From: Arnd Bergmann <arnd@arndb.de>

The added HAS_IOPORT dependency might not actually be necessary as Geert
points out, but the driver is also only used on one architecture. Sparc
is also a special case here since it converts port numbers into virtual
addresses rather than having them mapped into a particular part of the
__iomem address space, so the difference is actually not important here.

Add a dependency on sparc, but allow compile-testing otherwise, to
make this clearer without anyone having to spend much time modernizing
the driver beyond that.

Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: David S. Miller <davem@davemloft.net>
Link: https://lore.kernel.org/all/CAMuHMdWEx0F=fNei4Bz_JPkuvoaN-+zk08h0i8KnSi_VjO615g@mail.gmail.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/rtc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 05f4b2d66290d..99e674d34823b 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1195,7 +1195,7 @@ config RTC_DRV_MSM6242
 
 config RTC_DRV_BQ4802
 	tristate "TI BQ4802"
-	depends on HAS_IOMEM && HAS_IOPORT
+	depends on SPARC || (HAS_IOMEM && HAS_IOPORT && COMPILE_TEST)
 	help
 	  If you say Y here you will get support for the TI
 	  BQ4802 RTC chip.
-- 
2.39.2

Hi Arnd,

On Wed, Jul 19, 2023 at 3:41 PM Arnd Bergmann <arnd@kernel.org> wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> The added HAS_IOPORT dependency might not actually be necessary as Geert
> points out, but the driver is also only used on one architecture. Sparc
> is also a special case here since it converts port numbers into virtual
> addresses rather than having them mapped into a particular part of the
> __iomem address space, so the difference is actually not important here.
>
> Add a dependency on sparc, but allow compile-testing otherwise, to
> make this clearer without anyone having to spend much time modernizing
> the driver beyond that.
>
> Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Cc: David S. Miller <davem@davemloft.net>
> Link: https://lore.kernel.org/all/CAMuHMdWEx0F=fNei4Bz_JPkuvoaN-+zk08h0i8KnSi_VjO615g@mail.gmail.com/
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Thanks for your patch!

> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -1195,7 +1195,7 @@ config RTC_DRV_MSM6242
>
>  config RTC_DRV_BQ4802
>         tristate "TI BQ4802"
> -       depends on HAS_IOMEM && HAS_IOPORT
> +       depends on SPARC || (HAS_IOMEM && HAS_IOPORT && COMPILE_TEST)

I'd rather just add a line "depends on SPARC || COMPILE_TEST",
which is easier to parse.

>         help
>           If you say Y here you will get support for the TI
>           BQ4802 RTC chip.

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