linux-kernel - Re: [PATCH V3] tty: serial: bcm63xx: use more precise Kconfig symbol

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Date:   Fri, 11 Mar 2022 10:43:12 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Rafał Miłecki <zajec5@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH V3] tty: serial: bcm63xx: use more precise Kconfig symbol

Hi Rafał,

On Fri, Mar 11, 2022 at 10:32 AM Rafał Miłecki <zajec5@...il.com> wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
>
> Patches lowering SERIAL_BCM63XX dependencies led to a discussion and
> documentation change regarding "depends" usage. Adjust Kconfig entry to
> match current guidelines. Make this symbol available for relevant
> architectures only.
>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Ref: f35a07f92616 ("tty: serial: bcm63xx: lower driver dependencies")
> Ref: 18084e435ff6 ("Documentation/kbuild: Document platform dependency practises")
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> ---
> V2: Use precise "depends" (exact platforms)
> V3: Don't default y for COMPILE_TEST

Thanks for the update!

> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -1100,7 +1100,8 @@ config SERIAL_TIMBERDALE
>  config SERIAL_BCM63XX
>         tristate "Broadcom BCM63xx/BCM33xx UART support"
>         select SERIAL_CORE
> -       depends on COMMON_CLK
> +       depends on ARCH_BCM4908 || ARCH_BCM_63XX || BCM63XX || BMIPS_GENERIC || COMPILE_TEST
> +       default ARCH_BCM4908 || ARCH_BCM_63XX || BCM63XX || BMIPS_GENERIC

I'm still not convinced about the default, as it wasn't there before,
hence all existing config files must already have it.
But if the BCM people think it's good to have, I'll shut up ;-)

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

>         help
>           This enables the driver for the onchip UART core found on
>           the following chipsets:

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