Handling multiple GPIO controllers in 8xxx GPIO driver

Grant Likely grant.likely at secretlab.ca
Fri Sep 30 03:27:37 EST 2011

On Wed, Sep 28, 2011 at 08:52:30PM +0000, Tabi Timur-B04825 wrote:
> On Tue, Sep 27, 2011 at 1:29 PM, Grant Likely <grant.likely at secretlab.ca> wrote:
> > The solution is to make the gpio driver register as a regular
> > interrupt handler, and not as a chained handler.
> I was wondering about that.
> What exactly is a chained handler?  How is it different from a regular handler?

A chained handler has an expedited path through the interrupt code for
handling it (basically, it skips handling it at the parent controller
and passes through to the child, but it cannot handle multiple chained
children on a single irq input.


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