linux-kernel - Re: [PATCH 9/9] ARM i.MX51 babbage: Add framebuffer support

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Message-ID: <20101213114332.GF6017@pengutronix.de>
Date:	Mon, 13 Dec 2010 12:43:32 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Liu Ying <liu.y.victor@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org,
	Zhang Lily-R58066 <r58066@...escale.com>,
	Arnaud Patard <arnaud.patard@...-net.org>
Subject: Re: [PATCH 9/9] ARM i.MX51 babbage: Add framebuffer support

On Sun, Dec 12, 2010 at 09:37:38AM +0800, Liu Ying wrote:
> Hello, Sascha,
> 
> I have following 3 comments to this patch:
> 1) I think DISP1_DATx pins need not be set specially, as they keep the
> default register values.

We do not want to depend on default register values in the Linux Kernel.

> 2) Please define 'MX51_PAD_DI_GP4__IPU_DI2_PIN15' in
> arch/arm/plat-mxc/include/mach/iomux-mx51.h, and rename the pin to be
> 'MX51_PAD_DI_GP4__DI2_PIN15', as we name it according to the MX51
> iomux reference manual.

I'm not sure. Normally it's good practice to code the unit into the
name. Otherwise we end up with names like MX51_PAD_xyz__TX which could
be the tx pin of just about any unit.


> 3) It is better to exchange the following two lines or just remove the
> first line:
> +       gpio_set_value(GPIO_DVI_RESET, 0);
> +       gpio_direction_output(GPIO_DVI_RESET, 0);

ok.

Sascha


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