On 5/8/14, 9:35 AM, "Charles Steinkuehler" <char...@steinkuehler.net>
wrote:
>The way these systems are configured, I don't know if you can do what
>you want without generating a custom device tree.
>
>The leds class has a trigger function and can be tied to various GPIO
>pins, but I believe that conflicts with exporting that same GPIO pin.
>
>If anyone knows of a way to do this without requiring customizing a
>device tree to move GPIO pins from /sys/class/gpio to /sys/class/leds/
>entries, or if there's a way to have both for the same pin, I'd love to
>hear it!
Without the benefit of a DT overlay, I think you are stuck with generating
a customized DT. Rather than modifying the existing DT files, perhaps it
would be better to update am335x-boneblack.dts to include a custom DTS
like this:
‹
/include/ ³am33xs.dtsi²
/include/ ³am335x-bone-common.dtsi²
/include/ ³am335x-custom.dtsi²
&am33xx_pinmux {
etc
‹
Now am335x-custom.dtsi can be used to override any previous DT settings.
It would also be possible to add various cape DT to am335x-custom.dtsi.
Unfortunately DTC cannot detect conflicts and these will only be detected
when the kernel boots.
Regards,
John
>
>On 5/8/2014 10:49 AM, Hannes Hörting wrote:
>> Hello John!
>>
>> Thank you!
>> I`m using Debian and also the universal device tree from
>> Charles: https://github.com/cdsteinkuehler/beaglebone-universal-io
>>
>> Not sure if its there also available? I doesnt find an information
>>about
>> heartbeat and cpu for user led on the GPIO.
>>
>> Thank you!
>>
>>
>> Am Mittwoch, 7. Mai 2014 20:58:10 UTC+2 schrieb john3909:
>>>
>>>
>>> On 5/7/14, 11:32 AM, "Hannes Hörting" <fai...@gmail.com <javascript:>>
>>> wrote:
>>>
>>>> Hello!
>>>>
>>>> Can I forward the User Led to the GPIO?
>>>> I want to build my own Expansion Board and need this LED.
>>>>
>>>> OR is this function already connectet to some GPIO?
>>>>
>>>> Thank you!
>>> You can change the GPIO for the User LED by modifying the BBB device
>>>tree.
>>> Look at arch/arm/boot/dts/am335x-bone-common.dtsi
>>>
>>>
>>> Regards,
>>> John
>>>>
>>>> --
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>>>
>>>
>>>
>>
>
>
>--
>Charles Steinkuehler
>char...@steinkuehler.net
>
>--
>For more options, visit http://beagleboard.org/discuss
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