linux-kernel - Re: [PATCH] tty: serial: fsl_lpuart: select SERIAL_FSL_LPUART for SERIAL_FSL_LPUART

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Date:   Sat, 25 Feb 2023 10:03:38 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Tom Rix <trix@...hat.com>, gregkh@...uxfoundation.org,
        jirislaby@...nel.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty: serial: fsl_lpuart: select SERIAL_FSL_LPUART for
 SERIAL_FSL_LPUART_CONSOLE



On 2/25/23 09:51, Tom Rix wrote:
> 
> On 2/25/23 9:46 AM, Randy Dunlap wrote:
>> Hi--
>>
>> On 2/25/23 09:39, Tom Rix wrote:
>>> A rand config causes this link error
>>> ld: drivers/tty/serial/earlycon.o: in function `parse_options':
>>> drivers/tty/serial/earlycon.c:99: undefined reference to `uart_parse_earlycon'
>>>
>>> The rand config has
>>> CONFIG_SERIAL_CORE=m
>>> CONFIG_SERIAL_EARLYCON=y
>>> CONFIG_SERIAL_FSL_LPUART=m
>>> CONFIG_SERIAL_FSL_LPUART_CONSOLE=y
>>>
>>> SERIAL_FSL_LPUART should have been selected instead of depends on-ed.
>>>
>>> Signed-off-by: Tom Rix <trix@...hat.com>
>>> ---
>>>   drivers/tty/serial/Kconfig | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
>>> index 625358f44419..b24d74d389fc 100644
>>> --- a/drivers/tty/serial/Kconfig
>>> +++ b/drivers/tty/serial/Kconfig
>>> @@ -1313,7 +1313,7 @@ config SERIAL_FSL_LPUART
>>>     config SERIAL_FSL_LPUART_CONSOLE
>>>       bool "Console on Freescale lpuart serial port"
>>> -    depends on SERIAL_FSL_LPUART
>>> +    select SERIAL_FSL_LPUART
>> Most other _CONSOLE Kconfig have:
>>
>>     depends on SERIAL_FSL_LPUART=y
> 
> commit 5779a072c248db7a40cfd0f5ea958097fd1d9a30 removed the =y. so it could be built as a module.
> 

uh. But it's still a bool, not a tristate. How does that work?

> 
>>
>> e.g.
>>
>> but I noticed a few others with a similar problem.
>>
>>>       select SERIAL_CORE_CONSOLE
>>>       select SERIAL_EARLYCON
>>>       help
> 

-- 
~Randy