Hi, toggling the green LED (GPIO 65) on Olinuxino Maxi unexpectedly also toggles the USB Host support. Here is the console output: # Switching the led off (USB drive connected) echo 255 > /sys/class/leds/green/brightness [ 318.650000] ci_hdrc ci_hdrc.0: timeout waiting for 00000800 in 11 [ 318.650000] ci_hdrc ci_hdrc.0: EHCI Host Controller [ 318.670000] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1 [ 318.710000] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00 [ 318.750000] hub 1-0:1.0: USB hub found [ 318.780000] hub 1-0:1.0: 1 port detected [ 319.140000] usb 1-1: new high-speed USB device number 2 using ci_hdrc [ 319.310000] hub 1-1:1.0: USB hub found [ 319.340000] hub 1-1:1.0: 3 ports detected [ 319.640000] usb 1-1.1: new high-speed USB device number 3 using ci_hdrc [ 319.880000] usb 1-1.2: new high-speed USB device number 4 using ci_hdrc [ 320.030000] usb-storage 1-1.2:1.0: USB Mass Storage device detected [ 320.040000] scsi host0: usb-storage 1-1.2:1.0 [ 321.090000] scsi 0:0:0:0: Direct-Access LG USB Drive 1100 PQ: 0 ANSI: 0 CCS # Switching the led on (USB drive connected) echo "0" > /sys/class/leds/green/brightness [ 1068.890000] ci_hdrc ci_hdrc.0: remove, state 1 [ 1068.890000] usb usb1: USB disconnect, device number 1 [ 1068.920000] usb 1-1: USB disconnect, device number 2 [ 1068.920000] usb 1-1.1: USB disconnect, device number 3 [ 1069.070000] usb 1-1.2: USB disconnect, device number 4 [ 1069.450000] ci_hdrc ci_hdrc.0: USB bus 1 deregistered [ 1074.460000] ci_hdrc ci_hdrc.0: timeout waiting for 00000800 in 11 Kernel: 4.0.0-rc4-next-20150320 Bootloader: U-Boot 2014-10 Harald discovered this problem before me on Olinuxino Mini [1]. I think the problem has something to with USB OTG, because GPIO 65 is on the same pin for USB_OTG_ID. My idea was to set "dr_mode" in olinuxino dts explicit to "host" and it works, but i'm not sure that is the right fix. Shouldn't chipidea driver complain about missing pinctrl or something else? Stefan [1] - https://www.olimex.com/forum/index.php?topic=4271.0 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
