boards: nordic: nrf7120pdk: Add clock sources to GRTC

* Add clock sources to GRTC node
* Disable CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC by default

Signed-off-by: Dhanoo Surasarang <[email protected]>

Author: dhsu-nordic

boards/nordic/nrf7120pdk/board.c

@@ -4,15 +4,22 @@
  * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
  */
 
+#include <zephyr/device.h>
 #include <zephyr/platform/hooks.h>
 #include "nrf7120_enga_types.h"
 #include "nrf7120_enga_global.h"
 
 #if CONFIG_BOARD_EARLY_INIT_HOOK
-/* Temporary workaround while VPR does not handle starting LFRC */
+/* Temporary workaround while VPR does not handle starting clocks */
 void board_early_init_hook(void)
 {
+#if defined(CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC)
 	NRF_CLOCK_S->LFCLK.SRC = CLOCK_LFCLK_SRC_SRC_LFRC;
+#elif DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(lfxo))
+	NRF_CLOCK_S->LFCLK.SRC = CLOCK_LFCLK_SRC_SRC_LFXO;
+#else
+	NRF_CLOCK_S->LFCLK.SRC = CLOCK_LFCLK_SRC_SRC_LFSYNT;
+#endif
 	NRF_CLOCK_S->TASKS_LFCLKSTART = 1;
 
 	/* Wait for event */

boards/nordic/nrf7120pdk/nrf7120pdk_nrf7120_cpuapp_emu_defconfig

@@ -24,7 +24,9 @@ CONFIG_NULL_POINTER_EXCEPTION_DETECTION_NONE=y
 # Start SYSCOUNTER on driver init
 CONFIG_NRF_GRTC_TIMER_APP_DEFINED_INIT=n
 CONFIG_NRF_GRTC_START_SYSCOUNTER=y
-CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
+
+# LFRC is not working in EMU at the moment
+# CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
 
 # Enable Debugging when working with emulator
 CONFIG_OUTPUT_DISASSEMBLY=y

dts/common/nordic/nrf7120_enga.dtsi

@@ -43,6 +43,12 @@
 	};
 
 	clocks {
+		pclk: pclk {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <DT_FREQ_M(16)>;
+		};
+
 		lfxo: lfxo {
 			compatible = "fixed-clock";
 			#clock-cells = <0>;
@@ -657,6 +663,8 @@
 				compatible = "nordic,nrf-grtc";
 				reg = <0xe2000 0x1000>;
 				cc-num = <16>;
+				clocks = <&lfxo>, <&pclk>;
+				clock-names = "lfclock", "hfclock";
 				status = "disabled";
 			};