Linux/PROCESSOR-SDK-AM437X: gpio.h does not include standard GPIO kernel functions

Phillip Holtzman

Tool/software: Linux

I am looking for kernel GPIO functions gpio_direction_output() and gpio_set_value(). These are standard Linux functions.

Where are the GPIO functions defined?

over 6 years ago

0 Pavel Botev over 6 years ago

TI__Guru**** 170625 points

Hi Phillip,

Which version of the AM437x PSDK Linux you are using?

Check also if below user guide will answer your questions:

software-dl.ti.com/.../Foundational_Components_Kernel_Drivers.html

Regards,
Pavel

0 Phillip Holtzman over 6 years ago in reply to Pavel Botev

Intellectual 380 points

The version of SDK Linux from the TI web site is ti-processor-sdk-linux-am437x-evm-05.02.00.10
The information in the link you provided is not applicable to the SDK Linux.
<Linux/gpio.h> does not include GPIO kernel functions
<Linux/gpio/driver.h> does not exist
<Linux/gpio/consumer.h> does not exist
Where are the GPIO functions for the AM437x SDK Linux?
or
Are we forced to use ioctl() using the values in <Linux/gpio.h>?

0 RonB over 6 years ago in reply to Phillip Holtzman

TI__Mastermind 30526 points

Phillip,

The code for these functions for AM437x is in drivers/gpio/gpio-omap.c. The functions are mapped from generic to specific impmentations by the driver being registered into the GPIO framework.

I hope this is helpful to you. Thanks for your post.

0 Phillip Holtzman over 6 years ago in reply to RonB

Intellectual 380 points

I don't see a drivers directory. Is this on the AM437x SDK Linux or the x86 host Linux?

What is the root path?

0 Pavel Botev over 6 years ago in reply to Phillip Holtzman

TI__Guru**** 170625 points

Phillip,

This should be in SDK:

ti-processor-sdk-linux-am437x-evm-05.0x/board-support/linux-4.14.x/drivers/gpio/gpio-omap.c

Regards,
Pavel

0 Pavel Botev over 6 years ago in reply to Pavel Botev

TI__Guru**** 170625 points

Phillip,

If you have no more questions related to the subject of the e2e thread, please close/verify/resolve this thread.

Regards,
Pavel

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Linux/PROCESSOR-SDK-AM437X: gpio.h does not include standard GPIO kernel functions