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

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Date:	Thu, 26 Dec 2013 22:49:24 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Alexander Shiyan <shc_work@...l.ru>
Cc:	Tushar Behera <tushar.behera@...aro.org>,
	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>
Subject: Re: [PATCH] serial: samsung: Remove hard-coded major/minor numbers

On Fri, Dec 27, 2013 at 10:43:23AM +0400, Alexander Shiyan wrote:
> Hello.
> > 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:
> > > >> The hard-coded values clash with the values set for amba-pl011 serial
> > > >> driver. Because of this there is no serial output on Samsung boards
> > > >> if amba-pl011 is enabled alongwith samsung-serial driver.
> > > >>
> > > >> Remove the hardcoded values and let the framework decide on
> > > >> appropriate major/minor number. This is required for multi-platform
> > > >> development work on Exynos platform.
> > > >>
> > > >> Signed-off-by: Tushar Behera <tushar.behera@...aro.org>
> ...
> > > >>  #define S3C24XX_SERIAL_NAME  "ttySAC"
> > > >> -#define S3C24XX_SERIAL_MAJOR 204
> > > >> -#define S3C24XX_SERIAL_MINOR 64
> > > >>
> > > >>  /* macros to change one thing to another */
> > > >>
> > > >> @@ -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?
> 
> Can this issue be resolved by using MODULE_ALIAS_CHARDEV()
> in the driver code?

How exactly would that work?
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