OMAP3: pandora: enable battery backup capacitor

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> Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

OMAP3: pandora: enable battery backup capacitor
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> Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
Grazvydas Ignotas · Sandeep Paulraj
1 parent 2391174048
Showing 1 changed file with 9 additions and 0 deletions Side-by-side Diff
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.
@@ -77,6 +81,11 @@
 	/* Set GPIOs */
 	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();
...	...	@@ -37,6 +37,10 @@
37	37	#include <asm/mach-types.h>
38	38	#include "pandora.h"
39	39
	40	+#define TWL4030_BB_CFG_BBCHEN (1 << 4)
	41	+#define TWL4030_BB_CFG_BBSEL_3200MV (3 << 2)
	42	+#define TWL4030_BB_CFG_BBISEL_500UA 2
	43	+
40	44	/*
41	45	* Routine: board_init
42	46	* Description: Early hardware init.
...	...	@@ -77,6 +81,11 @@
77	81	/* Set GPIOs */
78	82	writel(GPIO28, &gpio5_base->setdataout);
79	83	writel(GPIO4, &gpio6_base->setdataout);
	84	+
	85	+ /* Enable battery backup capacitor (3.2V, 0.5mA charge current) */
	86	+ twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER,
	87	+ TWL4030_BB_CFG_BBCHEN \| TWL4030_BB_CFG_BBSEL_3200MV \|
	88	+ TWL4030_BB_CFG_BBISEL_500UA, TWL4030_PM_RECEIVER_BB_CFG);
80	89
81	90	dieid_num_r();
82	91