topic Accessing GPIO in QorIQ u-boot in T-Series

Accessing GPIO in QorIQ u-boot

kylevonschmacht — Mon, 16 Oct 2017 21:02:24 GMT

To whom it may concern,

We're using a custom board using the T2081, derived from the T2080RDB and the T1042RDB.

We find ourselves needing to use a GPIO during the u-boot phase.

To that end:

-What do we need to include in the build?

-What configurations and #define are needed?

-What custom code do we need to generate to fill in the gaps?

Thanks for your help,

Kyle

Re: Accessing GPIO in QorIQ u-boot

Pavel — Wed, 18 Oct 2017 11:18:46 GMT

There is no GPIO driver in u-boot for QorIQ processors, but u-boot driver structure is relatively simple, so you can create your own GPIO driver using other GPIO drivers as reference. For example drivers please look /drivers/gpio/ folder in U-boot sources folder.

Use as example the mpc85xxx_gpio.c file.

Have a great day,
Pavel Chubakov

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