Hi Michael, On Thu, Jan 25, 2018 at 11:06 AM, Michael Trimarchi <mich...@amarulasolutions.com> wrote: > SION bit should be used in the situation that we need > to read back the value of a pin and should not be set by > default macro. > > We get some malfunction as raised by following thread > > https://www.spinics.net/lists/linux-usb/msg162574.html > > As reported by this application note: > https://www.nxp.com/docs/en/application-note/AN5078.pdf > > The software input on (SION) bit is an option to force an input > path to be active regardless of the value driven by the > corresponding module. It is used when the nature direction > of a pin depending on selected alternative function is an output, > but it is needed to read the real logic value on a pin. > > The SION bit can be used in: > • Loopback: the module of a selected alternative function drives > the pad and also receives the pad value as an input > • GPIO capture: the module of a selected alternative function > drives the pin and the value is captured by the GPIO > > SION bit is not necessary when the pin is configured as a peripheral > apart specific silicon bug. If an application needs to have this > set, this should be done in board file or in dts file > > Signed-off-by: Michael Trimarchi <mich...@amarulasolutions.com>
Please keep my previous Reviewed-by tag. Here it goes again: Reviewed-by: Fabio Estevam <fabio.este...@nxp.com> Thanks _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
