[ARM] 4278/1: configure pxa27x I2C SCL as "input"

It has been reported by Julian Deng that configuring the pxa27x i2c SCL line as output generates a short negative pulse on it during the call to pxa_gpio_mode(GPIO117_I2CSCL_MD); as it first switches it to output and then configures it for the alternate function. The SCL line is in fact bidirectional and can also be configured as 117 | GPIO_ALT_FN_1_IN, in which case the pulse is not generated. This is exactly what this patch does.

Author: Julian Deng <dengtj@sitek.cn>

Signed-off-by: G. Liakhovetski <gl@dsa-ac.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/include/asm-arm/arch-pxa/pxa-regs.h b/include/asm-arm/arch-pxa/pxa-regs.h
index aec835b..139c9d9 100644 (file)
--- a/include/asm-arm/arch-pxa/pxa-regs.h
+++ b/include/asm-arm/arch-pxa/pxa-regs.h
@@ -1476,7 +1476,7 @@
 #define GPIO112_MMCCMD_MD      (112 | GPIO_ALT_FN_1_OUT)
 #define GPIO113_I2S_SYSCLK_MD  (113 | GPIO_ALT_FN_1_OUT)
 #define GPIO113_AC97_RESET_N_MD        (113 | GPIO_ALT_FN_2_OUT)
-#define GPIO117_I2CSCL_MD      (117 | GPIO_ALT_FN_1_OUT)
+#define GPIO117_I2CSCL_MD      (117 | GPIO_ALT_FN_1_IN)
 #define GPIO118_I2CSDA_MD      (118 | GPIO_ALT_FN_1_IN)
 
 /*