linux-kernel - Re: [PATCH] serial: samsung: Remove hard-coded major/minor numbers

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Date:	Fri, 27 Dec 2013 15:47:31 +0530
From:	Tushar Behera <tushar.behera@...aro.org>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-serial <linux-serial@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>, jslaby <jslaby@...e.cz>,
	Patch Tracking <patches@...aro.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	ben@...tec.co.uk, Thomas Abraham <thomas.abraham@...aro.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	heiko <heiko@...ech.de>, Kgene Kim <kgene.kim@...sung.com>
Subject: Re: [PATCH] serial: samsung: Remove hard-coded major/minor numbers

On 27 December 2013 12:08, Greg KH <gregkh@...uxfoundation.org> wrote:
> On Fri, Dec 27, 2013 at 12:00:20PM +0530, Tushar Behera wrote:
>> On 27 December 2013 10:48, Greg KH <gregkh@...uxfoundation.org> wrote:
>> > On Fri, Dec 27, 2013 at 10:37:28AM +0530, Tushar Behera wrote:

[ ... ]

>> >> @@ -951,8 +949,6 @@ static struct uart_driver s3c24xx_uart_drv = {
>> >>       .nr             = CONFIG_SERIAL_SAMSUNG_UARTS,
>> >>       .cons           = S3C24XX_SERIAL_CONSOLE,
>> >>       .dev_name       = S3C24XX_SERIAL_NAME,
>> >> -     .major          = S3C24XX_SERIAL_MAJOR,
>> >> -     .minor          = S3C24XX_SERIAL_MINOR,
>> >
>> > Doesn't this break existing systems and configurations that are
>> > expecting 204:64 as the location of this serial port?
>> >
>>
>> I tested this on Exynos4210-Origen, Exynos5250-Arndale board, it works
>> fine there. I haven't tested on any older boards.
>
> How did it work?  You are relying on some userspace tools to do this
> properly, right?  What about systems without those specific tools?
>

Enabling CONFIG_DEVTMPFS, all the /dev/ttySAC<n> nodes are generated
and the appropriate console is specified through command line
argument.

>> > Why change this one and not the amba-pl011 driver?
>> >
>>
>> I could only test this driver, so thought of changing this rather than
>> modifying amba-pl011 driver. I don't have any other reason.
>
> Please get the samsung driver maintainer to agree with this and sign off
> on it before trying to get it merged again.
>
> greg k-h

Adding a few other developers who have contributed to this file or are
working on different Samsung platforms to get an ack/sign-off.

-- 
Tushar Behera
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