Defining a GPIO in a dts file

Nicola Pace

I am using an AM335x and I want to use GPIO_2_21/22 as gpios. They are multiplexed with the RMII interface. I think should be a simple change in the .dts file, but I don't have enough knowledge of .dts sintax to do it.

Someone could help me ?

Thanks

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi Nicola,

I will forward this to the SW team.

0 Georgi Karpov over 10 years ago

Expert 1185 points

Hi,

if you use am335x-evm.dtb device tree:

1. Generate devicetree.txt for RMII1 (it uses gpio_2), using TI PinMux tool: http://processors.wiki.ti.com/index.php/TI_PinMux_Tool

2. Copy my_rmii_2_pins_default (and ,if need, my_rmii_2_pins_sleep) nodes from devicetree.txt to am33xx_pinmux: pinmux@44e10800 node in am335x-evm.dts (linux/arch/arm/boot/dts);

3. rebuild am335x-evm.dtb

If you use your own dtb, edit it accordingly.

BR,

Georgi

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Defining a GPIO in a dts file