On Thu, Oct 8, 2015 at 6:55 PM, Andreas Werner <[email protected]> wrote:
> The register is currently impelemented as a read/write register > which means the pin mode is configurable by software to > Push Pull or Open Drain. OK then you can set it in accordance to what clients request. > There is also the possiblity (normal way) that the HW (FPGA) configures > each pin to the correct mode. > > Is there actually a way to set an output mode from userland or by the gpio > API? As per <linux/gpio/machine.h> you can specify per-line if it should be open drain using GPIO_OPEN_DRAIN, this will push through to the gpio descriptor and those lines with this flag set will be handled specially. We have merged device tree bindings for OD/OS but not code to handle these, but I might have some code from Laurent Pinchart cooking for the DT in-kernel backend too. > I did not find anything about that. git grep OPEN_DRAIN Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
