg = <0x4c>;
        };
};
===========

Recipes-phosphor/sensors contains the directory structure phosphor-hwmon/obmc/hwmon/ahb/apb/bus at 1e78a000/i2c-bus at 100, with tmp423.conf in it.

The phosphor-hwmon_%.bbappend file contains this:

===========
FILESEXTRAPATHS_prepend_ourproject := "${THISDIR}/${PN}:"
EXTRA_OECONF_append_ourproject = " --enable-negative-errno-on-fail"
CHIPS = " \
        bus at 1e78a000/i2c-bus at 100/tmp423 at 4c \
        "
ITEMSFMT = "ahb/apb/{0}.conf"
ITEMS = "${@compose_list(d, 'ITEMSFMT', 'CHIPS')}"
ENVS = "obmc/hwmon/{0}"
SYSTEMD_ENVIRONMENT_FILE_${PN}_append_ourproject = " ${@compose_list(d, 'ENVS', 'ITEMS')}"
===========

When booting up in Qemu, the device is recognized:
===========
#cat /sys/firmware/devicetree/base/ahb/apb/bus at 1e78a000/i2c-bus at 100/tmp423 at 4c/compatible
ti,tmp423

# cat /sys/devices/platform/ahb/ahb\:apb/ahb\:apb\:bus\@1e78a000/1e78a100.i2c-bus/i2c-1/1-004c/name
tmp423
===========

There is even a link in /sys/bus/i2c/devices/1-004c to /sys/devices/platform/ahb/ahb\:apb/ahb\:apb\:bus\@1e78a000/1e78a100.i2c-bus/i2c-1/1-004c.

The .conf file shows up in /etc/default/obmc/hwmon/ahb/apb/bus at 1e78a000/i2c-bus at 100.

The problem is that nothing ever gets populated into /sys/class/hwmon.  It is an empty directory.  On our ast2400 and ast2500 images, this same procedure, stripped down to almost the exact same specs as I've mentioned above, produces a link as /sys/class/hwmon/hwmon0.

What am I missing?

Regards,
-Eric
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