mirror of
https://git.yoctoproject.org/meta-ti
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Koen Kooi
56 lines
1.7 KiB
Diff
56 lines
1.7 KiB
Diff
From ae08111e55d17183382dd06d161066adf9f80f3c Mon Sep 17 00:00:00 2001
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From: Steve Sakoman <steve@sakoman.com>
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Date: Thu, 4 Feb 2010 12:26:22 -0800
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Subject: [PATCH 25/28] RTC: add support for backup battery recharge
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---
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drivers/rtc/rtc-twl.c | 25 +++++++++++++++++++++++++
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1 files changed, 25 insertions(+), 0 deletions(-)
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diff --git a/drivers/rtc/rtc-twl.c b/drivers/rtc/rtc-twl.c
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index ed1b868..33a8598 100644
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--- a/drivers/rtc/rtc-twl.c
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+++ b/drivers/rtc/rtc-twl.c
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@@ -30,6 +30,23 @@
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#include <linux/i2c/twl.h>
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+/*
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+ * PM_RECEIVER block register offsets (use TWL4030_MODULE_PM_RECEIVER)
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+ */
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+#define REG_BB_CFG 0x12
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+
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+/* PM_RECEIVER BB_CFG bitfields */
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+#define BIT_PM_RECEIVER_BB_CFG_BBCHEN 0x10
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+#define BIT_PM_RECEIVER_BB_CFG_BBSEL 0x0C
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+#define BIT_PM_RECEIVER_BB_CFG_BBSEL_2V5 0x00
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+#define BIT_PM_RECEIVER_BB_CFG_BBSEL_3V0 0x04
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+#define BIT_PM_RECEIVER_BB_CFG_BBSEL_3V1 0x08
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+#define BIT_PM_RECEIVER_BB_CFG_BBSEL_3v2 0x0c
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+#define BIT_PM_RECEIVER_BB_CFG_BBISEL 0x03
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+#define BIT_PM_RECEIVER_BB_CFG_BBISEL_25UA 0x00
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+#define BIT_PM_RECEIVER_BB_CFG_BBISEL_150UA 0x01
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+#define BIT_PM_RECEIVER_BB_CFG_BBISEL_500UA 0x02
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+#define BIT_PM_RECEIVER_BB_CFG_BBISEL_1MA 0x03
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/*
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* RTC block register offsets (use TWL_MODULE_RTC)
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@@ -508,6 +525,14 @@ static int __devinit twl_rtc_probe(struct platform_device *pdev)
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if (ret < 0)
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goto out2;
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+ /* enable backup battery charging */
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+ /* use a conservative 25uA @ 3.1V */
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+ ret = twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
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+ BIT_PM_RECEIVER_BB_CFG_BBCHEN |
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+ BIT_PM_RECEIVER_BB_CFG_BBSEL_3V1 |
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+ BIT_PM_RECEIVER_BB_CFG_BBISEL_25UA,
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+ REG_BB_CFG);
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+
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return ret;
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out2:
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--
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1.6.6.1
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