linux-kernel - Re: [PATCH RFC v2 04/14] drivers: irqchip: add PDC irqdomain for wakeup capable GPIOs

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Date:   Fri, 8 Nov 2019 14:57:05 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Lina Iyer <ilina@...eaurora.org>
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Evan Green <evgreen@...omium.org>, maz@...nel.org,
        LinusW <linus.walleij@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        mkshah@...eaurora.org,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH RFC v2 04/14] drivers: irqchip: add PDC irqdomain for
 wakeup capable GPIOs

Hi,

On Fri, Nov 8, 2019 at 2:16 PM Lina Iyer <ilina@...eaurora.org> wrote:
>
> On Fri, Nov 08 2019 at 14:54 -0700, Lina Iyer wrote:
> >On Fri, Nov 08 2019 at 14:22 -0700, Doug Anderson wrote:
> >>Hi,
> >>
> >>On Fri, Sep 13, 2019 at 3:00 PM Lina Iyer <ilina@...eaurora.org> wrote:
> >>>
> >>>diff --git a/include/linux/soc/qcom/irq.h b/include/linux/soc/qcom/irq.h
> >>>new file mode 100644
> >>>index 0000000..85ac4b6
> >>>--- /dev/null
> >>>+++ b/include/linux/soc/qcom/irq.h
> >>>@@ -0,0 +1,19 @@
> >>>+/* SPDX-License-Identifier: GPL-2.0-only */
> >>>+
> >>>+#ifndef __QCOM_IRQ_H
> >>>+#define __QCOM_IRQ_H
> >>>+
> >>
> >>I happened to be looking at a pile of patches and one of them added:
> >>
> >>+#include <linux/irqdomain.h>
> >>
> >>...right here.  If/when you spin your patch, maybe you should too?  At
> >>the moment the patch I was looking at is at:
> >>
> >>https://android.googlesource.com/kernel/common/+log/refs/heads/android-mainline-tracking
> >>
> >>Specifically:
> >>
> >>https://android.googlesource.com/kernel/common/+/448e2302f82a70f52475b6fc32bbe30301052e6b
> >>
> >>
> >Sure, will take care of it in the next spin.
> >
> Checking for this, it seems like it would not be needed by this header.
> There is nothing in this file that would need that header. It was
> probably a older version that pulled into that tree.
>
> Is there a reason now that you see this need?

>From the note in the commit I found I'd assume that Maulik Shah (who
is CCed here) has history?

...but looking at it, I see that your header file refers to
"IRQ_DOMAIN_FLAG_NONCORE" which is defined in "linux/irqdomain.h".
That means it's good hygiene for you to include the header, right?
Otherwise all your users need to know that they should include the
header themselves, which is a bit ugly.

-Doug