soc: silabs: Initialize DCDC from device tree

The DC-DC converter was unconditionally initialized with default
settings on Series 2. Add device tree binding and nodes, and guard
call to init function. Map DT options to config header from HAL.

Signed-off-by: Aksel Skauge Mellbye <aksel.mellbye@silabs.com>

boards/silabs/dev_kits/sltb010a/sltb010a.dts

@@ -8,6 +8,7 @@
 #include <silabs/efr32bg22.dtsi>
 #include <silabs/efr32bg2x-pinctrl.dtsi>
 #include "thunderboard.dtsi"
+#include <zephyr/dt-bindings/regulator/silabs_dcdc.h>
 
 / {
 	/* These aliases are provided for compatibility with samples */
@@ -27,6 +28,12 @@
 	};
 };
 
+&dcdc {
+	status = "okay";
+	regulator-boot-on;
+	regulator-initial-mode = <SILABS_DCDC_MODE_BUCK>;
+};
+
 &flash0 {
 	partitions {
 		/* Reserve 48 KiB for the bootloader */

boards/silabs/dev_kits/xg24_dk2601b/xg24_dk2601b.dts

@@ -8,6 +8,7 @@
 #include <silabs/efr32mg24b310f1536im48.dtsi>
 #include <silabs/efr32mg24-pinctrl.dtsi>
 #include <zephyr/dt-bindings/input/input-event-codes.h>
+#include <zephyr/dt-bindings/regulator/silabs_dcdc.h>
 
 / {
 	model = "Silicon Labs BRD2601B (xG24 Dev Kit)";
@@ -132,6 +133,13 @@
 	status = "okay";
 };
 
+&dcdc {
+	status = "okay";
+	regulator-boot-on;
+	regulator-initial-mode = <SILABS_DCDC_MODE_BUCK>;
+	silabs,pfmx-peak-current-milliamp = <120>;
+};
+
 &flash0 {
 	partitions {
 		compatible = "fixed-partitions";

boards/silabs/dev_kits/xg27_dk2602a/xg27_dk2602a.dts

@@ -8,6 +8,7 @@
 #include <silabs/efr32bg27.dtsi>
 #include <silabs/efr32bg2x-pinctrl.dtsi>
 #include "thunderboard.dtsi"
+#include <zephyr/dt-bindings/regulator/silabs_dcdc.h>
 
 / {
 	model = "Silicon Labs xG27-DK2602A Dev Kit";
@@ -31,6 +32,12 @@
 	};
 };
 
+&dcdc {
+	status = "okay";
+	regulator-boot-on;
+	regulator-initial-mode = <SILABS_DCDC_MODE_BUCK>;
+};
+
 &flash0 {
 	partitions {
 		/* Reserve 48 KiB for the bootloader */

boards/silabs/radio_boards/xg24_rb4187c/xg24_rb4187c.dts

@@ -7,6 +7,7 @@
 /dts-v1/;
 #include <silabs/efr32mg24b220f1536im48.dtsi>
 #include <zephyr/dt-bindings/input/input-event-codes.h>
+#include <zephyr/dt-bindings/regulator/silabs_dcdc.h>
 #include "xg24_rb4187c-pinctrl.dtsi"
 
 / {
@@ -117,6 +118,13 @@
 	status = "okay";
 };
 
+&dcdc {
+	status = "okay";
+	regulator-boot-on;
+	regulator-initial-mode = <SILABS_DCDC_MODE_BUCK>;
+	silabs,pfmx-peak-current-milliamp = <100>;
+};
+
 &flash0 {
 	partitions {
 		compatible = "fixed-partitions";

boards/sparkfun/thing_plus_matter_mgm240p/sparkfun_thing_plus_matter_mgm240p.dts

@@ -9,6 +9,7 @@
 #include <silabs/efr32mg24b020f1536im40.dtsi>
 #include "sparkfun_thing_plus_matter_mgm240p-pinctrl.dtsi"
 #include <zephyr/dt-bindings/input/input-event-codes.h>
+#include <zephyr/dt-bindings/regulator/silabs_dcdc.h>
 
 / {
 	 model = "Sparkfun MGM240P (Sparkfun Thing Plus Matter)";
@@ -101,6 +102,13 @@
 	status = "okay";
 };
 
+&dcdc {
+	status = "okay";
+	regulator-boot-on;
+	regulator-initial-mode = <SILABS_DCDC_MODE_BUCK>;
+	silabs,pfmx-peak-current-milliamp = <50>;
+};
+
 &flash0 {
 	partitions {
 		compatible = "fixed-partitions";

dts/arm/silabs/efr32bg22.dtsi

@@ -59,3 +59,7 @@
 	interrupts = <12 0>;
 	clocks = <&cmu CLOCK_RTCC CLOCK_BRANCH_RTCCCLK>;
 };
+
+&dcdc {
+	interrupts = <61 0>;
+};

dts/arm/silabs/efr32bg27.dtsi

@@ -64,3 +64,7 @@
 	interrupts = <54 0>;
 	clocks = <&cmu CLOCK_IADC0 CLOCK_BRANCH_IADCCLK>;
 };
+
+&dcdc {
+	interrupts = <8 0>;
+};

dts/arm/silabs/efr32bg2x.dtsi

@@ -231,6 +231,12 @@
 			status = "disabled";
 			#io-channel-cells = <1>;
 		};
+
+		dcdc: dcdc@50094000 {
+			compatible = "silabs,series2-dcdc";
+			reg = <0x50094000 0x4000>;
+			status = "disabled";
+		};
 	};
 
 	bt_hci_silabs: bt_hci_silabs {

dts/arm/silabs/efr32mg24.dtsi

@@ -248,6 +248,13 @@
 			status = "disabled";
 			#io-channel-cells = <1>;
 		};
+
+		dcdc: dcdc@50094000 {
+			compatible = "silabs,series2-dcdc";
+			reg = <0x50094000 0x4000>;
+			interrupts = <53 0>;
+			status = "disabled";
+		};
 	};
 
 

dts/bindings/regulator/silabs,series2-dcdc.yaml

@@ -0,0 +1,63 @@
+# Copyright (c) 2024 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+  Silicon Labs Series 2 DC-DC converter.
+
+  Include the bindings header file <zephyr/dt-bindings/regulator/silabs_dcdc.h> to get
+  access to relevant symbols for configuration.
+
+  The following standard properties are supported:
+
+  `regulator-boot-on`
+    Enable DC-DC converter at boot. If not set, the DC-DC converter is powered off.
+  `regulator-allow-bypass`
+    Enable bypass mode. If combined with `regulator-boot-on`, the DC-DC converter
+    is initialized to bypass mode.
+  `regulator-initial-mode`
+    DCDC operating mode. One of `SILABS_DCDC_MODE_BUCK` or `SILABS_DCDC_MODE_BOOST`.
+  `regulator-init-microvolt`
+    Output voltage for boost mode. Not used in buck mode.
+
+compatible: "silabs,series2-dcdc"
+
+include:
+  - name: base.yaml
+  - name: regulator.yaml
+    property-allowlist:
+      - regulator-boot-on
+      - regulator-allow-bypass
+      - regulator-initial-mode
+      - regulator-init-microvolt
+
+properties:
+  reg:
+    required: true
+
+  regulator-initial-mode:
+    enum: [0, 1]
+
+  regulator-init-microvolt:
+    enum:
+      - 1800000
+      - 1900000
+      - 2000000
+      - 2100000
+      - 2200000
+      - 2300000
+      - 2400000
+
+  silabs,pfmx-peak-current-milliamp:
+    type: int
+    description: Peak current draw in PFMX mode (CCM, continuous conduction mode).
+    enum:
+      - 50
+      - 65
+      - 73
+      - 80
+      - 86
+      - 93
+      - 100
+      - 106
+      - 113
+      - 120

include/zephyr/dt-bindings/regulator/silabs_dcdc.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2024 Silicon Laboratories Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_INCLUDE_DT_BINDINGS_REGULATOR_SILABS_DCDC_H_
+#define ZEPHYR_INCLUDE_DT_BINDINGS_REGULATOR_SILABS_DCDC_H_
+
+/**
+ * @defgroup regulator_silabs_dcdc Silabs DCDC devicetree helpers.
+ * @ingroup regulator_interface
+ * @{
+ */
+
+/**
+ * @name Silabs DCDC modes
+ * @{
+ */
+/** Buck mode */
+#define SILABS_DCDC_MODE_BUCK  0
+/** Boost mode */
+#define SILABS_DCDC_MODE_BOOST 1
+/** @} */
+
+/** @} */
+
+#endif /* ZEPHYR_INCLUDE_DT_BINDINGS_REGULATOR_SILABS_DCDC_H_ */

modules/hal_silabs/simplicity_sdk/CMakeLists.txt

@@ -86,6 +86,7 @@ if(CONFIG_SOC_GECKO_HAS_RADIO)
 endif()
 
 zephyr_include_directories(
+  config
   ${DEVICE_DIR}/SiliconLabs/${SILABS_DEVICE_FAMILY}/Include
   ${COMMON_DIR}/config
   ${COMMON_DIR}/inc
@@ -146,8 +147,12 @@ zephyr_library_sources_ifdef(CONFIG_SOC_GECKO_IADC         ${EMLIB_DIR}/src/em_i
 zephyr_library_sources_ifdef(CONFIG_SOC_GECKO_BURTC        ${EMLIB_DIR}/src/em_burtc.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_GECKO_CMU          ${EMLIB_DIR}/src/em_cmu.c)
 
-zephyr_library_sources_ifdef(CONFIG_SOC_GECKO_DEV_INIT
+if(CONFIG_SOC_GECKO_DEV_INIT)
+zephyr_library_sources_ifdef(CONFIG_DT_HAS_SILABS_SERIES2_DCDC_ENABLED
   ${SERVICE_DIR}/device_init/src/sl_device_init_dcdc_s2.c
+)
+endif()
+zephyr_library_sources_ifdef(CONFIG_SOC_GECKO_DEV_INIT
   ${SERVICE_DIR}/device_init/src/sl_device_init_dpll_s2.c
   ${SERVICE_DIR}/device_init/src/sl_device_init_hfrco.c
   ${SERVICE_DIR}/device_init/src/sl_device_init_hfxo_s2.c

modules/hal_silabs/simplicity_sdk/config/sl_device_init_dcdc_config.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2024 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * This configuration header is used by the HAL driver device_init_dcdc from hal_silabs,
+ * invoked through the soc_early_init hook. DeviceTree options are converted to config macros
+ * expected by the HAL driver.
+ */
+
+#ifndef SL_DEVICE_INIT_DCDC_CONFIG_H
+#define SL_DEVICE_INIT_DCDC_CONFIG_H
+
+#include <zephyr/devicetree.h>
+
+#if DT_HAS_COMPAT_STATUS_OKAY(silabs_series2_dcdc)
+
+#define DCDC_NODE DT_COMPAT_GET_ANY_STATUS_OKAY(silabs_series2_dcdc)
+
+#define SL_DEVICE_INIT_DCDC_ENABLE DT_PROP(DCDC_NODE, regulator_boot_on)
+#define SL_DEVICE_INIT_DCDC_BYPASS DT_PROP(DCDC_NODE, regulator_allow_bypass)
+
+#define SL_DEVICE_INIT_DCDC_TYPE DT_PROP_OR(DCDC_NODE, regulator_initial_mode, 0)
+
+#define SL_DEVICE_INIT_DCDC_BOOST_OUTPUT DT_ENUM_IDX(DCDC_NODE, regulator_init_microvolt)
+
+#define SL_DEVICE_INIT_DCDC_PFMX_IPKVAL_OVERRIDE                                                   \
+	DT_NODE_HAS_PROP(DCDC_NODE, silabs_pfmx_peak_current_milliamp)
+
+#define SL_DEVICE_INIT_DCDC_PFMX_IPKVAL                                                            \
+	(DT_ENUM_IDX(DCDC_NODE, silabs_pfmx_peak_current_milliamp) + 3)
+
+#endif /* DT_HAS_COMPAT_STATUS_OKAY */
+
+#endif /* SL_DEVICE_INIT_DCDC_CONFIG_H */

soc/silabs/CMakeLists.txt

@@ -4,4 +4,5 @@
 add_subdirectory(common)
 zephyr_include_directories(${SOC_FAMILY}/${SOC_SERIES})
 
+add_subdirectory_ifdef(CONFIG_SOC_FAMILY_SILABS_S2 silabs_s2)
 add_subdirectory_ifdef(CONFIG_SOC_SERIES_SIM3U silabs_sim3/sim3u)

soc/silabs/common/soc.c

@@ -214,7 +214,9 @@ void soc_early_init_hook(void)
 #endif
 
 #ifdef CONFIG_SOC_GECKO_DEV_INIT
-	sl_device_init_dcdc();
+	if (DT_HAS_COMPAT_STATUS_OKAY(silabs_series2_dcdc)) {
+		sl_device_init_dcdc();
+	}
 	sl_device_init_hfxo();
 	sl_device_init_dpll();
 

soc/silabs/silabs_s2/CMakeLists.txt

@@ -0,0 +1,2 @@
+# Copyright (c) 2024 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0