linux-kernel - Re: [PATCHv2 03/11] mxc: Fix Drive Strength Field in the IOMUX controller

Open Source and information security mailing list archives

Date:	Tue, 2 Feb 2010 22:29:50 -0800
From:	Eric Miao <eric.y.miao@...il.com>
To:	Amit Kucheria <amit.kucheria@...onical.com>
Cc:	List Linux Kernel <linux-kernel@...r.kernel.org>,
	linux@....linux.org.uk, Dinh.Nguyen@...escale.com,
	s.hauer@...gutronix.de, grant.likely@...retlab.ca,
	r.herring@...escale.com, linux-arm-kernel@...ts.infradead.org,
	daniel@...aq.de, bryan.wu@...onical.com, valentin.longchamp@...l.ch
Subject: Re: [PATCHv2 03/11] mxc: Fix Drive Strength Field in the IOMUX 
	controller

On Tue, Feb 2, 2010 at 9:16 PM, Amit Kucheria
<amit.kucheria@...onical.com> wrote:
> i.MX51 defines 4 values:
>
> 00: Low Drive Strength
> 01: Medium Drive Strength
> 10: High Drive Strength
> 11: Max Drive Strength
>
> Signed-off-by: Amit Kucheria <amit.kucheria@...onical.com>
> ---
>  arch/arm/plat-mxc/include/mach/iomux-v3.h |    8 +++++---
>  1 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/plat-mxc/include/mach/iomux-v3.h b/arch/arm/plat-mxc/include/mach/iomux-v3.h
> index 1deda01..f2f73d3 100644
> --- a/arch/arm/plat-mxc/include/mach/iomux-v3.h
> +++ b/arch/arm/plat-mxc/include/mach/iomux-v3.h
> @@ -81,11 +81,13 @@ struct pad_desc {
>
>  #define PAD_CTL_ODE                    (1 << 3)
>
> -#define PAD_CTL_DSE_STANDARD           (0 << 1)
> -#define PAD_CTL_DSE_HIGH               (1 << 1)
> -#define PAD_CTL_DSE_MAX                        (2 << 1)
> +#define PAD_CTL_DSE_LOW                        (0 << 1)
> +#define PAD_CTL_DSE_MED                        (1 << 1)
> +#define PAD_CTL_DSE_HIGH               (2 << 1)
> +#define PAD_CTL_DSE_MAX                        (3 << 1)
>

I'm seeing some changes in recent kernel with introduction of PAD_CTL_DRV_*,
which also affects mx3, think it's a tough problem to keep backward
compatibility
now, one way out is to introduce maybe PAD_CTL_DRV_EXTREME specifically
for imx51.

>  #define PAD_CTL_SRE_FAST               (1 << 0)
> +#define PAD_CTL_SRE_SLOW               (0 << 0)
>
>  /*
>  * setups a single pad in the iomuxer
> --
> 1.6.3.3
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
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