linux-kernel - Re: [RFC 10/32] i2c: Kconfig: add HAS

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Date:   Tue, 28 Dec 2021 11:21:59 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        John Garry <john.garry@...wei.com>,
        Nick Hu <nickhu@...estech.com>,
        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-csky@...r.kernel.org, Linux I2C <linux-i2c@...r.kernel.org>
Subject: Re: [RFC 10/32] i2c: Kconfig: add HAS_IOPORT dependencies

Hi Niklas,

On Mon, Dec 27, 2021 at 5:49 PM Niklas Schnelle <schnelle@...ux.ibm.com> wrote:
> In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
> not being declared. We thus need to add HAS_IOPORT as dependency for
> those drivers using them.
>
> Co-developed-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>

Thanks for your patch!

> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -828,6 +828,7 @@ config I2C_NPCM7XX
>
>  config I2C_OCORES
>         tristate "OpenCores I2C Controller"
> +       depends on HAS_IOPORT

While drivers/i2c/busses/i2c-ocores.c does use {in,out}(), I doubt this
is used to access legacy I/O space.

>         help
>           If you say yes to this option, support will be included for the
>           OpenCores I2C controller. For details see
> @@ -1227,6 +1228,7 @@ config I2C_CP2615
>  config I2C_PARPORT
>         tristate "Parallel port adapter"
>         depends on PARPORT
> +       depends on HAS_IOPORT

Same as PRINTER: shouldn't this work with all parport drivers?

>         select I2C_ALGOBIT
>         select I2C_SMBUS
>         help

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds