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Hello,
I have multiple W1-busses based on using DS2482 I2C to W1 interfaces. In W1 file system installed the file "therm_bulk_read" is merely found in the w1_bus_master1 directories, but not in others.

W1 file system is installed either manually via

sudo modprobe ds2482
sudo sh -c "echo ds2482 0x18 > /sys/bus/i2c/devices/i2c-1/new_device"
sudo sh -c "echo ds2482 0x1c > /sys/bus/i2c/devices/i2c-1/new_device"
sudo modprobe wire

or via rc.local

DS 2482 and DS 2482-8 are used.

As examples directories of master1 and master9 are given.

/sys/bus/w1/devices/w1_bus_master1 $ ls -l
insgesamt 0
drwxr-xr-x 4 root root 0 27. Mai 00:25 28-01192d063d95
drwxr-xr-x 4 root root 0 27. Mai 00:25 28-01192d089b62
drwxr-xr-x 4 root root 0 27. Mai 00:25 28-01192d11a780
drwxr-xr-x 4 root root 0 27. Mai 00:25 28-01192d1452cf
drwxr-xr-x 4 root root 0 27. Mai 00:25 28-01192d18e08b
drwxr-xr-x 4 root root 0 27. Mai 00:25 28-01192d19350a
drwxr-xr-x 4 root root 0 27. Mai 00:25 28-01192d1b650a
lrwxrwxrwx 1 root root 0 27. Mai 13:34 driver -> ../../bus/w1/drivers/w1_master_driver
drwxr-xr-x 2 root root 0 27. Mai 13:34 power
lrwxrwxrwx 1 root root 0 27. Mai 00:25 subsystem -> ../../bus/w1
-rw-rwxrwx 1 root root 4096 27. Mai 08:17 therm_bulk_read
-rw-r--r-- 1 root root 4096 27. Mai 00:25 uevent
-rw-rw-r-- 1 root root 4096 27. Mai 13:44 w1_master_add
-r--r--r-- 1 root root 4096 27. Mai 13:44 w1_master_attempts
-rw-rw-r-- 1 root root 4096 27. Mai 13:44 w1_master_max_slave_count
-r--r--r-- 1 root root 4096 27. Mai 13:44 w1_master_name
-r--r--r-- 1 root root 4096 27. Mai 13:44 w1_master_pointer
-rw-rw-r-- 1 root root 4096 27. Mai 13:44 w1_master_pullup
-rw-rw-r-- 1 root root 4096 27. Mai 13:44 w1_master_remove
-rw-rw-r-- 1 root root 4096 27. Mai 13:44 w1_master_search
-r--r--r-- 1 root root 4096 27. Mai 13:44 w1_master_slave_count
-r--r--r-- 1 root root 4096 27. Mai 08:05 w1_master_slaves

.......
/sys/bus/w1/devices/w1_bus_master9 $ ls -l
insgesamt 0
drwxr-xr-x 4 root root 0 27. Mai 00:25 28-0300a2793061
drwxr-xr-x 4 root root 0 27. Mai 00:25 28-0300a279b40c
lrwxrwxrwx 1 root root 0 27. Mai 13:34 driver -> ../../bus/w1/drivers/w1_master_driver
drwxr-xr-x 2 root root 0 27. Mai 13:34 power
lrwxrwxrwx 1 root root 0 27. Mai 00:25 subsystem -> ../../bus/w1
-rw-r--r-- 1 root root 4096 27. Mai 00:25 uevent
-rw-rw-r-- 1 root root 4096 27. Mai 13:34 w1_master_add
-r--r--r-- 1 root root 4096 27. Mai 13:34 w1_master_attempts
-rw-rw-r-- 1 root root 4096 27. Mai 13:34 w1_master_max_slave_count
-r--r--r-- 1 root root 4096 27. Mai 13:34 w1_master_name
-r--r--r-- 1 root root 4096 27. Mai 13:34 w1_master_pointer
-rw-rw-r-- 1 root root 4096 27. Mai 13:34 w1_master_pullup
-rw-rw-r-- 1 root root 4096 27. Mai 13:34 w1_master_remove
-rw-rw-r-- 1 root root 4096 27. Mai 13:34 w1_master_search
-r--r--r-- 1 root root 4096 27. Mai 13:34 w1_master_slave_count
-r--r--r-- 1 root root 4096 27. Mai 13:34 w1_master_slaves
-r--r--r-- 1 root root 4096 27. Mai 13:34 w1_master_timeout
-r--r--r-- 1 root root 4096 27. Mai 13:34 w1_master_timeout_us

Up to date Raspberry Bullseye 64-bit is used.

Regards
H. Wissing

While testing multiple one-wire devices I detected the issue that
echo trigger >therm_bulk_read
that typically will take ~1 second (still don't understand why it can't do this asynchronously and return right away) will return immediately and not trigger conversions (cat w1_slave on any device takes ~1 second which with working bulk_read will returns instantly).
I could reproduce this with both adding a DS2423 and a DS2438 device (single or both). Once the devices get removed it starts working again.

I'm using kernel 5.10.63-v7l+ on a fully updated Raspbian buster on a Raspberry Pi 4

Hello,
I've tried triggering a bulk-conversion via writing "trigger" to the file therm_bulk_read as described

def iniTherm_bulk_read():
fdr = open("/sys/bus/w1/drivers/w1_master_driver/w1_bus_master1/therm_bulk_read", "w")
fdr.write("trigger")
fdr.close()

no action is seen using Python3 file systen but with after a bash call:

def iniTherm_bulk_read():
os.popen("echo trigger > /sys/bus/w1/drivers/w1_master_driver/w1_bus_master1/therm_bulk_read")

User permissions are set manually beforehand. Up to date Raspberry Bullseye 64-bit is used.

Regards
H. Wissing