On Thu, 30 Mar 2017 18:26:01 +0100 Simon Hatliff <hatl...@cadence.com> wrote:
> > Another solution would be to write 0xffffffff into CDNS_GPIO_OUTPUT_EN > > at probe time so that each time CDNS_GPIO_DIRECTION_MODE is modified to > > set a pin in output mode, the CDNS_GPIO_OUTPUT_EN is already correctly > > configured. > > Simon, would that work? Is there a good reason to keep a bit in > > CDNS_GPIO_OUTPUT_EN set to 0 when the GPIO is in input mode (power > > consumption?)? > If direction_mode is set to input then output_en is ignored so this > should work. The hardware defaults to output mode, so as long as you > set all pins to input mode before you set all output_en bits there > should be no negative effect. Okay, I'll try something like that, except I'll probably keep already output-enabled in their existing state to avoid modifying bootloader's GPIO settings. Thanks for the feedback. Boris
