I don't have time to dig into the full details, but IIRC this has
popped up before. I don't think the gpio-of-helper driver actually
does anything (like setup the pinmux) if you're not actually
_exporting_ any gpios. But I could be wrong...it's been a while since
I crawled through the code.
Oh, and your pinmux settings don't match the comments. If you really
want inputs with the pullup enabled, the value to use is 0x37, *NOT*
0x17. It's important to enable the gpio receive buffer (bit 0x20) or
you won't be able to read the value on the GPIO pin (IIRC it will
always return zero). If you really want outputs and just didn't
update the comments, 0x17 is fine.
On 11/27/2015 2:14 PM, Riley Porter wrote:
> Yes I am running:
>
> *Linux beaglebone 4.1.1-bone10 #1 Tue Jul 7 01:15:35 UTC 2015 armv7l
> GNU/Linux*
>
> I followed your instructions but still am at a loss. I was able to update
> the device tree compiler and the kernel which is now:
>
> *Linux beaglebone 4.1.13-ti-r33 #1 SMP PREEMPT Fri Nov 20 11:00:50 UTC 2015
> armv7l GNU/Linux*
>
> Perhaps describing my exact steps might shed some light on my screw up?
>
>
> *This is the device tree I am testing with:*
>
>
> /*
>> snip for space
>> */
>> /dts-v1/;
>> /plugin/;
>>
>> /{
>> compatible = "ti,beaglebone", "ti,beaglebone-black";
>> part-number = "EBB-GPIO-Example";
>> version = "00A0";
>>
>> fragment@0 {
>> target = <&am33xx_pinmux>;
>>
>>
>> __overlay__ {
>> ebb_example: EBB_GPIO_Example {
>> pinctrl-single,pins = <
>>
>>
>> /*============= Inputs ================*/
>> 0x070 0x17 // P9_11 PINS$28 GPIO0_30 = 30
>> Input Mode7 pullup
>> 0x078 0x17 // P9_12 PINS$30 GPIO1_28 = 60
>> Input Mode7 pullup
>> 0x074 0x17 // P9_13 PINS$29 GPIO0_31 = 31
>> Input Mode7 pullup
>> 0x048 0x17 // P9_14 PINS$18 GPIO1_18 = 50
>> Input Mode7 pullup
>> 0x040 0x17 // P9_15 PINS$16 GPIO1_16 = 48
>> Input Mode7 pullup
>> 0x04c 0x17 // P9_16 PINS$19 GPIO1_19 = 51
>> Input Mode7 pullup
>> 0x15c 0x17 // P9_17 PINS$87 GPIO0_5 = 5
>> Input Mode7 pullup
>> 0x158 0x17 // P9_18 PINS$86 GPIO0_4 = 4
>> Input Mode7 pullup
>>
>> /* OUTPUT GPIO(mode7) 0x07 pulldown, 0x17
>> pullup, 0x?f no pullup/down */
>> /* INPUT GPIO(mode7) 0x27 pulldown, 0x37
>> pullup, 0x?f no pullup/down */
>> >;
>> };
>> };
>> };
>>
>> fragment@1 {
>> target = <&ocp>;
>> __overlay__ {
>> gpio_helper {
>> compatible = "gpio-of-helper";
>> status = "okay";
>> pinctrl-names = "default";
>> pinctrl-0 = <&ebb_example>;
>> };
>> };
>> };
>> };
>
>
>
> I also removed ALL overlays from my system before doing this below.
> Here is my output from slots and a python program to get the pins i wrote:
>
> *root ~/bbb_stuff # **slots*
>
>
>
>
> * 0: PF---- -1 1: PF---- -1 2: PF---- -1 3: PF---- -1 9: P-O-L- 0
> Override Board Name,00A0,Override Manuf,EBB-GPIO-Example*
>
> *root ~/bbb_stuff # ./getpins *
>
>
>
> *==================================================Reading Pinux
> Pins==================================================*
>
>
>
>
>
>
>
>
> *pin 16 (44e10840.0) 00000027 pinctrl-singlepin 18 (44e10848.0) 00000027
> pinctrl-singlepin 19 (44e1084c.0) 00000027 pinctrl-singlepin 28
> (44e10870.0) 00000017 pinctrl-singlepin 29 (44e10874.0) 00000027
> pinctrl-singlepin 30 (44e10878.0) 00000027 pinctrl-singlepin 86
> (44e10958.0) 00000027 pinctrl-singlepin 87 (44e1095c.0) 00000027
> pinctrl-single*
>
> You can clearly see I have requested them all to be 0x17?
>
> *Here are the alias's I am using:*
>
> *pins='cat /sys/kernel/debug/pinctrl/44e10800.pinmux/pins'**slots='cat
> /sys/devices/platform/bone_capemgr/slots'*
>
>
> *This is the command i used to compile the dt.*
> *dtc -O dtb -o EBB-GPIO-Example-00A0.dtbo -b 0 -@ EBB-GPIO-Example.dts*
>
> *This is the command I used to install it:*
> *echo EBB-GPIO-Example-00A0 > "/sys/devices/platform/bone_capemgr/slots"*
>
>
> *This is the dmesg output after installing the overlay:*
>
>
>
>
>
>
> *[ 2629.259630] bone_capemgr bone_capemgr: part_number
> 'EBB-GPIO-Example-00A0', version 'N/A'[ 2629.259679] bone_capemgr
> bone_capemgr: slot #11: override[ 2629.259700] bone_capemgr bone_capemgr:
> Using override eeprom data at slot 11[ 2629.259722] bone_capemgr
> bone_capemgr: slot #11: 'Override Board Name,00A0,Override
> Manuf,EBB-GPIO-Example'[ 2629.271307] gpio-of-helper ocp:gpio_helper:
> ready[ 2629.271555] bone_capemgr bone_capemgr: slot #11: dtbo
> 'EBB-GPIO-Example-00A0.dtbo' loaded; overlay id #0*
>
>
>
> So any help guys would be really appreciated! I am thinking that I must be
> just doing something wrong. Perhaps the example device tree I am using is
> outdated? Would someone be willing to share with me a GPIO device tree
> that works with kernel 4.1? Also I have tried the dt builder online:
>
> http://kilobaser.com/blog/2014-07-28-beaglebone-black-devicetreeoverlay-generator#1gpiodto
>
> But this seems to not work also. Thanks again everyone.
>
>
> Riley
>
> On Thu, Nov 26, 2015 at 2:13 PM, John Syne <[email protected]> wrote:
>
>> That is strange because it seems to be working for everyone else. What is
>> your kernel version?
>>
>> If you are using kernel version 4.1 or higher, then do the following on
>> your BBB
>>
>> git clone https://github.com/RobertCNelson/bb.org-overlays.git
>>
>> Follow the instructions readme.md file. My guess is you don’t have the
>> correct Device Tree Compiler, but this repo will install the correct
>> version.
>>
>> Regards,
>> John
>>
>>
>>
>>
>> On Nov 26, 2015, at 8:35 AM, Riley Porter <[email protected]> wrote:
>>
>> Hey guys,
>>
>> I have been fighting this for a few days now. But it seems to me that no
>> matter what I do I cannot get the pinmux'ing to work when applying overlays
>> in debian. I have tried 7.8 and 8.2 and either is really different.
>>
>> I was looking around to see if I was the only one in this boat and it
>> turns out I found a post on stack exchange that describes my issue
>> perfectly.
>>
>> Unfortunately the "answer" was to install angstrom. I was hoping someone
>> on the list would have some secret answer as to why applying an overlay was
>> not changing the pinmux's?
>>
>> I would very much like to stick with debian but if the answer is go back
>> angstrom I guess I can live with that.
>>
>> Thanks
>>
>> --
>> For more options, visit http://beagleboard.org/discuss
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>>
>> --
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>
--
Charles Steinkuehler
[email protected]
--
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