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

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Message-ID: <145c66e0-2ba5-712c-57de-82378328ec3f@gmail.com>
Date:   Thu, 10 Mar 2022 09:33:06 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Kevin Cernekee <cernekee@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        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] tty: serial: bcm63xx: use more precise Kconfig symbol

On 10.03.2022 09:19, Geert Uytterhoeven wrote:
> On Thu, Mar 10, 2022 at 8:22 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>
> 
> Thanks for your patch!
> 
>> --- 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 MIPS || ARM || ARM64 || COMPILE_TEST
>> +       default ARCH_BCM4908 || BCM63XX || BMIPS_GENERIC
> 
> So ARCH_BCM4908 covers ARM64, and BCM63XX || BMIPS_GENERIC
> cover MIPS.  Is there some symbol covering ARM so we can change the
> depends to
> 
>      depends on FOO || ARCH_BCM4908 || BCM63XX || BMIPS_GENERIC || COMPILE_TEST
> 
> ?

Florian, Kevin: do you know what other platforms need that driver?

Ref: c0ec3fd123e9 ("tty: serial: bcm63xx: Allow bcm63xx_uart to be built on other platforms")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c0ec3fd123e9e64e095fb221ace841e00c04e40b