GPIO proper addressing

[lukaszprzeniosl]

Hello there,

For a while now I am trying to configure some GPIO's on the T1040 platform through a DTS file. I have learned recently, that pinmuxing is done in the RCW file, instead of the DTS file, which makes things a little easier to understand now. Still, I think there is some misconception in the GPIO modules numbering. In the datasheet, one can find this table:

While when one looks in the Linux kernel sources, one can find GPIO's numbered not from 1 to 4, but from 0 to 3...

So in the dts file, If I intend to address this physical pin:

Do I refer to GPIO2?

I would appreciate all help.

[Pavel]

You are right, Linux kernel uses own GPIO's numbering.

Attached file contains .dts file from NXP SDK 2.0-1703 for the T1040RDB board.

Look at the following page about using mpc8xxx_gpio.c driver:

https://stackoverflow.com/questions/3458782/how-to-use-mpc8xxx-gpio-c-device-driver

Have a great day,
Pavel Chubakov

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