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rtc:ds3232/ds3231: Add support to generate 32KHz output

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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>
Reviewed-by: York Sun <yorksun@freescale.com>
This commit is contained in:
Priyanka Jain 2015-06-29 15:39:23 +05:30 • committed by York Sun
parent b7e84c93c4
commit c340941e44
2 changed files with 11 additions and 0 deletions
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10
drivers/rtc/ds3231.c
View file

@ -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

1
include/rtc.h
View file

@ -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