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

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Add an implementation of the rtc_enable_32khz_output() that uses the
driver model i2c APIs.

Also put code related to rtc_enable_32khz_output
under CONFIG_RTC_ENABLE_32KHZ_OUTPUT.

Signed-off-by: Chuanhua Han <chuanhua.han@nxp.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
This commit is contained in:
Chuanhua Han 2019-07-26 19:24:00 +08:00 committed by Prabhakar Kushwaha
parent 6672ab1628
commit db07c447ca
5 changed files with 32 additions and 0 deletions
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2
board/freescale/ls2080aqds/ls2080aqds.c
View file

@ -225,7 +225,9 @@ int board_init(void)
gd->env_addr = (ulong)&default_environment[0];
#endif
select_i2c_ch_pca9547(I2C_MUX_CH_DEFAULT);
#ifdef CONFIG_RTC_ENABLE_32KHZ_OUTPUT
rtc_enable_32khz_output();
#endif
#ifdef CONFIG_FSL_CAAM
sec_init();
#endif

6
drivers/rtc/Kconfig
View file

@ -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

17
drivers/rtc/ds3231.c
View file

@ -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 +253,21 @@ static int ds3231_probe(struct udevice *dev)
return 0;
}
#ifdef CONFIG_RTC_ENABLE_32KHZ_OUTPUT
int rtc_enable_32khz_output(int busnum, int chip_addr)
{
int ret;
struct udevice *dev;
ret = i2c_get_chip_for_busnum(busnum, chip_addr, 1, &dev);
if (!ret)
ret = dm_i2c_reg_write(dev, RTC_STAT_REG_ADDR,
RTC_STAT_BIT_BB32KHZ |
RTC_STAT_BIT_EN32KHZ);
return ret;
}
#endif
static const struct rtc_ops ds3231_rtc_ops = {
.get = ds3231_rtc_get,
.set = ds3231_rtc_set,

1
include/configs/ls2080aqds.h
View file

@ -325,6 +325,7 @@ unsigned long get_board_ddr_clk(void);
#define RTC
#define CONFIG_RTC_DS3231 1
#define CONFIG_SYS_I2C_RTC_ADDR 0x68
#define CONFIG_RTC_ENABLE_32KHZ_OUTPUT
/* EEPROM */
#define CONFIG_ID_EEPROM

6
include/rtc.h
View file

@ -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
int rtc_enable_32khz_output(int busnum, int chip_addr);
#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