Hi, > Am 28.09.2016 um 05:37 schrieb Tony Lindgren <tony@xxxxxxxxxxx>: > > * H. Nikolaus Schaller <hns@xxxxxxxxxxxxx> [160927 13:11]: >>> Am 27.09.2016 um 21:49 schrieb Tony Lindgren <tony@xxxxxxxxxxx>: >>> How about this for defaults: >>> >>> - heartbeat for led3 >>> - cpu0 for led4 >>> - cpu1 for led5 >> >> Good idea. Will try. >> >> What I don't exactly know is if these gpios based on an I2C-expander >> can handle cpu activity triggers or if they are locked up if this i2c >> processing triggers another cpu activity... > > Oh right, if the GPIOs are on the i2c bus yes, they are all gpio9 which is the tca6424 on i2c5. > it's probably not a good > idea :) Or at least will be inaccurate if the bus can sleep. I have tested a little by writing to /sys/class/leds/.../trigger. If I make one LED trigger by "cpu0" it is always on and if I make a second one triggered by "cpu1" the heartbeat becomes irregular. So indeed this does not work. BR, Nikolaus -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
