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DB3PR05MB265; 5:Blp6PeBcVLZsBB58bgbN9GJInRIAPfxfLE7488kG1KiYIwSGD6cztWK6oXE70TwM1l7wVTxghM0fviqfffce7qjlq3KEQOfgTz4EhKZ6ZlbNnjJHz0SlNIfp31/N7YMhpum3aqe8e4rJvJdrQn6O5g==; 24:WuOHKbNGlLHyg1HIa9ZyV8Ii5YmFEalOSJE0bVpytm4qxnl3BlQn7licBSK3OXV54W2gHdFXJBu6PUgUMXvdESzf/9r80vJPlkJYx10nQMk= SpamDiagnosticOutput: 1:23 SpamDiagnosticMetadata: NSPM X-OriginatorOrg: toradex.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2016 08:33:44.3038 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB3PR05MB265 Cc: u-boot@lists.denx.de Subject: [U-Boot] [PATCH] colibri-vf: Disable pull-up configuration in GPIO pin mux X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.15 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" 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 --- 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)