On Thu, Oct 19, 2017 at 3:10 PM, Gregory CLEMENT
[off-list ref] wrote:

From: Ken Ma <redacted>

Current edge both type gpio irqs which need to swap polarity in each
interrupt are not supported, this patch adds edge both type gpio irq
support.

Signed-off-by: Ken Ma <redacted>
Signed-off-by: Gregory CLEMENT <redacted>

Patch applied.

The discussion here is interesting, it is customary for GPIO drivers
to implement double-edge detection emulation by swapping the
edge detector around like this.

It might be possible to collect some generic information about
this in the Documentation/gpio/driver.txt document.

Yours,
Linus Walleij