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

[Eric Bénard]

Hi Benoît,

Le Sun, 29 Sep 2013 15:21:52 +0200 (CEST),
Benoît Thébaudeau <benoit.thebaudeau at advansee.com> a écrit :
> Why is this required? Is it because there is a different behavior of the PSR
> register on one of the i.MXs?
> 
> See my commit message here:
> http://git.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=commitdiff;h=5dafa4543c399d329c7b01df1afa98437861cac0
> 
> In case the registers are configured to output some level on a GPIO but there is
> a level conflict with other hardware, the general assumption about
> gpio_get_value() would probably be that it returns the actual GPIO level, not
> the level that the registers try to apply. For the latter, another function
> accessing DR could be implemented.
> 
you are right and if that works in the kernel, that should also work
in u-boot. It would be interesting to know if the original patch was
really fixing a problem as it would be surprising that setting the pin
as an input could fix the level sampling problem reliably : Otavio was
that tested on real hardware ?

BTW Otavio if you read that email through the ML, your MX server rejects
my emails :
<otavio at ossystems.com.br>: host mx.ossystems.com.br[66.7.219.172] said:
450 4.1.8 <eric at eukrea.com>: Sender address rejected: Domain not found
(in reply to RCPT TO command)

Eric