From d8f1087c93b54027514f1dacd3c12a71eb691344 Mon Sep 17 00:00:00 2001 From: Steve Sakoman Date: Thu, 4 Feb 2010 12:26:22 -0800 Subject: [PATCH 35/48] RTC: add support for backup battery recharge --- drivers/rtc/rtc-twl.c | 25 +++++++++++++++++++++++++ 1 files changed, 25 insertions(+), 0 deletions(-) diff --git a/drivers/rtc/rtc-twl.c b/drivers/rtc/rtc-twl.c index c6a83a2..2329b5b 100644 --- a/drivers/rtc/rtc-twl.c +++ b/drivers/rtc/rtc-twl.c @@ -30,6 +30,23 @@ #include +/* + * PM_RECEIVER block register offsets (use TWL4030_MODULE_PM_RECEIVER) + */ +#define REG_BB_CFG 0x12 + +/* PM_RECEIVER BB_CFG bitfields */ +#define BIT_PM_RECEIVER_BB_CFG_BBCHEN 0x10 +#define BIT_PM_RECEIVER_BB_CFG_BBSEL 0x0C +#define BIT_PM_RECEIVER_BB_CFG_BBSEL_2V5 0x00 +#define BIT_PM_RECEIVER_BB_CFG_BBSEL_3V0 0x04 +#define BIT_PM_RECEIVER_BB_CFG_BBSEL_3V1 0x08 +#define BIT_PM_RECEIVER_BB_CFG_BBSEL_3v2 0x0c +#define BIT_PM_RECEIVER_BB_CFG_BBISEL 0x03 +#define BIT_PM_RECEIVER_BB_CFG_BBISEL_25UA 0x00 +#define BIT_PM_RECEIVER_BB_CFG_BBISEL_150UA 0x01 +#define BIT_PM_RECEIVER_BB_CFG_BBISEL_500UA 0x02 +#define BIT_PM_RECEIVER_BB_CFG_BBISEL_1MA 0x03 /* * RTC block register offsets (use TWL_MODULE_RTC) @@ -508,6 +525,14 @@ static int __devinit twl_rtc_probe(struct platform_device *pdev) if (ret < 0) goto out2; + /* enable backup battery charging */ + /* use a conservative 25uA @ 3.1V */ + ret = twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, + BIT_PM_RECEIVER_BB_CFG_BBCHEN | + BIT_PM_RECEIVER_BB_CFG_BBSEL_3V1 | + BIT_PM_RECEIVER_BB_CFG_BBISEL_25UA, + REG_BB_CFG); + return ret; out2: -- 1.6.6.1