linux-kernel - Re: [PATCH] serial: 8250_uniphier: add earlycon support

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Message-ID: <CAK7LNATGWRwitQVNsiFiiojE3JLYdO6DPY74LSbJ3jw4mg6HdQ@mail.gmail.com>
Date:	Thu, 29 Oct 2015 10:49:27 +0900
From:	Masahiro Yamada <yamada.masahiro@...ionext.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	linux-serial@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Jiri Slaby <jslaby@...e.com>
Subject: Re: [PATCH] serial: 8250_uniphier: add earlycon support

Hi Peter,



>>
>> +#if IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE)
>
> #ifdef CONFIG_SERIAL_8250_CONSOLE

I am OK with this change because this CONFIG is boolean.


I still believe

#if IS_ENABLED(CONFIG_FOO)

is a nice shorthand for

#if defined(CONFIG_FOO) || defined(CONFIG_FOO_MODULE)

when CONFIG_FOO is tristate.





>> +static int __init uniphier_early_console_setup(struct earlycon_device *device,
>> +                                            const char *options)
>> +{
>> +     if (!device->port.membase)
>> +             return -ENODEV;
>> +
>> +     /* This hardware always expects MMIO32 register interface. */
>> +     device->port.iotype = UPIO_MEM32;
>> +     device->port.regshift = 2;
>> +
>> +     /*
>> +      * Do not touch the divisor register in early_serial8250_setup();
>> +      * we assume it has been initialized by a boot loader.
>> +      */
>> +     device->baud = 0;
>> +
>> +     return early_serial8250_setup(device, options);
>> +}
>> +OF_EARLYCON_DECLARE(uniphier_uart, "socionext,uniphier-uart",
>> +                 uniphier_early_console_setup);
>
> Please change the earlycon name to just "uniphier" or "uniphier8250"; eg.,
>
> OF_EARLYCON_DECLARE(uniphier, "socionext,uniphier-uart",
>                     uniphier_early_console_setup);
>
>
> My earlycon series merges OF_EARLYCON_DECLARE() => EARLYCON_DECLARE()
> and "uniphier" is simpler on the command line.
>

I am also OK with this change, too.

But I still see  some *_serial and *_uart are used
in EARLYCON_DECLARE.

yamada@...gle:~/workspace/linux/drivers/tty$ git grep -e
'EARLYCON_DECLARE(.*_uart'
serial/8250/8250_ingenic.c:EARLYCON_DECLARE(jz4740_uart,
ingenic_early_console_setup);
serial/8250/8250_ingenic.c:OF_EARLYCON_DECLARE(jz4740_uart,
"ingenic,jz4740-uart",
serial/8250/8250_ingenic.c:EARLYCON_DECLARE(jz4775_uart,
ingenic_early_console_setup);
serial/8250/8250_ingenic.c:OF_EARLYCON_DECLARE(jz4775_uart,
"ingenic,jz4775-uart",
serial/8250/8250_ingenic.c:EARLYCON_DECLARE(jz4780_uart,
ingenic_early_console_setup);
serial/8250/8250_ingenic.c:OF_EARLYCON_DECLARE(jz4780_uart,
"ingenic,jz4780-uart",
serial/arc_uart.c:EARLYCON_DECLARE(arc_uart, arc_early_console_setup);
serial/arc_uart.c:OF_EARLYCON_DECLARE(arc_uart, "snps,arc-uart",
arc_early_console_setup);
serial/bcm63xx_uart.c:OF_EARLYCON_DECLARE(bcm63xx_uart,
"brcm,bcm6345-uart", bcm_early_console_setup);
yamada@...gle:~/workspace/linux/drivers/tty$ git grep -e
'EARLYCON_DECLARE(.*_serial'
serial/8250/8250_early.c:EARLYCON_DECLARE(uart8250, early_serial8250_setup);
serial/8250/8250_early.c:EARLYCON_DECLARE(uart, early_serial8250_setup);
serial/msm_serial.c:EARLYCON_DECLARE(msm_serial,
msm_serial_early_console_setup);
serial/msm_serial.c:OF_EARLYCON_DECLARE(msm_serial, "qcom,msm-uart",
serial/msm_serial.c:EARLYCON_DECLARE(msm_serial_dm,
msm_serial_early_console_setup_dm);
serial/msm_serial.c:OF_EARLYCON_DECLARE(msm_serial_dm, "qcom,msm-uartdm",
serial/sprd_serial.c:EARLYCON_DECLARE(sprd_serial, sprd_early_console_setup);
serial/sprd_serial.c:OF_EARLYCON_DECLARE(sprd_serial, "sprd,sc9836-uart",


-- 
Best Regards
Masahiro Yamada
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