On Fri, Jun 21, 2013 at 11:17 PM, Stephen Warren <swarren@xxxxxxxxxxxxx> wrote: > On 06/20/2013 05:57 AM, Christian Ruppert wrote: > The Linux pinctrl subsystem specifically doesn't provide mutual > exclusion between "mux function" and GPIO usage within a pin group, > although perhaps a driver could internally. It used to block this at one point. But it doesn't make sense when the hardware looks like so: >> +- SPI >> Physical pins --- GPIO --- pinctrl -+- I2C >> +- mmc As in this case it is perfectly legal to enable the GPIO as input while the I2C bus is running and "spy" on the signals. The driver should probably not allow the GPIO output to be driven while some peripheral is muxed in though, that could be disastrous... Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
