linux-kernel - Re: [PATCH] ARM: EXYNOS: Consolidate multiple low-level UART port definitions

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Message-ID: <CAOesGMgt=zvPM7WoHn4VcUkw28j7+HDUvU2n3hNojx7Nr5PqJQ@mail.gmail.com>
Date:	Thu, 30 May 2013 14:11:31 -0700
From:	Olof Johansson <olof@...om.net>
To:	Tushar Behera <tushar.behera@...aro.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
	Patch Tracking <patches@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>
Subject: Re: [PATCH] ARM: EXYNOS: Consolidate multiple low-level UART port definitions

Hi,

On Wed, May 29, 2013 at 9:40 PM, Tushar Behera <tushar.behera@...aro.org> wrote:
> There are two definitions for low-level UART ports for Exynos platform.
> CONFIG_S3C_LOWLEVEL_UART_PORT is used for printing "Uncompressing
> Linux... done, booting the kernel." and CONFIG_S3C_UART for other
> low-level messages.
>
> The assumption for both the uart ports is that they are pre-configured
> in the bootloader. Since they are essentially the same always, it
> would be good to consolidate them to use only one macro, in this case
> 'DEBUG_S3C_UART' would be a better option.
>
> 'DEBUG_S3C_UART' is defined only if DEBUG_LL is enabled. We can safely
> disable this option when DEBUG_LL is not defined and we can boot various
> boards with different UART port settings. Only drawback of this
> approach is that when DEBUG_LL is not defined, we would be missing the
> print "Uncompressing Linux... done, booting the kernel."
>
> Since CONFIG_S3C_LOWLEVEL_UART_PORT is still used by other Samsung
> boards, the consolidation applies only for ARCH_EXYNOS.
>
> Signed-off-by: Tushar Behera <tushar.behera@...aro.org>

This looks reasonable, but you have to convert the other samsung
platforms too -- it's not ok to ignore them.


-Olof
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