On Tue, 25 Jul 2017 13:49:08 +0200 Johan Hovold johan@xxxxxxxxxx wrote: >On Wed, Jul 19, 2017 at 01:58:30PM +0200, Anatolij Gustschin wrote: >> On Mon, 10 Jul 2017 14:52:10 +0200 >> Johan Hovold johan@xxxxxxxxxx wrote: >> >> >On Thu, Jul 06, 2017 at 10:49:16PM +0200, Anatolij Gustschin wrote: >> >> Add USB part with common functions for USB-GPIO/I2C/SPI master >> >> adapters. These allow communication with chip's control, transmit >> >> and receive endpoints and will be used by various FT232H drivers. >> > >> >> +static const struct mfd_cell ftdi_cells[] = { >> >> + { .name = "ftdi-cbus-gpio", }, >> >> + { .name = "ftdi-mpsse-i2c", }, >> >> + { .name = "ftdi-mpsse-spi", }, >> >> + { .name = "ftdi-fifo-fpp-mgr", }, >> >> +}; >> > >> >Correct me if I'm wrong, but aren't these modes really mutually >> >exclusive, possibly with exception of cbus-gpio (some pins are at least >> >available as GPIOs in MPSSE mode)? Then MFD is not is not the right fit >> >here either. >> >> MPSSE and FIFO modes are mutually exclusive, but I'm not sure about >> MPSSE and CBUS-GPIO. CBUS-GPIO didn't work as expected when I was >> testing with MPSSE SPI master driver, but maybe it is a driver issue. > >Yes, that wasn't clear to me either from just looking at the data >sheets. MPSSE seems to deal with its GPIOs differently. yes, the GPIOs are at different pins in MPSSE mode and these pins are controlled via writes/reads to/from bulk endpoint with MPSSE commands. >> FT245 FIFO and CBUS GPIO can be switched by a control request, when >> FIFO mode is configured in the EEPROM. > >Since the set_bitmode command is used to control the CBUS gpios, does >that mean that they cannot be toggled independently while FIFO mode is >in use (as the same command is used to set FIFO mode)? yes. Thanks, Anatolij -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html