On Fri, Jul 04, 2008 at 11:57:14AM +0200, Andre Schwarz wrote: > Sascha, Grant, > > I'm running on 2.6.26-rc6 with an MPC5200B based system. > > Looks like some (for me) crucial GPIO are touched during boot. > Is this possible ? > > Of course I have compiled in GPIO-Lib and specified the GPIOs in the dts. > But no access yet - I'd like to preserve the setup from u-boot...
The GPIO driver only writes to the GPIO registers when a driver actually requests to use them. At probe time, the gpio drivers read the current values from the GPIO registers, so current config should be preserved. However, the gpiochip_dir hook explicitly sets the output value when it is called. It may be that when you are claiming the GPIO line it is getting set with a default (and wrong) value. Another possibility; have you verified that it is the GPIO regs getting clobbered? Or is port_config getting changed on you? Which GPIO pins? g. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev