linux-kernel - Re: [PATCH v3] serial: support 16-bit register interface for console

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Message-ID: <562F81BE.3000502@hurleysoftware.com>
Date:	Tue, 27 Oct 2015 09:53:02 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	linux-serial@...r.kernel.org
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Rob Herring <robh@...nel.org>,
	Kevin Cernekee <cernekee@...il.com>, linux-api@...r.kernel.org,
	Jiri Slaby <jslaby@...e.com>, linux-doc@...r.kernel.org,
	Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v3] serial: support 16-bit register interface for console

Hi Masahiro,

On 10/26/2015 12:11 AM, Masahiro Yamada wrote:
> Currently, 8-bit (MMIO) and 32-bit (MMIO32) register interfaces are
> supported for the 8250 console, but the 16-bit (MMIO16) is not.
> The 8250 UART device on my board is connected to a 16-bit bus
> and my main motivation is to use earlycon with it.
> (Refer to arch/arm/boot/dts/uniphier-support-card.dtsi)

As I noted in reviewing v2, the patch hunk below does not apply.
You must rebase your changes on top of Greg's tty-next tree.

Regards,
Peter Hurley

> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> index 603d2cc..325acce 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -1819,8 +1819,8 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
>   *	@options: ptr for <options> field; NULL if not present (out)
>   *
>   *	Decodes earlycon kernel command line parameters of the form
> - *	   earlycon=<name>,io|mmio|mmio32|mmio32be,<addr>,<options>
> - *	   console=<name>,io|mmio|mmio32|mmio32be,<addr>,<options>
> + *	   earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be,<addr>,<options>
> + *	   console=<name>,io|mmio|mmio16|mmio32|mmio32be,<addr>,<options>
>   *
>   *	The optional form
>   *	   earlycon=<name>,0x<addr>,<options>

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