[AST2600] PWM/TACH driver and dbus-sensor issue

[Tung Nguyen OS]

Dear community,
We have ported the PWM/TACH hwmon driver for AST2600 from ASPEED's repository https://github.com/AspeedTech-BMC/linux/tree/aspeed-master-v5.4/drivers/hwmon to support Ampere Computing's systems. Verify with AST2600 EVB, i can see the driver works. However there is a concern like:
1. The change of hwmon fan pwm/tach in sysfs (as below), this is different from the ast2500 as the separated of the fan*_input and pwm1 in various hwmon directories. At this time, the driver doesn't exist in the OpenBMC linux at https://github.com/openbmc/linux. Is OpenBMC going to merge and keep this driver ?

root at mtmitchell:~# ls -la /sys/class/hwmon/hwmon
hwmon0/ hwmon1/ hwmon2/ hwmon3/ hwmon4/ hwmon5/ hwmon6/ hwmon7/ hwmon8/ hwmon9/
root at mtmitchell:~# ls -la /sys/class/hwmon/hwmon0/
drwxr-xr-x    3 root     root             0 Jan  1  1970 .
drwxr-xr-x    3 root     root             0 Jan  1  1970 ..
lrwxrwxrwx    1 root     root             0 Feb  9 08:38 device -> ../../../1e610000.pwm_tach:tach
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan10_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan11_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan12_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan13_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan14_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan15_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan16_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan1_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan2_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan3_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan4_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan5_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan6_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan7_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan8_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 fan9_input
-r--r--r--    1 root     root          4096 Feb  9 08:38 name
lrwxrwxrwx    1 root     root             0 Feb  9 08:38 of_node -> ../../../../../../../../firmware/devicetree/base/ahb/apb/pwm_tach at 1e610000/tach
drwxr-xr-x    2 root     root             0 Feb  9 08:38 power
lrwxrwxrwx    1 root     root             0 Jan  1  1970 subsystem -> ../../../../../../../../class/hwmon
-rw-r--r--    1 root     root          4096 Jan  1  1970 uevent
root at mtmitchell:~# ls -la /sys/class/hwmon/hwmon*/pwm*
-rw-r--r--    1 root     root          4096 Feb  9 09:13 /sys/class/hwmon/hwmon1/pwm1
-rw-r--r--    1 root     root          4096 Feb  9 09:20 /sys/class/hwmon/hwmon2/pwm1
-rw-r--r--    1 root     root          4096 Feb  9 08:38 /sys/class/hwmon/hwmon3/pwm1
-rw-r--r--    1 root     root          4096 Feb  9 08:38 /sys/class/hwmon/hwmon4/pwm1
-rw-r--r--    1 root     root          4096 Feb  9 08:38 /sys/class/hwmon/hwmon5/pwm1
-rw-r--r--    1 root     root          4096 Feb  9 08:38 /sys/class/hwmon/hwmon6/pwm1
-rw-r--r--    1 root     root          4096 Feb  9 08:38 /sys/class/hwmon/hwmon7/pwm1
-rw-r--r--    1 root     root          4096 Feb  9 08:38 /sys/class/hwmon/hwmon8/pwm1

2. With above changes, the dbus-sensor for FAN/PWM shall not work because of the compatibility. So if OpenBMC want to keep above PWM/TACH driver, does any sides have the plan to support the fan sensor, if not, we can join and do it.

Thank you and best regards,
Tung