DVI framer (TFP410) power down

GoogleGroups
1

Hi

I would like to power down the DVI framer (TFP410), by setting
GPIO_170 (DVI_PUP) pin low, but I am not sure how to do it.

I have tried the procedure described in the link below, but no luck...
http://groups.google.com/group/beagleboard/msg/c623a16637625685

I did:

cd /sys/class/gpio/
echo 170 > export

-now a "directory" called 'gpio170' should have been made, but isn't.
So I can not take control over the gpio.

Any suggestions on how to power down the TFP410??

Thanks!

2

Hello,

Thu, 20 Aug 2009, Quist wrote:

I have tried the procedure described in the link below, but no luck...
http://groups.google.com/group/beagleboard/msg/c623a16637625685

I did:

cd /sys/class/gpio/
echo 170 > export

-now a "directory" called 'gpio170' should have been made, but isn't.
So I can not take control over the gpio.

There is a reason for that. Look at the kernel source and especially file board-omap3beagle.c. GPIO 170 has already been taken into use there. You should be able take control over the GPIO 170 by tweaking that file.

Someone with some knowledge about DSS/something/whatever might be able to tell how to correctly use .panel_reset_gpio.

3

Hello,

There is a reason for that. Look at the kernel source and especially file
board-omap3beagle.c. GPIO 170 has already been taken into use there. You
should be able take control over the GPIO 170 by tweaking that file.

Okay, I see! I was hoping to be able to power down the TFP410 (to
save some power) with some BASH Shell commends.

Someone with some knowledge about DSS/something/whatever might be able to tell
how to correctly use .panel_reset_gpio.

Suggestions, anyone?