ARM: pxa/hx4700: Reduce sleep mode battery discharge by 35%

Drive the two Bluetooth UART output GPIOs (GPIO43_BTUART_TXD, GPIO45_BTUART_RTS)
LOW during sleep mode instead of HIGH. This reduces sleep mode battery discharge
from approximately 46 mA to approximately 30 mA.

Signed-off-by: Oliver Winker <oliver@oli1170.net>
Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>

diff --git a/arch/arm/mach-pxa/hx4700.c b/arch/arm/mach-pxa/hx4700.c
index c5fb105..f49043c 100644 (file)
--- a/arch/arm/mach-pxa/hx4700.c
+++ b/arch/arm/mach-pxa/hx4700.c
@@ -97,9 +97,9 @@ static unsigned long hx4700_pin_config[] __initdata = {
 
        /* BTUART */
        GPIO42_BTUART_RXD,
-       GPIO43_BTUART_TXD,
+       GPIO43_BTUART_TXD_LPM_LOW,
        GPIO44_BTUART_CTS,
-       GPIO45_BTUART_RTS,
+       GPIO45_BTUART_RTS_LPM_LOW,
 
        /* PWM 1 (Backlight) */
        GPIO17_PWM1_OUT,

diff --git a/arch/arm/mach-pxa/include/mach/mfp-pxa27x.h b/arch/arm/mach-pxa/include/mach/mfp-pxa27x.h
index ec0f0b0..a658672 100644 (file)
--- a/arch/arm/mach-pxa/include/mach/mfp-pxa27x.h
+++ b/arch/arm/mach-pxa/include/mach/mfp-pxa27x.h
@@ -158,7 +158,9 @@
 #define GPIO44_BTUART_CTS      MFP_CFG_IN(GPIO44, AF1)
 #define GPIO42_BTUART_RXD      MFP_CFG_IN(GPIO42, AF1)
 #define GPIO45_BTUART_RTS      MFP_CFG_OUT(GPIO45, AF2, DRIVE_HIGH)
+#define GPIO45_BTUART_RTS_LPM_LOW      MFP_CFG_OUT(GPIO45, AF2, DRIVE_LOW)
 #define GPIO43_BTUART_TXD      MFP_CFG_OUT(GPIO43, AF2, DRIVE_HIGH)
+#define GPIO43_BTUART_TXD_LPM_LOW      MFP_CFG_OUT(GPIO43, AF2, DRIVE_LOW)
 
 /* STUART */
 #define GPIO46_STUART_RXD      MFP_CFG_IN(GPIO46, AF2)