This patch add an implementation of the rtc_enable_32khz_output() that
uses the driver model i2c APIs.
Signed-off-by: Chuanhua Han <chuanhua....@nxp.com>
---
depends on:
- http://patchwork.ozlabs.org/project/uboot/list/?series=118772
- http://patchwork.ozlabs.org/project/uboot/list/?series=117226
Changes in v2:
- No change.
drivers/rtc/Kconfig | 10 ++++++++++
drivers/rtc/ds3231.c | 21 +++++++++++++++++++++
include/rtc.h | 6 ++++++
3 files changed, 37 insertions(+)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index fd0009b..040d241 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -31,6 +31,12 @@ config TPL_DM_RTC
drivers to perform the actual functions. See rtc.h for a
description of the API.
+config RTC_ENABLE_32KHZ_OUTPUT
+ bool "Enable RTC 32Khz output"
+ help
+ Some real-time clocks support the output of 32kHz square waves (such
as ds3231),
+ the config symbol choose Real Time Clock device 32Khz output feature.
+
config RTC_PCF2127
bool "Enable PCF2127 driver"
depends on DM_RTC
@@ -41,6 +47,10 @@ config RTC_PCF2127
has a selectable I2C-bus or SPI-bus, a backup battery switch-over
circuit, a
programmable watchdog function, a timestamp function, and many other
features.
+config DS3231_BUS_NUM
+ hex "I2C bus of the DS3231 device"
+ default 0
+
config RTC_DS1307
bool "Enable DS1307 driver"
depends on DM_RTC
diff --git a/drivers/rtc/ds3231.c b/drivers/rtc/ds3231.c
index 79b026a..dbd77a6 100644
--- a/drivers/rtc/ds3231.c
+++ b/drivers/rtc/ds3231.c
@@ -148,11 +148,13 @@ void rtc_reset (void)
/*
* Enable 32KHz output
*/
+#ifdef CONFIG_RTC_ENABLE_32KHZ_OUTPUT
void rtc_enable_32khz_output(void)
{
rtc_write(RTC_STAT_REG_ADDR,
RTC_STAT_BIT_BB32KHZ | RTC_STAT_BIT_EN32KHZ);
}
+#endif
/*
* Helper functions
@@ -251,6 +253,25 @@ static int ds3231_probe(struct udevice *dev)
return 0;
}
+#ifdef CONFIG_RTC_ENABLE_32KHZ_OUTPUT
+void rtc_enable_32khz_output(void)
+{
+ int ret;
+ struct udevice *dev;
+
+#ifdef CONFIG_DS3231_BUS_NUM
+ ret = i2c_get_chip_for_busnum(CONFIG_DS3231_BUS_NUM,
+ CONFIG_SYS_I2C_RTC_ADDR, 1, &dev);
+#else
+ ret = i2c_get_chip_for_busnum(0, CONFIG_SYS_I2C_RTC_ADDR, 1, &dev);
+#endif
+ if (!ret)
+ dm_i2c_reg_write(dev, RTC_STAT_REG_ADDR,
+ RTC_STAT_BIT_BB32KHZ |
+ RTC_STAT_BIT_EN32KHZ);
+}
+#endif
+
static const struct rtc_ops ds3231_rtc_ops = {
.get = ds3231_rtc_get,
.set = ds3231_rtc_set,
diff --git a/include/rtc.h b/include/rtc.h
index b255bdc..df7de09 100644
--- a/include/rtc.h
+++ b/include/rtc.h
@@ -166,11 +166,17 @@ int rtc_read32(struct udevice *dev, unsigned int reg, u32
*valuep);
*/
int rtc_write32(struct udevice *dev, unsigned int reg, u32 value);
+#ifdef CONFIG_RTC_ENABLE_32KHZ_OUTPUT
+void rtc_enable_32khz_output(void);
+#endif
+
#else
int rtc_get (struct rtc_time *);
int rtc_set (struct rtc_time *);
void rtc_reset (void);
+#ifdef CONFIG_RTC_ENABLE_32KHZ_OUTPUT
void rtc_enable_32khz_output(void);
+#endif
/**
* rtc_read8() - Read an 8-bit register
--
2.9.5
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