From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Zheng, Qi" <qi.zheng@intel.com>
Subject: RE: [PATCH 1/3] pinctrl: Intel: add RX invertion config
Date: Mon, 14 Mar 2016 01:10:07 +0000
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On Sat, Mar 12, 2016 at 01:06:00AM +0800, Qipeng Zha wrote:
> Some module need to enable RX invertion config on BXT platform.
> 
> Signed-off-by: Qi Zheng <qi.zheng@intel.com>
> Signed-off-by: Qipeng Zha <qipeng.zha@intel.com>

> Can I ask what module might need this? I'm not so certain we want to add anything like this to the driver to be honest.

The "pi330532" device on Broxton requires this function to manually trigger an GPIO input interrupt.
That is to say, actually no signal change on the pin but toggling this RX inversion bit to make the GPIO controller believes there is voltage change on the pin thus triggering the interrupt.