From 27bdb83308301a1dbe3db9e1fbaf6560facda654 Mon Sep 17 00:00:00 2001
From: Andy Gross <agross@kernel.org>
Date: Tue, 24 Apr 2018 13:27:59 -0500
Subject: [PATCH] rtc: Add prescalar configuration option

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>
---
 drivers/rtc/Kconfig.qmsi                      |  8 +++++++
 drivers/rtc/rtc_qmsi.c                        |  2 +-
 include/rtc.h                                 | 23 +------------------
 .../rtc/rtc_basic_api/src/test_rtc_calendar.c |  2 +-
 4 files changed, 11 insertions(+), 24 deletions(-)

diff --git a/drivers/rtc/Kconfig.qmsi b/drivers/rtc/Kconfig.qmsi
index 3be31fdd756..63a7199fbf2 100644
--- a/drivers/rtc/Kconfig.qmsi
+++ b/drivers/rtc/Kconfig.qmsi
@@ -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
diff --git a/drivers/rtc/rtc_qmsi.c b/drivers/rtc/rtc_qmsi.c
index 5ee44659eb8..27f56845acd 100644
--- a/drivers/rtc/rtc_qmsi.c
+++ b/drivers/rtc/rtc_qmsi.c
@@ -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);
diff --git a/include/rtc.h b/include/rtc.h
index 0d1077a404b..ee1a4b5daa6 100644
--- a/include/rtc.h
+++ b/include/rtc.h
@@ -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)
diff --git a/tests/drivers/rtc/rtc_basic_api/src/test_rtc_calendar.c b/tests/drivers/rtc/rtc_basic_api/src/test_rtc_calendar.c
index 9822396606c..7106f4d2e62 100644
--- a/tests/drivers/rtc/rtc_basic_api/src/test_rtc_calendar.c
+++ b/tests/drivers/rtc/rtc_basic_api/src/test_rtc_calendar.c
@@ -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);