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 <rmk+kernel@arm.linux.org.uk>

1 files changed, 8 insertions, 0 deletions

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
@@ -215,6 +215,14 @@ static void __init assabet_init(void)
         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.
          */
         PWER = PWER_GPIO0;