[PATCH v2] pxa/hx4700: Reduce sleep mode battery discharge by 35%

[Haojian Zhuang]

On Sun, Mar 11, 2012 at 9:23 PM, Paul Parsons <lost.distance at yahoo.com> wrote:
> 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 at oli1170.net>
> Signed-off-by: Paul Parsons <lost.distance at yahoo.com>
> ---
>
> V2:
> Corrected nomenclature.
> Added GPIO43_BTUART_TXD_LPM_LOW and GPIO45_BTUART_RTS_LPM_LOW to mfp-pxa27x.h
>
> diff -uprN clean-3.3-rc6/arch/arm/mach-pxa/hx4700.c linux-3.3-rc6/arch/arm/mach-pxa/hx4700.c
> --- clean-3.3-rc6/arch/arm/mach-pxa/hx4700.c    2012-03-04 01:08:09.000000000 +0000
> +++ linux-3.3-rc6/arch/arm/mach-pxa/hx4700.c    2012-03-11 12:30:29.799567611 +0000
> @@ -97,9 +97,9 @@ static unsigned long hx4700_pin_config[]
>
>        /* 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 -uprN clean-3.3-rc6/arch/arm/mach-pxa/include/mach/mfp-pxa27x.h linux-3.3-rc6/arch/arm/mach-pxa/include/mach/mfp-pxa27x.h
> --- clean-3.3-rc6/arch/arm/mach-pxa/include/mach/mfp-pxa27x.h   2012-03-04 01:08:09.000000000 +0000
> +++ linux-3.3-rc6/arch/arm/mach-pxa/include/mach/mfp-pxa27x.h   2012-03-11 12:32:23.728285708 +0000
> @@ -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)
>
>
Applied