You could start by reading the GPIO docs here:
http://www.mjmwired.net/kernel/Documentation/gpio.txt

Or the SPI stuff here:
http://www.mjmwired.net/kernel/Documentation/spi/spi-summary

After that, try reading up on sysfs, which is the system that allows access
to GPIO and SPI in Linux.

Brandon

On Wed, Apr 8, 2015 at 12:39 AM, Shyam D <[email protected]> wrote:

> I want to understand the GPIO framework of the linux, so i want to have a
> look at the source, but not sure what files would be compiled in the gpio
> folder looking at source , i know i can find it if i compile and see the
> obj folder i may find ,
>
>  please let me know , if there is any file which would convey what files
> of a module lets say GPIO or SPI or any peripheral will be compiled
>
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-- 
Brandon Stafford
Rascal Micro: small computers for art and science
Somerville, MA, USA

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