Merge https://gitlab.denx.de/u-boot/custodians/u-boot-i2c

[oweals/u-boot.git] / drivers / rtc / ds3231.c

diff --git a/drivers/rtc/ds3231.c b/drivers/rtc/ds3231.c
index ae59cfb8697edb5a33f6c275b7df32c0243808ae..9352ff87a292e98f7b82310dd0f9e923deff4400 100644 (file)
--- a/drivers/rtc/ds3231.c
+++ b/drivers/rtc/ds3231.c
@@ -1,24 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2006
  * Markus Klotzbuecher, mk@denx.de
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
  */
 
 /*
@@ -33,8 +16,6 @@
 #include <rtc.h>
 #include <i2c.h>
 
-#if defined(CONFIG_CMD_DATE)
-
 /*
  * RTC register addresses
  */
@@ -65,6 +46,8 @@
 #define RTC_STAT_BIT_A1F       0x1     /* Alarm 1 flag                 */
 #define RTC_STAT_BIT_A2F       0x2     /* Alarm 2 flag                 */
 #define RTC_STAT_BIT_OSF       0x80    /* Oscillator stop flag         */
+#define RTC_STAT_BIT_BB32KHZ   0x40    /* Battery backed 32KHz Output  */
+#define RTC_STAT_BIT_EN32KHZ   0x8     /* Enable 32KHz Output  */
 
 
 static uchar rtc_read (uchar reg);
@@ -157,6 +140,14 @@ void rtc_reset (void)
        rtc_write (RTC_CTL_REG_ADDR, RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2);
 }
 
+/*
+ * Enable 32KHz output
+ */
+void rtc_enable_32khz_output(void)
+{
+       rtc_write(RTC_STAT_REG_ADDR,
+                 RTC_STAT_BIT_BB32KHZ | RTC_STAT_BIT_EN32KHZ);
+}
 
 /*
  * Helper functions
@@ -173,5 +164,3 @@ static void rtc_write (uchar reg, uchar val)
 {
        i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
 }
-
-#endif