linux-kernel - Re: [PATCH v4 11/11] serial: 8250

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Date:	Wed, 13 Jan 2016 09:19:53 +0000
From:	Jon Hunter <jonathanh@...dia.com>
To:	Peter Hurley <peter@...leysoftware.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Rob Herring <robh+dt@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	<linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"Kevin Cernekee" <cernekee@...il.com>,
	Sebastian Frias <sf84@...oste.net>,
	"Paul Burton" <paul.burton@...tec.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v4 11/11] serial: 8250_omap: Add omap8250 earlycon


On 12/01/16 19:51, Peter Hurley wrote:
> Wasn't planning on sending this patch just yet, but oh well.
> 
> On 01/12/2016 11:41 AM, Peter Hurley wrote:
>> Add DT earlycon for 8250_omap driver. This boot console is included
>> for kernels built with CONFIG_SERIAL_EARLYCON=y, CONFIG_OF=y,
>> CONFIG_SERIAL_8250_OMAP=y, and CONFIG_OF_EARLY_FLATTREE=y.
>>
>> This boot console is enabled with the command line option "earlycon"
>> (without "=<name>...") when the DT 'stdout-path' property matches a
>> compatible uart. For example,
>>
>> / {
>>    chosen {
>>         stdout-path = "serial0:115200";
>>    };
>>
>>    ....
>>
>>    aliases {
>>         serial0 = &uart0;
>>    };
>>
>>    ....
>>
>>    ocp : ocp {
>>         uart0 : serial@...09000 {
>>              compatible = "ti,omap3-uart";
>>         }
>>    };
>> };
>>
>> Signed-off-by: Peter Hurley <peter@...leysoftware.com>
>> ---
>>  drivers/tty/serial/8250/8250_early.c | 20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>
>> diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
>> index e7cdc0c..d1f6310 100644
>> --- a/drivers/tty/serial/8250/8250_early.c
>> +++ b/drivers/tty/serial/8250/8250_early.c
>> @@ -201,3 +201,23 @@ EARLYCON_DECLARE(rt288x, early_rt288x_setup);
>>  OF_EARLYCON_DECLARE(rt288x, "ralink,rt2880-uart", early_rt288x_setup);
>>  
>>  #endif /* CONFIG_SERIAL_8250_RT288X */
> 
> This patch may not apply because the context is sitting on top of
> unsubmitted code. Sorry.
> 
> Regards,
> Peter Hurley
> 
>> +
>> +#ifdef CONFIG_SERIAL_8250_OMAP
>> +
>> +static int __init early_omap8250_setup(struct earlycon_device *device,
>> +				       const char *options)
>> +{
>> +	struct uart_port *port = &device->port;
>> +
>> +	if (!(device->port.membase || device->port.iobase))
>> +		return -ENODEV;
>> +
>> +	port->regshift = 2;
>> +	device->con->write = early_serial8250_write;
>> +	return 0;
>> +}

I see you did not mean to send this out, but would the above still be
necessary with my patch [0]? I am wondering if with my patch you can
just add the below OF_EARLYCON_DECLARE() for OMAP?

>> +OF_EARLYCON_DECLARE(omap8250, "ti,omap2-uart", early_omap8250_setup);
>> +OF_EARLYCON_DECLARE(omap8250, "ti,omap3-uart", early_omap8250_setup);
>> +OF_EARLYCON_DECLARE(omap8250, "ti,omap4-uart", early_omap8250_setup);
>> +#endif

If so, would it make sense to include my patches [0] and [1] with this
series, or would you prefer that I just rebase on top of this? I see
that you have already made the same change that I made in patch 2 of my
series.

Cheers
Jon

[0] http://marc.info/?l=linux-serial&m=145259482325332&w=2
[1] http://marc.info/?l=linux-serial&m=145259482825342&w=2