diff mbox series

[RFC,10/32] i2c: Kconfig: add HAS_IOPORT dependencies

Message ID 20211227164317.4146918-11-schnelle@linux.ibm.com (mailing list archive)
State Not Applicable
Delegated to: Bjorn Helgaas
Headers show
Series Kconfig: Introduce HAS_IOPORT and LEGACY_PCI options | expand

Commit Message

Niklas Schnelle Dec. 27, 2021, 4:42 p.m. UTC 
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@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
---
 drivers/i2c/busses/Kconfig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Comments

Geert Uytterhoeven Dec. 28, 2021, 10:21 a.m. UTC | #1 
Hi Niklas,

On Mon, Dec 27, 2021 at 5:49 PM Niklas Schnelle <schnelle@linux.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@kernel.org>
> Signed-off-by: Arnd Bergmann <arnd@kernel.org>
> Signed-off-by: Niklas Schnelle <schnelle@linux.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@linux-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
Niklas Schnelle Dec. 28, 2021, 12:13 p.m. UTC | #2 
On Tue, 2021-12-28 at 11:21 +0100, Geert Uytterhoeven wrote:
> Hi Niklas,
> 
> On Mon, Dec 27, 2021 at 5:49 PM Niklas Schnelle <schnelle@linux.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@kernel.org>
> > Signed-off-by: Arnd Bergmann <arnd@kernel.org>
> > Signed-off-by: Niklas Schnelle <schnelle@linux.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.

Hmm, it does use i2c->iobase for inb()/outb() but i2c->base for
ioreadXY()/iowriteXY(). And as it gets i2c->iobase from
platform_get_resource(pdev, IORESOURCE_IO, 0) I'd think that is an I/O
resource/space. It does look like some kind of fallback path though,
the IORESOURCE_IO is only looked at if accessing an IORESOURCE_MEM
fails so maybe that should instead be ifdeffed.

> 
> >         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?

Agree, will drop.

> 
> >         select I2C_ALGOBIT
> >         select I2C_SMBUS
> >         help
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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
diff mbox series

Patch

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index a8d6274dc965..55403018784a 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -175,7 +175,7 @@  config I2C_ISMT
 
 config I2C_PIIX4
 	tristate "Intel PIIX4 and compatible (ATI/AMD/Serverworks/Broadcom/SMSC)"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	help
 	  If you say yes to this option, support will be included for the Intel
 	  PIIX4 family of mainboard I2C interfaces.  Specifically, the following
@@ -828,6 +828,7 @@  config I2C_NPCM7XX
 
 config I2C_OCORES
 	tristate "OpenCores I2C Controller"
+	depends on HAS_IOPORT
 	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
 	select I2C_ALGOBIT
 	select I2C_SMBUS
 	help
@@ -1325,6 +1327,7 @@  config I2C_ICY
 config I2C_MLXCPLD
 	tristate "Mellanox I2C driver"
 	depends on X86_64 || COMPILE_TEST
+	depends on HAS_IOPORT
 	help
 	  This exposes the Mellanox platform I2C busses to the linux I2C layer
 	  for X86 based systems.