linux-kernel - Re: [PATCH v2 3/4] ACPI / gpio: Add hogging support

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Message-ID: <CACRpkdYTUy9u0_VWQ6CuriD+__H8EkR_MyarXMFdJ9hbZwYUgw@mail.gmail.com>
Date:   Thu, 20 Oct 2016 14:09:30 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Alexandre Courbot <gnurou@...il.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] ACPI / gpio: Add hogging support

On Thu, Sep 29, 2016 at 3:39 PM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:

> GPIO hogging means that the GPIO controller can "hog" and configure certain
> GPIOs without need for a driver or userspace to do that. This is useful in
> open-connected boards where BIOS cannot possibly know beforehand which
> devices will be connected to the board.
>
> This adds GPIO hogging mechanism to ACPI analogous to Device Tree.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

Overall nice to have the hogs in ACPI too!

Again here my comment is to break out device_property() and fwnode_*
accessing code to a file shared between ACPI and OF.

If it makes sense.

Because the idea was not to invent those abstractions in order to
just use them with ACPI I hope.

The problem is that some of the code seems to be ACPI-specific,
so if it doesn't work out, I'm also OK to keep it like this.

Yours,
Linus Walleij