On 10/27/2017 01:36 PM, Robert Nelson wrote:
On Fri, Oct 27, 2017 at 1:32 PM, Robert Nelson <[email protected]> wrote:
On Fri, Oct 27, 2017 at 1:27 PM, Robert Nelson <[email protected]> wrote:
Hi John,
On Fri, Oct 27, 2017 at 1:20 PM, John Morris <[email protected]> wrote:
To get Beagle GPIOs configured correctly at boot, is a custom overlay the
right way to go? I want a bunch of the PocketBeagle pins configured as GPIO
output low, but some of them start up in other modes with unwanted signals.
So one of the difference between the BBB and the PocketBeagle, we have
'config-pin' built-into the base *.dtb
So if you want a dedicated use of a pin, you need to disable the
config-pin/cape-unversal pinmux:
P1_02_pinmux {
status = "disabled";
};
So this should work:
https://gist.github.com/RobertCNelson/41ed096d96bede9617c0a1adafb24677
OH and Charles wrote another option, i don't think we ever tested it..
https://github.com/RobertCNelson/ti-linux-kernel-dev/blob/ti-linux-4.9.y/patches/drivers/ti/gpio/0008-bone-pinmux-helper-Add-support-for-mode-device-tree-.patch
P1_02_pinmux {
mode = "gpio_pd";
};
it looks silly:
https://gist.github.com/RobertCNelson/41ed096d96bede9617c0a1adafb24677#file-gistfile2-txt
but it should work..
There will still be a little noise from power on -> u-boot -> kernel
(kernel loads in about 1 - 2 seconds)
This works perfectly.
I was originally trying to get the pin configured as output at boot too,
but I was overthinking, since the hal_bb_gpio comp takes care of that.
I gotta say I *love* the PocketBeagle. It fits in a fraction the space
of the BBB, and the option to solder on whichever headers one prefers
helps even more with form factor issues. Brilliant stuff!
John
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github:
https://github.com/machinekit
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