linux-kernel - Re: [PATCH v2 3/7] tty/serial: convert 8250 to generic earlycon

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Message-ID: <CAL_Jsq+uNunqfsvPNxZLQQ3y1ay_XMZKb4c=HNWvKtwuiZGQ0g@mail.gmail.com>
Date:	Tue, 29 Apr 2014 10:16:27 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Catalin Marinas <catalin.marinas@....com>,
	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 3/7] tty/serial: convert 8250 to generic earlycon

On Mon, Apr 28, 2014 at 9:56 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Mon, Apr 28, 2014 at 4:24 PM, Rob Herring <robherring2@...il.com> wrote:
>> On Sat, Apr 26, 2014 at 1:29 AM, Yinghai Lu <yinghai@...nel.org> wrote:
>>
>> Thanks for finding these. I missed them in my build tests. This should fix them:
>>
>> diff --git a/drivers/tty/serial/8250/8250_early.c
>> b/drivers/tty/serial/8250/8250_early.c
>> index e83c9db..2094c3b 100644
>> --- a/drivers/tty/serial/8250/8250_early.c
>> +++ b/drivers/tty/serial/8250/8250_early.c
>> @@ -156,6 +156,11 @@ static int __init early_serial8250_setup(struct
>> earlycon_device *device,
>>  EARLYCON_DECLARE(uart8250, early_serial8250_setup);
>>  EARLYCON_DECLARE(uart, early_serial8250_setup);
>>
>> +int __init setup_early_serial8250_console(char *cmdline)
>> +{
>> +       return setup_earlycon(cmdline, "uart8250", early_serial8250_setup);
>> +}
>> +
>>  int serial8250_find_port_for_earlycon(void)
>>  {
>>         struct earlycon_device *device = early_device;
>
> that only handle "uart8250,", may need to add more lines to handle "uart,"


That is on purpose because the only 2 users use uart8250. I consider
this a legacy interface and use of "uart" is horrible because there
are lots of uarts which are not 8250.

Rob

>
> +int __init setup_early_serial8250_console(char *cmdline)
> +{
> +       char *options;
> +       options = strstr(cmdline, "uart8250,");
> +       if (options)
> +               return setup_earlycon(cmdline, "uart8250",
> early_serial8250_setup);
> +
> +       options = strstr(cmdline, "uart,");
> +       if (options)
> +              return setup_earlycon(cmdline, "uart", early_serial8250_setup);
> +
> +      return 0;
> +}
> +
>
> Thanks
>
> Yinghai
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