linux-kernel - Re: [PATCH 2/2] serial: 8250_ingenic: allow to be independent of SERIAL_8250

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Date:	Tue, 27 Oct 2015 10:20:06 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	linux-serial@...r.kernel.org
Cc:	Paul Burton <paul.burton@...tec.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Jiri Slaby <jslaby@...e.com>, Alan Cox <alan@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Joachim Eastwood <manabian@...il.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	John Crispin <blogic@...nwrt.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH 2/2] serial: 8250_ingenic: allow to be independent of
 SERIAL_8250_CONSOLE

On 10/23/2015 09:31 AM, Masahiro Yamada wrote:
> This UART driver should not depend on the console.  They should be
> orthogonal.
> 
> Surround the earlycon code with CONFIG_SERIAL_EARLYCON conditional
> and rip off "depends on SERIAL_8250_CONSOLE".

Reviewed-by: Peter Hurley <peter@...leysoftware.com>

PS - While reviewing this patch, I noticed another problem in the
Ingenic earlycon; see below.

> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
> 
> Currently, SERIAL_8250_FSL also depends on SERIAL_8250_CONSOLE,
> but I doubt its necessity.
> 
> 
>  drivers/tty/serial/8250/8250_ingenic.c | 2 ++
>  drivers/tty/serial/8250/Kconfig        | 2 +-
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_ingenic.c b/drivers/tty/serial/8250/8250_ingenic.c
> index 7c1e4be..44633ee 100644
> --- a/drivers/tty/serial/8250/8250_ingenic.c
> +++ b/drivers/tty/serial/8250/8250_ingenic.c
> @@ -34,6 +34,7 @@ struct ingenic_uart_data {
>  
>  #define UART_FCR_UME	BIT(4)
>  
> +#ifdef CONFIG_SERIAL_EARLYCON


>  static struct earlycon_device *early_device;

The earlycon setup should not be saving the earlycon_device *;
see early_8250serial_write() for how to deref from console to port.

Regards,
Peter Hurley


>  static uint8_t __init early_in(struct uart_port *port, int offset)
> @@ -126,6 +127,7 @@ OF_EARLYCON_DECLARE(jz4775_uart, "ingenic,jz4775-uart",
>  EARLYCON_DECLARE(jz4780_uart, ingenic_early_console_setup);
>  OF_EARLYCON_DECLARE(jz4780_uart, "ingenic,jz4780-uart",
>  		    ingenic_early_console_setup);
> +#endif /* CONFIG_SERIAL_EARLYCON */
>  
>  static void ingenic_uart_serial_out(struct uart_port *p, int offset, int value)
>  {
> diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
> index 960da95..6f62934 100644
> --- a/drivers/tty/serial/8250/Kconfig
> +++ b/drivers/tty/serial/8250/Kconfig
> @@ -360,7 +360,7 @@ config SERIAL_8250_UNIPHIER
>  
>  config SERIAL_8250_INGENIC
>  	bool "Support for Ingenic SoC serial ports"
> -	depends on SERIAL_8250_CONSOLE && OF_FLATTREE
> +	depends on OF_FLATTREE
>  	select LIBFDT
>  	help
>  	  If you have a system using an Ingenic SoC and wish to make use of
> 

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