Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> wrote: > Hello Thierry, > > On Thu, Nov 15, 2018 at 04:25:45PM +0100, Thierry Reding wrote: > > On Wed, Nov 14, 2018 at 10:51:20PM +0100, Uwe Kleine-König wrote: > > > On Wed, Nov 14, 2018 at 12:34:49PM +0100, Thierry Reding wrote: [...] > > > Also dts writes don't need to lookup the needed GPIO numbers and pinctrl. > > > > Just to clarify: I don't think that we need to get the GPIO number > > involved in this case, because we don't have to reconfigure the pin as > > GPIO to make this work. The only reason that Michal's proposal did that > > is because that was believed to be necessary. But if the pin can just be > > configured with a 100k pull-up, that's enough to pull the pin high when > > we need it. > > Unless the gpio happens to be configured as output at the wrong value. > Further I'm not sure if the pwm in disabled state actively pulls to 0 > and if in this state the PU of the pin is good enough to ensure a one > here. That would need verification first. > No. You can disable the output driver via pinctrl, so that only the selected pull-up/down is relevant. The pin function and GPIO register settings don't matter at all in this case. Lothar Waßmann -- ___________________________________________________________ Ka-Ro electronics GmbH | Pascalstraße 22 | D - 52076 Aachen Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10 Geschäftsführer: Matthias Kaussen Handelsregistereintrag: Amtsgericht Aachen, HRB 4996 www.karo-electronics.de | info@xxxxxxxxxxxxxxxxxxx ___________________________________________________________
