From: Stefano Babic <sbabic@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] colibri-vf: Disable pull-up configuration in GPIO pin mux
Date: Wed, 2 Mar 2016 14:48:08 +0100 [thread overview]
Message-ID: <56D6EF18.4070007@denx.de> (raw)
In-Reply-To: <1456302804-3059-1-git-send-email-bhuvanchandra.dv@toradex.com>
On 24/02/2016 09:33, Bhuvanchandra DV wrote:
> During very early boot-ROM execution the pinmux
> configuration isi in Hi-Z state. If pull-up is enabled
> on GPIO pad's there will be a short period of toggle
> from high to low on the IO when GPIO is set low during
> boot. To avoid this glitch, disable pull-up configuration
> in GPIO pinmux.
>
> Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
> ---
> arch/arm/include/asm/arch-vf610/iomux-vf610.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/include/asm/arch-vf610/iomux-vf610.h b/arch/arm/include/asm/arch-vf610/iomux-vf610.h
> index 0e2bd53..a140be0 100644
> --- a/arch/arm/include/asm/arch-vf610/iomux-vf610.h
> +++ b/arch/arm/include/asm/arch-vf610/iomux-vf610.h
> @@ -34,7 +34,7 @@
> PAD_CTL_PUS_22K_UP | PAD_CTL_OBE_IBE_ENABLE)
>
> #define VF610_GPIO_PAD_CTRL (PAD_CTL_SPEED_MED | PAD_CTL_DSE_50ohm | \
> - PAD_CTL_PUS_47K_UP | PAD_CTL_IBE_ENABLE)
> + PAD_CTL_IBE_ENABLE)
>
> #define VF610_DSPI_PAD_CTRL (PAD_CTL_OBE_ENABLE | PAD_CTL_DSE_20ohm | \
> PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_HIGH)
>
As fix, applied to u-boot-imx, thanks !
Best regards,
Stefano Babic
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prev parent reply other threads:[~2016-03-02 13:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-24 8:33 [U-Boot] [PATCH] colibri-vf: Disable pull-up configuration in GPIO pin mux Bhuvanchandra DV
2016-03-02 13:48 ` Stefano Babic [this message]
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