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

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Message-ID: <CAHbNUh27ZZ5UxuLMPvv6weNOSG4XKV9ZRrmTB9F0RvgQxufGDQ@mail.gmail.com>
Date:	Fri, 27 Dec 2013 12:00:20 +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>
Subject: Re: [PATCH] serial: samsung: Remove hard-coded major/minor numbers

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>
>> ---
>>  drivers/tty/serial/samsung.c |    4 ----
>>  1 file changed, 4 deletions(-)
>>
>> diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
>> index c1af04d..9c20543 100644
>> --- a/drivers/tty/serial/samsung.c
>> +++ b/drivers/tty/serial/samsung.c
>> @@ -56,8 +56,6 @@
>>  /* UART name and device definitions */
>>
>>  #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.

> 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.

> greg k-h


Thanks for reviewing.
-- 
Tushar Behera
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