On 16/12/2013 23:44, Otavio Salvador wrote: > The macro allows easy setting in per-pin, as for example: > > ,---- > | imx_iomux_v3_setup_pad(MX6_PAD_NANDF_D1__GPIO_2_1 | MUX_MODE_SION); > `---- > > The IOMUX_CONFIG_SION allows for reading PAD value from PSR register. > > The following quote from the datasheet: > > ,---- > | ... > | 28.4.2.2 GPIO Write Mode > | The programming sequence for driving output signals should be as follows: > | 1. Configure IOMUX to select GPIO mode (Via IOMUXC), also enable SION if > need > | to read loopback pad value through PSR > | 2. Configure GPIO direction register to output (GPIO_GDIR[GDIR] set to 1b). > | 3. Write value to data register (GPIO_DR). > | ... > `---- > > This fixes the gpio_get_value to properly work when a GPIO is set for > output and has no conflicts. > > Thanks for Benoît Thébaudeau <[email protected]>, Fabio > Estevam <[email protected]> and Eric Bénard > <[email protected]> for helping to properly trace this down. > > Signed-off-by: Otavio Salvador <[email protected]> > ---
Applied to u-boot-imx, thanks ! Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: [email protected] ===================================================================== _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
