drivers: rtc: Add sam0 support to pinctrl

This add support to pinctrl at Atmel sam0 rtc driver. It allows to
define pins to be used for tamper detection.

Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>

drivers/timer/sam0_rtc_timer.c

@@ -20,6 +20,7 @@
 #include <soc.h>
 #include <drivers/clock_control.h>
 #include <drivers/timer/system_timer.h>
+#include <drivers/pinctrl.h>
 #include <sys_clock.h>
 
 /* RTC registers. */
@@ -78,6 +79,9 @@ static volatile uint32_t rtc_counter;
 /* Tick value of the next timeout. */
 static volatile uint32_t rtc_timeout;
 
+PINCTRL_DT_INST_DEFINE(0);
+static const struct pinctrl_dev_config *pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(0);
+
 #endif /* CONFIG_TICKLESS_KERNEL */
 
 /*
@@ -242,6 +246,8 @@ uint32_t sys_clock_cycle_get_32(void)
 
 static int sys_clock_driver_init(const struct device *dev)
 {
+	int retval;
+
 	ARG_UNUSED(dev);
 
 #ifdef MCLK
@@ -258,6 +264,11 @@ static int sys_clock_driver_init(const struct device *dev)
 	}
 #endif
 
+	retval = pinctrl_apply_state(pcfg, PINCTRL_STATE_DEFAULT);
+	if (retval < 0) {
+		return retval;
+	}
+
 	/* Reset module to hardware defaults. */
 	rtc_reset();
 

dts/bindings/rtc/atmel,sam0-rtc.yaml

@@ -5,7 +5,9 @@ description: Atmel SAM0 RTC
 
 compatible: "atmel,sam0-rtc"
 
-include: rtc.yaml
+include:
+    - name: rtc.yaml
+    - name: pinctrl-device.yaml
 
 properties:
     reg: