soc: silabs_exx32: Make HFRCO frequency configurable

This commit adds an option to configure the frequency
in Hz for the HFRCO clock source. The default value
for this option is 0 which skips the configuration of the HFRCO.
This feature is supported for efm32gg, efm32jg, efm32pg, efm32fg
and efm32mg SOCs currently.

Signed-off-by: Pooja Karanjekar <pooja.karanjekar@lemonbeat.com>

soc/arm/silabs_exx32/Kconfig

@@ -164,6 +164,17 @@ config CMU_LFXO_FREQ
 	  Set the external low frequency oscillator frequency in Hz. This should be set by the
 	  board's defconfig.
 
+config CMU_HFRCO_FREQ
+	int "Internal high frequency RC oscillator frequency"
+	default 0
+	depends on SOC_GECKO_HAS_HFRCO_FREQRANGE
+	help
+	  Set the internal high frequency RC oscillator frequency in Hz. This should be set by the
+	  board's defconfig. Only supported values may be used here. Setting this to 0, skips the
+	  configuration of the high frequency RC oscillator completely. This may be desired, if
+	  the bootloader already configured it properly or the device's default clock source should
+	  be used with it's default configuration.
+
 endif # SOC_GECKO_CMU
 
 config SOC_GECKO_HAS_INDIVIDUAL_PIN_LOCATION
@@ -182,4 +193,12 @@ config SOC_GECKO_HAS_ERRATA_RTCC_E201
 	  feature enabled by setting CCV1TOP in RTCC_CTRL fails to wrap the counter
 	  when RTCC_CNT is equal to RTCC_CC1_CCV, as intended."
 
+config SOC_GECKO_HAS_HFRCO_FREQRANGE
+	bool
+	help
+	  If enabled, indicates that configuration of HFRCO frequency for this SOC is supported
+	  via FREQRANGE field. This is supported for e.g. efr32fg1p, efr32mg12p series.
+	  If disabled, indicates that configuration of HFRCO frequency for corresponding SOC
+	  is not supported via this field. This is the case for e.g. efm32hg, efm32wg series.
+
 endif # SOC_FAMILY_EXX32

soc/arm/silabs_exx32/common/soc.c

@@ -60,9 +60,18 @@ static ALWAYS_INLINE void clock_init(void)
 	CMU_OscillatorEnable(cmuOsc_HFRCO, false, false);
 #elif (defined CONFIG_CMU_HFCLK_HFRCO)
 	/*
-	 * This is the default clock, the controller starts with, so nothing to
-	 * do here.
+	 * This is the default clock, the controller starts with
 	 */
+
+#ifdef CONFIG_SOC_GECKO_HAS_HFRCO_FREQRANGE
+	if (CONFIG_CMU_HFRCO_FREQ) {
+		/* Setting system HFRCO frequency */
+		CMU_HFRCOBandSet(CONFIG_CMU_HFRCO_FREQ);
+
+		/* Using HFRCO as high frequency clock, HFCLK */
+		CMU_ClockSelectSet(cmuClock_HF, cmuSelect_HFRCO);
+	}
+#endif
 #else
 #error "Unsupported clock source for HFCLK selected"
 #endif

soc/arm/silabs_exx32/efm32gg11b/Kconfig.series

@@ -15,6 +15,7 @@ config SOC_SERIES_EFM32GG11B
 	select HAS_SYS_POWER_STATE_SLEEP_2
 	select HAS_SYS_POWER_STATE_SLEEP_3
 	select SOC_GECKO_HAS_INDIVIDUAL_PIN_LOCATION
+	select SOC_GECKO_HAS_HFRCO_FREQRANGE
 	select SOC_GECKO_CMU
 	select SOC_GECKO_EMU
 	select SOC_GECKO_GPIO

soc/arm/silabs_exx32/efm32jg12b/Kconfig.series

@@ -14,6 +14,7 @@ config SOC_SERIES_EFM32JG12B
 	select HAS_SYS_POWER_STATE_SLEEP_2
 	select HAS_SYS_POWER_STATE_SLEEP_3
 	select SOC_GECKO_HAS_INDIVIDUAL_PIN_LOCATION
+	select SOC_GECKO_HAS_HFRCO_FREQRANGE
 	select SOC_GECKO_CMU
 	select SOC_GECKO_EMU
 	select SOC_GECKO_GPIO

soc/arm/silabs_exx32/efm32pg12b/Kconfig.series

@@ -16,6 +16,7 @@ config SOC_SERIES_EFM32PG12B
 	select HAS_SYS_POWER_STATE_SLEEP_2
 	select HAS_SYS_POWER_STATE_SLEEP_3
 	select SOC_GECKO_HAS_INDIVIDUAL_PIN_LOCATION
+	select SOC_GECKO_HAS_HFRCO_FREQRANGE
 	select SOC_GECKO_CMU
 	select SOC_GECKO_EMU
 	select SOC_GECKO_GPIO

soc/arm/silabs_exx32/efr32fg1p/Kconfig.series

@@ -16,6 +16,7 @@ config SOC_SERIES_EFR32FG1P
 	select HAS_SYS_POWER_STATE_SLEEP_2
 	select HAS_SYS_POWER_STATE_SLEEP_3
 	select SOC_GECKO_HAS_INDIVIDUAL_PIN_LOCATION
+	select SOC_GECKO_HAS_HFRCO_FREQRANGE
 	select SOC_GECKO_CMU
 	select SOC_GECKO_GPIO
 	select SOC_GECKO_HAS_ERRATA_RTCC_E201

soc/arm/silabs_exx32/efr32mg12p/Kconfig.series

@@ -17,6 +17,7 @@ config SOC_SERIES_EFR32MG12P
 	select HAS_SYS_POWER_STATE_SLEEP_2
 	select HAS_SYS_POWER_STATE_SLEEP_3
 	select SOC_GECKO_HAS_INDIVIDUAL_PIN_LOCATION
+	select SOC_GECKO_HAS_HFRCO_FREQRANGE
 	select SOC_GECKO_CMU
 	select SOC_GECKO_EMU
 	select SOC_GECKO_GPIO