linux-kernel - Re: [PATCH v1 0/8] gpio: acpi: Make it working

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Date:   Tue, 28 Mar 2017 15:24:59 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Alexandre Courbot <gnurou@...il.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v1 0/8] gpio: acpi: Make it working

On Thu, Mar 23, 2017 at 8:46 PM, Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:

> Currently GPIO ACPI library provides an API to get a GPIO resources
> (IO or interrupt) from ACPI tables for the individual drivers.
>
> This library has few flaws which makes some devices not working:
>  - the library allows to abuse ACPI by using a _CRS fallback mechanism
>  - the library neglects flags of the resource
>
> In this series:
>  - the _CRS fallback is forbidden
>  - the pin configuration follows what firmware wants to
>  - the documentation is updated in order to clarify corner cases
>
> After this series it's possible to use GPIO pins for input (interrupt)
> which were configured as output by BIOS by some reason. It's a crucial
> functionality for IoT open connected boards where user may choose any of
> available pin for almost any of available function, including GPIO input
> (interrupt).
>
> Current bad behaviour was first reported by Jarkko Nikula few months ago.

I see there are some outstanding comments in the patches but it looks
OK overall to me, waiting for a v2 before applying, please collect ACKs
and relevant Tested-by:s.

Yours,
Linus Walleij