From: Russell King Date: Tue, 24 Jan 2012 09:25:57 +0000 (+0000) Subject: ARM: sa11x0: assabet: ensure that GPIO27 is driven X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=49e01e3fb6efe1b0abfa2d5675f88f07989d621f;p=deliverable%2Flinux.git ARM: sa11x0: assabet: ensure that GPIO27 is driven GPIO27 is just connected to a CPLD input without any pull-ups or pull- downs. If GPIO27 is left as an input, it will float around mid-supply, which for CMOS inputs is the worst place for a pin to be. Ensure that this pin is driven. Signed-off-by: Russell King --- diff --git a/arch/arm/mach-sa1100/assabet.c b/arch/arm/mach-sa1100/assabet.c index 6356896587bf..e3805d4c052a 100644 --- a/arch/arm/mach-sa1100/assabet.c +++ b/arch/arm/mach-sa1100/assabet.c @@ -214,6 +214,14 @@ static void __init assabet_init(void) GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM; GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM; + /* + * Also set GPIO27 as an output; this is used to clock UART3 + * via the FPGA and as otherwise has no pullups or pulldowns, + * so stop it floating. + */ + GPCR = GPIO_GPIO27; + GPDR |= GPIO_GPIO27; + /* * Set up registers for sleep mode. */