Re: [U-Boot] [PATCH] gpio: mxc_gpio: Fix gpio_get_value() when the GPIO is an output

29 Sep 2013


      Hi Benoît,
On Sun, Sep 29, 2013 at 3:50 PM, Benoît Thébaudeau
benoit.thebaudeau@advansee.com wrote:
...
Can you test again without any GPIO patch, but with SION set for this pin in the
IOMUXC? According to the reference manual, SION not being set in the IOMUXC is
the only reason that would prevent PSR from reading the pin level in GPIO output
mode.
Yes, from the feedback from a colleague the SION bit plays a role here:
"The RM does not describe this clear. The fact should be:
PSR for input, DR for output.
PSR can be for output only when SION bit is set (now PSR = DR). "
Regards,
Fabio Estevam