linux-kernel - Re: [PATCH] tty: serial: amba-pl011: added RS485 support

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Date:   Fri, 17 Jan 2020 01:31:48 +0100
From:   "Ivan Sistik - 3K Solutions, s. r. o." <sistik@...olutions.sk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Russell King <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Eric Anholt <eric@...olt.net>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Jiri Slaby <jslaby@...e.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH] tty: serial: amba-pl011: added RS485 support

On 7. 1. 2020 at 8:27 Greg Kroah-Hartman wrote:

>> +config SERIAL_AMBA_PL011_SOFT_RS485
>> +	bool "RS485 software direction switching for ARM AMBA PL011 serial"
>> +	depends on SERIAL_AMBA_PL011=y
> 
> Why "=y" here?  Shouldn't this just read:
> 	depends on SERIAL_AMBA_PL011?
> 
>> +	select SERIAL_CORE
> 
> Is this needed?  SERIAL_AMBA_PL011 already selects this.

I am not sure. I found this few lines above:

> config SERIAL_AMBA_PL010_CONSOLE
> 	bool "Support for console on AMBA serial port"
> 	depends on SERIAL_AMBA_PL010=y
> 	select SERIAL_CORE_CONSOLE

and modified it for my purpose.


Thanks,

Ivan