linux-riscv · linux-riscv-bot · Aug 13, 2025 · Aug 13, 2025 · Aug 13, 2025 · Aug 13, 2025
diff --git a/Documentation/devicetree/bindings/mfd/spacemit,p1.yaml b/Documentation/devicetree/bindings/mfd/spacemit,p1.yaml
@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/spacemit,p1.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SpacemiT P1 Power Management Integrated Circuit
+
+maintainers:
+  - Troy Mitchell <troymitchell988@gmail.com>
+
+description:
+  P1 is an I2C-controlled PMIC produced by SpacemiT.  It implements six
+  constant-on-time buck converters and twelve low-dropout regulators.
+  It also contains a load switch, watchdog timer, real-time clock, eight
+  12-bit ADC channels, and six GPIOs.  Additional details are available
+  in the "Power Stone/P1" section at the following link.
+    https://developer.spacemit.com/documentation
+
+properties:
+  compatible:
+    const: spacemit,p1
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  vin-supply:
+    description: Input supply phandle.
+
+  regulators:
+    type: object
+
+    patternProperties:
+      "^(buck[1-6]|aldo[1-4]|dldo[1-7])$":
+        type: object
+        $ref: /schemas/regulator/regulator.yaml#
+        unevaluatedProperties: false
+
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        pmic@41 {
+            compatible = "spacemit,p1";
+            reg = <0x41>;
+            interrupts = <64>;
+
+            regulators {
+                buck1 {
+                    regulator-name = "buck1";
+                    regulator-min-microvolt = <500000>;
+                    regulator-max-microvolt = <3450000>;
+                    regulator-ramp-delay = <5000>;
+                    regulator-always-on;
+                };
+
+                aldo1 {
+                    regulator-name = "aldo1";
+                    regulator-min-microvolt = <500000>;
+                    regulator-max-microvolt = <3400000>;
+                    regulator-boot-on;
+                };
+
+                dldo1 {
+                    regulator-name = "dldo1";
+                    regulator-min-microvolt = <500000>;
+                    regulator-max-microvolt = <3400000>;
+                    regulator-boot-on;
+                };
+            };
+        };
+    };
diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
@@ -28,6 +28,25 @@
 			default-state = "on";
 		};
 	};
+
+	reg_dc_in: dc-in-12v {
+		compatible = "regulator-fixed";
+		regulator-name = "dc_in_12v";
+		regulator-min-microvolt = <12000000>;
+		regulator-max-microvolt = <12000000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+
+	reg_vcc_4v: vcc-4v {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_4v";
+		regulator-min-microvolt = <4000000>;
+		regulator-max-microvolt = <4000000>;
+		regulator-boot-on;
+		regulator-always-on;
+		vin-supply = <&reg_dc_in>;
+	};
 };
 
 &emmc {
@@ -40,6 +59,122 @@
 	status = "okay";
 };
 
+&i2c8 {
+	pinctrl-0 = <&i2c8_cfg>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	pmic@41 {
+		compatible = "spacemit,p1";
+		reg = <0x41>;
+		interrupts = <64>;
+		vin-supply = <&reg_vcc_4v>;
+
+		regulators {
+			buck1 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3450000>;
+				regulator-ramp-delay = <5000>;
+				regulator-always-on;
+			};
+
+			buck2 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3450000>;
+				regulator-ramp-delay = <5000>;
+				regulator-always-on;
+			};
+
+			buck3 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <1800000>;
+				regulator-ramp-delay = <5000>;
+				regulator-always-on;
+			};
+
+			buck4 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-ramp-delay = <5000>;
+				regulator-always-on;
+			};
+
+			buck5 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3450000>;
+				regulator-ramp-delay = <5000>;
+				regulator-always-on;
+			};
+
+			buck6 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3450000>;
+				regulator-ramp-delay = <5000>;
+				regulator-always-on;
+			};
+
+			aldo1 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3400000>;
+				regulator-boot-on;
+			};
+
+			aldo2 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3400000>;
+			};
+
+			aldo3 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3400000>;
+			};
+
+			aldo4 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3400000>;
+			};
+
+			dldo1 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3400000>;
+				regulator-boot-on;
+			};
+
+			dldo2 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3400000>;
+			};
+
+			dldo3 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3400000>;
+			};
+
+			dldo4 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3400000>;
+				regulator-always-on;
+			};
+
+			dldo5 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3400000>;
+			};
+
+			dldo6 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3400000>;
+				regulator-always-on;
+			};
+
+			dldo7 {
+				regulator-min-microvolt = <500000>;
+				regulator-max-microvolt = <3400000>;
+			};
+		};
+	};
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_2_cfg>;

diff --git a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
@@ -11,6 +11,13 @@
 #define K1_GPIO(x)	(x / 32) (x % 32)
 
 &pinctrl {
+	i2c8_cfg: i2c8-cfg {
+		i2c8-0-pins {
+			pinmux = <K1_PADCONF(93, 0)>,	/* PWR_SCL */
+				 <K1_PADCONF(94, 0)>;	/* PWR_SDA */
+		};
+	};
+
 	uart0_2_cfg: uart0-2-cfg {
 		uart0-2-pins {
 			pinmux = <K1_PADCONF(68, 2)>,

diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
@@ -459,6 +459,19 @@
 			status = "disabled";
 		};
 
+		i2c8: i2c@d401d800 {
+			compatible = "spacemit,k1-i2c";
+			reg = <0x0 0xd401d800 0x0 0x38>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			clocks = <&syscon_apbc CLK_TWSI8>,
+				 <&syscon_apbc CLK_TWSI8_BUS>;
+			clock-names = "func", "bus";
+			clock-frequency = <400000>;
+			interrupts = <19>;
+			status = "disabled";
+		};
+
 		pinctrl: pinctrl@d401e000 {
 			compatible = "spacemit,k1-pinctrl";
 			reg = <0x0 0xd401e000 0x0 0x400>;

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
@@ -1238,6 +1238,17 @@ config MFD_QCOM_RPM
 	  Say M here if you want to include support for the Qualcomm RPM as a
 	  module. This will build a module called "qcom_rpm".
 
+config MFD_SPACEMIT_P1
+	tristate "SpacemiT P1 PMIC"
+	depends on I2C
+	select MFD_SIMPLE_MFD_I2C
+	help
+	  This option supports the I2C-based SpacemiT P1 PMIC, which
+	  contains regulators, a power switch, GPIOs, an RTC, and more.
+	  This option is selected when any of the supported sub-devices
+	  is configured.  The basic functionality is implemented by the
+	  simple MFD I2C driver.
+
 config MFD_SPMI_PMIC
 	tristate "Qualcomm SPMI PMICs"
 	depends on ARCH_QCOM || COMPILE_TEST

diff --git a/drivers/mfd/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c
@@ -93,12 +93,30 @@ static const struct simple_mfd_data maxim_mon_max77705 = {
 	.mfd_cell_size = ARRAY_SIZE(max77705_sensor_cells),
 };
 
+
+static const struct regmap_config spacemit_p1_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static const struct mfd_cell spacemit_p1_cells[] = {
+	{ .name = "spacemit-p1-regulator", },
+	{ .name = "spacemit-p1-rtc", },
+};
+
+static const struct simple_mfd_data spacemit_p1 = {
+	.regmap_config = &spacemit_p1_regmap_config,
+	.mfd_cell = spacemit_p1_cells,
+	.mfd_cell_size = ARRAY_SIZE(spacemit_p1_cells),
+};
+
 static const struct of_device_id simple_mfd_i2c_of_match[] = {
 	{ .compatible = "kontron,sl28cpld" },
 	{ .compatible = "silergy,sy7636a", .data = &silergy_sy7636a},
 	{ .compatible = "maxim,max5970", .data = &maxim_max5970},
 	{ .compatible = "maxim,max5978", .data = &maxim_max5970},
 	{ .compatible = "maxim,max77705-battery", .data = &maxim_mon_max77705},
+	{ .compatible = "spacemit,p1", .data = &spacemit_p1, },
 	{}
 };
 MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
@@ -1395,6 +1395,19 @@ config REGULATOR_SLG51000
 	  The SLG51000 is seven compact and customizable low dropout
 	  regulators.
 
+config REGULATOR_SPACEMIT_P1
+	tristate "SpacemiT P1 regulators"
+	depends on ARCH_SPACEMIT || COMPILE_TEST
+	depends on I2C
+	select MFD_SPACEMIT_P1
+	default ARCH_SPACEMIT
+	help
+	  Enable support for regulators implemented by the SpacemiT P1
+	  power controller.  The P1 implements 6 high-efficiency buck
+	  converters and 12 programmable LDO regulators.  To compile this
+	  driver as a module, choose M here.  The module will be called
+	  "spacemit-pmic".
+
 config REGULATOR_STM32_BOOSTER
 	tristate "STMicroelectronics STM32 BOOSTER"
 	depends on ARCH_STM32 || COMPILE_TEST

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
@@ -162,6 +162,7 @@ obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
 obj-$(CONFIG_REGULATOR_SC2731) += sc2731-regulator.o
 obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o
 obj-$(CONFIG_REGULATOR_SLG51000) += slg51000-regulator.o
+obj-$(CONFIG_REGULATOR_SPACEMIT_P1) += spacemit-p1.o
 obj-$(CONFIG_REGULATOR_STM32_BOOSTER) += stm32-booster.o
 obj-$(CONFIG_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o
 obj-$(CONFIG_REGULATOR_STM32_PWR) += stm32-pwr.o