From: Gavin Schenk <g.schenk@eckelmann.de>
Date: Tue, 26 Mar 2019 12:31:50 +0100
Subject: [PATCH] eag-mx25/board: pcf2127 fixup OSF

---
 arch/arm/boards/eag-mx25/board.c | 46 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/arch/arm/boards/eag-mx25/board.c b/arch/arm/boards/eag-mx25/board.c
index f581454c1a8f..b2ef66a80649 100644
--- a/arch/arm/boards/eag-mx25/board.c
+++ b/arch/arm/boards/eag-mx25/board.c
@@ -11,6 +11,7 @@
 #include <mach/imxfb.h>
 #include <mach/devices-imx25.h>
 #include <gpio.h>
+#include <i2c/i2c.h>
 
 static int imx25_eag_pmic_init(void)
 {
@@ -27,6 +28,51 @@ static int imx25_eag_pmic_init(void)
 }
 late_initcall(imx25_eag_pmic_init);
 
+static int imx25_eag_handle_pcf2127_osf(void)
+{
+	int ret=0;
+	struct i2c_adapter *adapter = NULL;
+	struct i2c_client client;
+	u8 buf[0x1f];
+	u8 value;
+
+	adapter = i2c_get_adapter(0);
+	if (!adapter) {
+		return -ENODEV;
+	}
+
+	client.adapter = adapter;
+	client.addr = 0x51;
+
+	ret = i2c_read_reg(&client, 0x1b, &buf[0], 0x1f);
+	if (ret != 0x1f)
+		return 1;
+
+	// If OSF is not set we are done
+	if( !(buf[0x3] & 0x80) )
+		return 0;
+
+	printf("pcf2127 OSF bit is set\n");
+
+	// Year 1980, RTC must be set by user
+	if( buf[0xa] == 0x80 ){
+		printf("RTC must be set by user in linux\n");
+		return 2;
+	}
+
+	// We hope the time is accurate and reset OSF bit
+	value = buf[0x3];
+	value &=~0x80;
+	ret = i2c_write_reg(&client,0x3,&value,1);
+	if ( ret != 1 ){
+		return 3;
+	}
+
+	printf("pcf2127 OSF bit fixed successfully\n");
+	return 0;
+}
+late_initcall(imx25_eag_handle_pcf2127_osf);
+
 static const iomux_v3_cfg_t imx25_eag_ci4000_lcdc_pins[] = {
 	MX25_PAD_LD0__LD0,
 	MX25_PAD_LD1__LD1,