[U-Boot] [PATCH] OMAP3: pandora: enable battery backup capacitor

[U-Boot] [PATCH] OMAP3: pandora: enable battery backup capacitor

[Grazvydas Ignotas]

Pandora has a capacitor connected as backup battery, which allows
retaining RTC for some time while main battery is removed. Enable backup
battery charge function to charge that capacitor.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
---
 board/pandora/pandora.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/board/pandora/pandora.c b/board/pandora/pandora.c
index 75e4330..355e9ea 100644
--- a/board/pandora/pandora.c
+++ b/board/pandora/pandora.c
@@ -37,6 +37,10 @@
 #include <asm/mach-types.h>
 #include "pandora.h"
 
+#define TWL4030_BB_CFG_BBCHEN		(1 << 4)
+#define TWL4030_BB_CFG_BBSEL_3200MV	(3 << 2)
+#define TWL4030_BB_CFG_BBISEL_500UA	2
+
 /*
  * Routine: board_init
  * Description: Early hardware init.
@@ -78,6 +82,11 @@ int misc_init_r(void)
 	writel(GPIO28, &gpio5_base->setdataout);
 	writel(GPIO4, &gpio6_base->setdataout);
 
+	/* Enable battery backup capacitor (3.2V, 0.5mA charge current) */
+	twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
+		TWL4030_BB_CFG_BBCHEN | TWL4030_BB_CFG_BBSEL_3200MV |
+		TWL4030_BB_CFG_BBISEL_500UA, TWL4030_PM_RECEIVER_BB_CFG);
+
 	dieid_num_r();
 
 	return 0;
-- 
1.6.3.3

[U-Boot] [PATCH] OMAP3: pandora: enable battery backup capacitor

[Grazvydas Ignotas]

CCing Sandeep.

On Thu, Apr 29, 2010 at 5:52 PM, Grazvydas Ignotas <notasas@gmail.com> wrote:
> Pandora has a capacitor connected as backup battery, which allows
> retaining RTC for some time while main battery is removed. Enable backup
> battery charge function to charge that capacitor.
>
> Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
> ---
> ?board/pandora/pandora.c | ? ?9 +++++++++
> ?1 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/board/pandora/pandora.c b/board/pandora/pandora.c
> index 75e4330..355e9ea 100644
> --- a/board/pandora/pandora.c
> +++ b/board/pandora/pandora.c
> @@ -37,6 +37,10 @@
> ?#include <asm/mach-types.h>
> ?#include "pandora.h"
>
> +#define TWL4030_BB_CFG_BBCHEN ? ? ? ? ?(1 << 4)
> +#define TWL4030_BB_CFG_BBSEL_3200MV ? ?(3 << 2)
> +#define TWL4030_BB_CFG_BBISEL_500UA ? ?2
> +
> ?/*
> ?* Routine: board_init
> ?* Description: Early hardware init.
> @@ -78,6 +82,11 @@ int misc_init_r(void)
> ? ? ? ?writel(GPIO28, &gpio5_base->setdataout);
> ? ? ? ?writel(GPIO4, &gpio6_base->setdataout);
>
> + ? ? ? /* Enable battery backup capacitor (3.2V, 0.5mA charge current) */
> + ? ? ? twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
> + ? ? ? ? ? ? ? TWL4030_BB_CFG_BBCHEN | TWL4030_BB_CFG_BBSEL_3200MV |
> + ? ? ? ? ? ? ? TWL4030_BB_CFG_BBISEL_500UA, TWL4030_PM_RECEIVER_BB_CFG);
> +
> ? ? ? ?dieid_num_r();
>
> ? ? ? ?return 0;
> --
> 1.6.3.3
>
>

[U-Boot] [PATCH] OMAP3: pandora: enable battery backup capacitor

[Paulraj, Sandeep]

> 
> CCing Sandeep.
> 
> On Thu, Apr 29, 2010 at 5:52 PM, Grazvydas Ignotas <notasas@gmail.com>
> wrote:
> > Pandora has a capacitor connected as backup battery, which allows
> > retaining RTC for some time while main battery is removed. Enable backup
> > battery charge function to charge that capacitor.
> >
> > Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
> > ---
> > ?board/pandora/pandora.c | ? ?9 +++++++++
> > ?1 files changed, 9 insertions(+), 0 deletions(-)
> >

I have pushed this to u-boot-ti/master.

This will be part of my next pull request to Tom

Thanks,
Sandeep