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>
git-mirror · Mar 14, 2012 · cd419cf · cd419cf
1 parent 95a50ca
commit cd419cf
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git 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
@@ -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)