linux-kernel - Re: [PATCH] pinctrl: armada-37xx: Add edge both type gpio irq support

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Message-ID: <CACRpkdbqjh5U5QoE_B+7GfSyDdHW-NCAvogGq-2n8j6L6nG-Gw@mail.gmail.com>
Date:   Tue, 31 Oct 2017 13:07:56 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:     "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Miquèl Raynal <miquel.raynal@...e-electrons.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Victor Gu <xigu@...vell.com>, Marcin Wojtas <mw@...ihalf.com>,
        Wilson Ding <dingwei@...vell.com>,
        Hua Jing <jinghua@...vell.com>,
        Neta Zur Hershkovits <neta@...vell.com>,
        Ken Ma <make@...vell.com>
Subject: Re: [PATCH] pinctrl: armada-37xx: Add edge both type gpio irq support

On Thu, Oct 19, 2017 at 3:10 PM, Gregory CLEMENT
<gregory.clement@...e-electrons.com> wrote:

> From: Ken Ma <make@...vell.com>
>
> 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 <make@...vell.com>
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>

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