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rtc: Add prescalar configuration option

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This patch adds a prescaler configuration option that denotes the
number of RTC ticks per second.  This is used to calculate the value
for 1 second.

Signed-off-by: Andy Gross <agross@kernel.org>
This commit is contained in:
Andy Gross 2018-04-24 13:27:59 -05:00 committed by Kumar Gala
parent 4aaaccc739
commit 27bdb83308
4 changed files with 11 additions and 24 deletions
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8
drivers/rtc/Kconfig.qmsi
View File

@ -18,4 +18,12 @@ config RTC_QMSI_API_REENTRANCY
default n
help
Enable support for RTC shim driver API reentrancy.
config RTC_PRESCALER
int
default 1
prompt "Prescaler size"
help
RTC prescaler used to determine ticks per second
endif

2
drivers/rtc/rtc_qmsi.c
View File

@ -93,7 +93,7 @@ static int rtc_qmsi_set_config(struct device *dev, struct rtc_config *cfg)
* values defined by clk_rtc_div and by QMSI's clk_rtc_div_t match for
* both D2000 and SE.
*/
qm_cfg.prescaler = (clk_rtc_div_t)RTC_DIVIDER;
qm_cfg.prescaler = (clk_rtc_div_t)CONFIG_RTC_PRESCALER;
if (IS_ENABLED(CONFIG_RTC_QMSI_API_REENTRANCY)) {
k_sem_take(RP_GET(dev), K_FOREVER);

23
include/rtc.h
View File

@ -14,29 +14,8 @@
extern "C" {
#endif
enum clk_rtc_div {
RTC_CLK_DIV_1,
RTC_CLK_DIV_2,
RTC_CLK_DIV_4,
RTC_CLK_DIV_8,
RTC_CLK_DIV_16,
RTC_CLK_DIV_32,
RTC_CLK_DIV_64,
RTC_CLK_DIV_128,
RTC_CLK_DIV_256,
RTC_CLK_DIV_512,
RTC_CLK_DIV_1024,
RTC_CLK_DIV_2048,
RTC_CLK_DIV_4096,
RTC_CLK_DIV_8192,
RTC_CLK_DIV_16384,
RTC_CLK_DIV_32768
};
#define RTC_DIVIDER RTC_CLK_DIV_1
/** Number of RTC ticks in a second */
#define RTC_ALARM_SECOND (32768 / (1UL << RTC_DIVIDER))
#define RTC_ALARM_SECOND (32768 / CONFIG_RTC_PRESCALER)
/** Number of RTC ticks in a minute */
#define RTC_ALARM_MINUTE (RTC_ALARM_SECOND * 60)

2
tests/drivers/rtc/rtc_basic_api/src/test_rtc_calendar.c
View File

@ -42,7 +42,7 @@ static int test_task(void)
k_sleep(2000);
val_2 = rtc_read(rtc);
TC_PRINT("val_1: %u, val_2: %u, delta: %lu:%lu\n",
TC_PRINT("val_1: %u, val_2: %u, delta: %u:%u\n",
val_1, val_2,
(val_2 - val_1) / RTC_ALARM_SECOND,
(val_2 - val_1) % RTC_ALARM_SECOND);