WL_REG_ON and how to reset or power off CYW43455 in Linux

[franck]

Hi,

our host is iMX8 and we are using the FMAC backport 5.10.9. The device tree defines mmc_pwrseq for the control of WL_REG_ON. Do you have any documentation explaining how we can switch on or off WiFi or reset the IC from a user application?

Thanks

[Lakhera · Accepted solution]

Hello,

Please refer the attached app note.
https://www.infineon.com/dgdl/Infineon-AN232689_-_Wi-Fi_software_user_guide-ApplicationNotes-v01_00-...

You can follow the following sequence for power-on and power-off Wifi -

Power on :
insmod compat.ko
insmod cfg80211.ko
insmod brcmutil.ko
insmod brcmfmac.ko

Power off-
rmmod brcmfmac.ko
rmmod brcmutil.ko
rmmod cfg80211.ko
rmmod compat.ko

Thanks,
Ambika

[Lakhera]

Hello, 

Please use wl up and wl down for turning on and off the wifi radio, respectively. 

In case you don't have the WL Tool, please contact your vendor. 

Thanks, 
Ambika

[franck]

Thank you Ambika for your reply.  In some device tree files from Murata (module 1MW) the wlreg_on regulator has been replaced by mmc-pwrseq-simple which is controlled by mmc core. Does it means that we have to go through some mmc PM interface to control wlreg_on? I'm not so familiar with the Linux PM system yet so I'm a bit lost but then I would expect we could power on/off or reset the mmc interface assigned to the Wi-Fi and by doing so also power on/off or reset the IC?

[Lakhera]

Please modify the  .config of the kernel source by setting CONFIG_DEBUG_FS=y as explained in - https://community.infineon.com/t5/Resource-Library/FMAC-Debugging/ta-p/246042

' echo 1 > /sys/kernel/debug/ieee80211/phy0/reset ' will reset the radio 

[franck]

rmmod brcmfmac and modprobe brcmfmac are working for me. Thanks a lot for your time.