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List:       linux-rtc
Subject:    [RESEND PATCH v2 1/3] rtc: ds1307: Enable battery backup on RX8130
From:       Bastian Krause <bst () pengutronix ! de>
Date:       2020-04-15 16:36:59
Message-ID: 20200415163701.21989-1-bst () pengutronix ! de
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From: Marek Vasut <marex@denx.de>

The battery backup can be disabled on this RTC, e.g. if populated right
out of production. Force the battery backup bit on to enable it.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Bastian Krause <bst@pengutronix.de>
--
v2: Drop the custom offset, let regmap handle that
---
 drivers/rtc/rtc-ds1307.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 49702942bb08..5f0df60a71d1 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -122,6 +122,8 @@ enum ds_type {
 #define RX8130_REG_FLAG_AF		BIT(3)
 #define RX8130_REG_CONTROL0		0x1e
 #define RX8130_REG_CONTROL0_AIE		BIT(3)
+#define RX8130_REG_CONTROL1		0x1f
+#define RX8130_REG_CONTROL1_INIEN	BIT(4)
 
 #define MCP794XX_REG_CONTROL		0x07
 #	define MCP794XX_BIT_ALM0_EN	0x10
@@ -1875,6 +1877,11 @@ static int ds1307_probe(struct i2c_client *client,
 				     DS1307_REG_HOUR << 4 | 0x08, hour);
 		}
 		break;
+	case rx_8130:
+		/* make sure that the backup battery is enabled */
+		regmap_write(ds1307->regmap, RX8130_REG_CONTROL1,
+			     RX8130_REG_CONTROL1_INIEN);
+		break;
 	default:
 		break;
 	}
-- 
2.26.0.rc2

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