On Thu, Jan 14, 2016 at 11:32 PM, Roger Shimizu <rogershim...@gmail.com> wrote: > Dear Uwe, > > On Thu, Jan 14, 2016 at 11:08 PM, Uwe Kleine-König > <uwe+deb...@kleine-koenig.org> wrote: >>>>> I need to run the following command to enable USB port on Linkstation >>>>> LS-WXL/WSXL (armel/kirkwood with DTS [0] ): >>>>> echo 37 >/sys/class/gpio/export >>>>> echo out > /sys/class/gpio/gpio37/direction >>>>> echo 1 > /sys/class/gpio/gpio37/value >> >> Can you post the contents of /sys/kernel/debug/gpio when the broken >> kernel is running? > > Thanks for the debugging tool! > It seems there's clue ... > > Here's the log for working & non-working kernel: > > # uname -a > Linux LS-WXL 4.2.0-0.bpo.1-kirkwood #1 Debian 4.2.6-3~bpo8+2 > (2015-12-14) armv5tel GNU/Linux > # mount -t debugfs none /sys/kernel/debug > # cat /sys/kernel/debug/gpio > GPIOs 0-31, platform/f1010100.gpio, f1010100.gpio: > gpio-28 (HDD0 Power ) out hi > gpio-29 (HDD1 Power ) out hi > > GPIOs 32-49, platform/f1010140.gpio, f1010140.gpio: > gpio-34 (? ) out hi > gpio-35 (? ) out hi > gpio-37 (? ) out lo > gpio-38 (? ) out hi > gpio-40 (? ) out hi > > # uname -a > Linux LS-WXL 3.16.0-4-kirkwood #1 Debian 3.16.7-ckt7-1 (2015-03-01) > armv5tel GNU/Linux > # mount -t debugfs none /sys/kernel/debug > # cat /sys/kernel/debug/gpio > GPIOs 0-31, platform/f1010100.gpio, f1010100.gpio: > gpio-28 (HDD0 Power ) out hi > gpio-29 (HDD1 Power ) out hi > > GPIOs 32-49, platform/f1010140.gpio, f1010140.gpio: > gpio-34 (lswxl:red:hdderr0 ) out hi > gpio-35 (lswxl:red:hdderr1 ) out hi > gpio-37 (lswxl:red:func ) out lo > gpio-38 (lswxl:amber:info ) out hi > gpio-40 (lswxl:blue:power ) out hi
For above gpio-XX and it's string, I know there're gpio pin definition errors for gpio 32-49. Now I understand gpio 32-49 should be defined as gpio1 XX, and XX should be real pinnumber - 32. e.g. GPIO 37 should be defined as "gpio1 5" After I modified DTS as above new gpio[01] pinnumber, the debug info is like: GPIOs 0-31, platform/f1010100.gpio, f1010100.gpio: gpio-28 (HDD0 Power ) out hi gpio-29 (HDD1 Power ) out hi GPIOs 32-49, platform/f1010140.gpio, f1010140.gpio: gpio-37 (USB Power ) out hi gpio-41 (Function Button ) in hi (act lo) - IRQ edge (clear ) gpio-42 (Power-on Switch ) in lo (act hi) - IRQ edge (clear ) gpio-43 (Power-auto Switch ) in hi (act lo) - IRQ edge (clear ) So gpio-37 is HIGH by default now. Although gpio export is still not working on previously reported kernel version, my problem seems get solved. Cheers, Roger
