linux-kernel - Re: [PATCH 4/8] tty/serial: add generic serial earlycon

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Message-ID: <20140324112203.GD3850@arm.com>
Date:	Mon, 24 Mar 2014 11:22:03 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Rob Herring <robherring2@...il.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <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>,
	Russell King <linux@....linux.org.uk>,
	Will Deacon <Will.Deacon@....com>,
	"x86@...nel.org" <x86@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 4/8] tty/serial: add generic serial earlycon

On Fri, Mar 21, 2014 at 09:08:44PM +0000, Rob Herring wrote:
> diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
> new file mode 100644
> index 0000000..241757a
> --- /dev/null
> +++ b/drivers/tty/serial/earlycon.c
[...]
> +static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
> +{
> +	void __iomem *base;
> +#ifdef CONFIG_FIX_EARLYCON_MEM
> +	set_fixmap_nocache(FIX_EARLYCON_MEM_BASE, paddr & PAGE_MASK);
> +	base = (void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
> +	base += paddr & ~PAGE_MASK;
> +#else
> +	base = ioremap_nocache(paddr, size);
> +#endif

Just curious why not set_fixmap_io (and plain ioremap)?

> +static int __init parse_options(struct earlycon_device *device,
> +				char *options)
> +{
[...]
> +	if (port->mapbase)
> +		port->membase = earlycon_map(port->mapbase, 64);

I would move the earlycon_map() call in setup_earlycon() (personal
preference, parse_options() implies just parsing the options rather than
having additional side-effects).

-- 
Catalin
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