RTC devices can generate 32KHz output if for -DS3232 device, EN32KHz bit and BB32KHz bit are set -DS3231 device, EN32KHz bit is set, BB32KHz bit is don't care

Patch adds rtc_enable_32khz_output() which when called will enable 32KHz output on 32KHz pin

Signed-off-by: Priyanka Jain Priyanka.Jain@freescale.com --- Based on git://git.denx.de/u-boot-fsl-qoriq

drivers/rtc/ds3231.c | 10 ++++++++++ include/rtc.h | 1 + 2 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/rtc/ds3231.c b/drivers/rtc/ds3231.c index c84bbc6..e5e1be1 100644 --- a/drivers/rtc/ds3231.c +++ b/drivers/rtc/ds3231.c @@ -49,6 +49,8 @@ #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); @@ -141,6 +143,14 @@ 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 diff --git a/include/rtc.h b/include/rtc.h index bd8621d..69fe8d4 100644 --- a/include/rtc.h +++ b/include/rtc.h @@ -151,6 +151,7 @@ int rtc_write32(struct udevice *dev, unsigned int reg, u32 value); int rtc_get (struct rtc_time *); int rtc_set (struct rtc_time *); void rtc_reset (void); +void rtc_enable_32khz_output(void);

/** * rtc_read8() - Read an 8-bit register