linux-kernel - Re: [RFC v2 10/39] gpio: add HAS

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Date:   Sun, 1 May 2022 23:55:31 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     William Breathitt Gray <william.gray@...aro.org>
Cc:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pci@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [RFC v2 10/39] gpio: add HAS_IOPORT dependencies

On Fri, Apr 29, 2022 at 5:37 PM William Breathitt Gray
<william.gray@...aro.org> wrote:
> On Fri, Apr 29, 2022 at 04:46:00PM +0200, Niklas Schnelle wrote:

> > Good question. As far as I can see most (all?) of these have "select
> > ISA_BUS_API" which is "def_bool ISA". Now "config ISA" seems to
> > currently be repeated in architectures and doesn't have an explicit
> > HAS_IOPORT dependency (it maybe should have one). But it does only make
> > sense on architectures with HAS_IOPORT set.
>
> There is such a thing as ISA DMA, but you'll still need to initialize
> the device via the IO Port bus first, so perhaps setting HAS_IOPORT for
> "config ISA" is the right thing to do: all ISA devices are expected to
> communicate in some way via ioport.

Adding that dependency seems like the right solution to me.

Yours,
Linus Walleij