recipes-bsp/linux/linux-omap/base/0023-RTC-add-support-for-backup-battery-recharge.patch

   1 From 27f251ad46eeda205c220f89b4f9fbeaf930ae54 Mon Sep 17 00:00:00 2001
   2 From: Steve Sakoman <steve@sakoman.com>
   3 Date: Thu, 4 Feb 2010 12:26:22 -0800
   4 Subject: [PATCH 23/26] RTC: add support for backup battery recharge
   5
   6 ---
   7  drivers/rtc/rtc-twl.c |   25 +++++++++++++++++++++++++
   8  1 files changed, 25 insertions(+), 0 deletions(-)
   9
  10 diff --git a/drivers/rtc/rtc-twl.c b/drivers/rtc/rtc-twl.c
  11 index ed1b868..33a8598 100644
  12 --- a/drivers/rtc/rtc-twl.c
  13 +++ b/drivers/rtc/rtc-twl.c
  14 @@ -30,6 +30,23 @@
  15
  16  #include <linux/i2c/twl.h>
  17
  18 +/*
  19 + * PM_RECEIVER block register offsets (use TWL4030_MODULE_PM_RECEIVER)
  20 + */
  21 +#define REG_BB_CFG     0x12
  22 +
  23 +/* PM_RECEIVER  BB_CFG bitfields */
  24 +#define BIT_PM_RECEIVER_BB_CFG_BBCHEN           0x10
  25 +#define BIT_PM_RECEIVER_BB_CFG_BBSEL            0x0C
  26 +#define BIT_PM_RECEIVER_BB_CFG_BBSEL_2V5        0x00
  27 +#define BIT_PM_RECEIVER_BB_CFG_BBSEL_3V0        0x04
  28 +#define BIT_PM_RECEIVER_BB_CFG_BBSEL_3V1        0x08
  29 +#define BIT_PM_RECEIVER_BB_CFG_BBSEL_3v2        0x0c
  30 +#define BIT_PM_RECEIVER_BB_CFG_BBISEL           0x03
  31 +#define BIT_PM_RECEIVER_BB_CFG_BBISEL_25UA      0x00
  32 +#define BIT_PM_RECEIVER_BB_CFG_BBISEL_150UA     0x01
  33 +#define BIT_PM_RECEIVER_BB_CFG_BBISEL_500UA     0x02
  34 +#define BIT_PM_RECEIVER_BB_CFG_BBISEL_1MA       0x03
  35
  36  /*
  37   * RTC block register offsets (use TWL_MODULE_RTC)
  38 @@ -508,6 +525,14 @@ static int __devinit twl_rtc_probe(struct platform_device *pdev)
  39         if (ret < 0)
  40                 goto out2;
  41
  42 +       /* enable backup battery charging */
  43 +       /* use a conservative 25uA @ 3.1V */
  44 +       ret = twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
  45 +               BIT_PM_RECEIVER_BB_CFG_BBCHEN |
  46 +               BIT_PM_RECEIVER_BB_CFG_BBSEL_3V1 |
  47 +               BIT_PM_RECEIVER_BB_CFG_BBISEL_25UA,
  48 +               REG_BB_CFG);
  49 +
  50         return ret;
  51
  52  out2:
  53 --
  54 1.6.6.1
  55