drivers: regulator: add support for RaspberryPi Pico regulator.
Add support for rpi_pico regulator.
Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>
diff --git a/drivers/regulator/CMakeLists.txt b/drivers/regulator/CMakeLists.txt
index 170fff4..c05e2dd 100644
--- a/drivers/regulator/CMakeLists.txt
+++ b/drivers/regulator/CMakeLists.txt
@@ -10,3 +10,4 @@
zephyr_library_sources_ifdef(CONFIG_REGULATOR_NPM6001 regulator_npm6001.c)
zephyr_library_sources_ifdef(CONFIG_REGULATOR_PCA9420 regulator_pca9420.c)
zephyr_library_sources_ifdef(CONFIG_REGULATOR_SHELL regulator_shell.c)
+zephyr_library_sources_ifdef(CONFIG_REGULATOR_RPI_PICO regulator_rpi_pico.c)
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index e0329db..415fcfd 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -25,5 +25,6 @@
source "drivers/regulator/Kconfig.npm1100"
source "drivers/regulator/Kconfig.npm6001"
source "drivers/regulator/Kconfig.pca9420"
+source "drivers/regulator/Kconfig.rpi_pico"
endif # REGULATOR
diff --git a/drivers/regulator/Kconfig.rpi_pico b/drivers/regulator/Kconfig.rpi_pico
new file mode 100644
index 0000000..fe97a52
--- /dev/null
+++ b/drivers/regulator/Kconfig.rpi_pico
@@ -0,0 +1,19 @@
+# Copyright (c) 2023 TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>
+# SPDX-License-Identifier: Apache-2.0
+
+config REGULATOR_RPI_PICO
+ bool "RaspberryPi Pico regulator driver"
+ default y
+ depends on DT_HAS_RASPBERRYPI_CORE_SUPPLY_REGULATOR_ENABLED
+ help
+ Enable support for the RaspberryPi Pico regulator.
+
+if REGULATOR_RPI_PICO
+
+config REGULATOR_RPI_PICO_INIT_PRIORITY
+ int "RaspberryPi Pico regulator driver init priority"
+ default KERNEL_INIT_PRIORITY_DEVICE
+ help
+ Init priority for the RaspberryPi Pico regulator driver.
+
+endif
diff --git a/drivers/regulator/regulator_rpi_pico.c b/drivers/regulator/regulator_rpi_pico.c
new file mode 100644
index 0000000..f2c0af1
--- /dev/null
+++ b/drivers/regulator/regulator_rpi_pico.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2023 TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define DT_DRV_COMPAT raspberrypi_core_supply_regulator
+
+#include <zephyr/devicetree.h>
+#include <zephyr/drivers/regulator.h>
+#include <zephyr/dt-bindings/regulator/rpi_pico.h>
+#include <zephyr/sys/linear_range.h>
+#include <zephyr/toolchain.h>
+#include <hardware/regs/vreg_and_chip_reset.h>
+#include <hardware/structs/vreg_and_chip_reset.h>
+
+static const struct linear_range core_ranges[] = {
+ LINEAR_RANGE_INIT(800000u, 0u, 0u, 5u),
+ LINEAR_RANGE_INIT(850000u, 50000u, 6u, 15u),
+};
+
+static const size_t num_core_ranges = ARRAY_SIZE(core_ranges);
+
+struct regulator_rpi_pico_config {
+ struct regulator_common_config common;
+ vreg_and_chip_reset_hw_t * const reg;
+ const bool brown_out_detection;
+ const uint32_t brown_out_threshold;
+};
+
+struct regulator_rpi_pico_data {
+ struct regulator_common_data data;
+};
+
+/*
+ * APIs
+ */
+
+static unsigned int regulator_rpi_pico_count_voltages(const struct device *dev)
+{
+ return linear_range_group_values_count(core_ranges, num_core_ranges);
+}
+
+static int regulator_rpi_pico_list_voltage(const struct device *dev, unsigned int idx,
+ int32_t *volt_uv)
+{
+ return linear_range_group_get_value(core_ranges, num_core_ranges, idx, volt_uv);
+}
+
+static int regulator_rpi_pico_set_voltage(const struct device *dev, int32_t min_uv, int32_t max_uv)
+{
+ const struct regulator_rpi_pico_config *config = dev->config;
+ uint16_t idx;
+ int ret;
+
+ ret = linear_range_group_get_win_index(core_ranges, num_core_ranges, min_uv, max_uv, &idx);
+ if (ret < 0) {
+ return ret;
+ }
+
+ config->reg->vreg = ((config->reg->vreg & ~VREG_AND_CHIP_RESET_VREG_VSEL_BITS) |
+ (idx << VREG_AND_CHIP_RESET_VREG_VSEL_LSB));
+
+ return 0;
+}
+
+static int regulator_rpi_pico_get_voltage(const struct device *dev, int32_t *volt_uv)
+{
+ const struct regulator_rpi_pico_config *config = dev->config;
+
+ return linear_range_group_get_value(
+ core_ranges, num_core_ranges,
+ ((config->reg->vreg & VREG_AND_CHIP_RESET_VREG_VSEL_BITS) >>
+ VREG_AND_CHIP_RESET_VREG_VSEL_LSB),
+ volt_uv);
+}
+
+static int regulator_rpi_pico_enable(const struct device *dev)
+{
+ const struct regulator_rpi_pico_config *config = dev->config;
+
+ config->reg->vreg |= BIT(VREG_AND_CHIP_RESET_VREG_EN_LSB);
+
+ return 0;
+}
+
+static int regulator_rpi_pico_disable(const struct device *dev)
+{
+ const struct regulator_rpi_pico_config *config = dev->config;
+
+ config->reg->vreg &= ~BIT(VREG_AND_CHIP_RESET_VREG_EN_LSB);
+
+ return 0;
+}
+
+static int regulator_rpi_pico_set_mode(const struct device *dev, regulator_mode_t mode)
+{
+ const struct regulator_rpi_pico_config *config = dev->config;
+
+ if (mode & REGULATOR_RPI_PICO_MODE_HI_Z) {
+ config->reg->vreg |= REGULATOR_RPI_PICO_MODE_HI_Z;
+ } else {
+ config->reg->vreg &= (~REGULATOR_RPI_PICO_MODE_HI_Z);
+ }
+
+ return 0;
+}
+
+static int regulator_rpi_pico_get_mode(const struct device *dev, regulator_mode_t *mode)
+{
+ const struct regulator_rpi_pico_config *config = dev->config;
+
+ *mode = (config->reg->vreg & REGULATOR_RPI_PICO_MODE_HI_Z);
+
+ return 0;
+}
+
+static int regulator_rpi_pico_init(const struct device *dev)
+{
+ const struct regulator_rpi_pico_config *config = dev->config;
+
+ if (config->brown_out_detection) {
+ config->reg->bod =
+ (BIT(VREG_AND_CHIP_RESET_BOD_EN_LSB) |
+ (config->brown_out_threshold << VREG_AND_CHIP_RESET_BOD_VSEL_LSB));
+ } else {
+ config->reg->bod &= ~BIT(VREG_AND_CHIP_RESET_BOD_EN_LSB);
+ }
+
+ regulator_common_data_init(dev);
+
+ return regulator_common_init(dev, true);
+}
+
+static const struct regulator_driver_api api = {
+ .enable = regulator_rpi_pico_enable,
+ .disable = regulator_rpi_pico_disable,
+ .count_voltages = regulator_rpi_pico_count_voltages,
+ .list_voltage = regulator_rpi_pico_list_voltage,
+ .set_voltage = regulator_rpi_pico_set_voltage,
+ .get_voltage = regulator_rpi_pico_get_voltage,
+ .set_mode = regulator_rpi_pico_set_mode,
+ .get_mode = regulator_rpi_pico_get_mode,
+};
+
+#define REGULATOR_RPI_PICO_DEFINE_ALL(inst) \
+ static struct regulator_rpi_pico_data data_##inst; \
+ \
+ static const struct regulator_rpi_pico_config config_##inst = { \
+ .common = REGULATOR_DT_COMMON_CONFIG_INIT(inst), \
+ .reg = (vreg_and_chip_reset_hw_t * const)DT_INST_REG_ADDR(inst), \
+ .brown_out_detection = DT_INST_PROP(inst, raspberrypi_brown_out_detection), \
+ .brown_out_threshold = DT_INST_ENUM_IDX(inst, raspberrypi_brown_out_threshold), \
+ }; \
+ \
+ DEVICE_DT_INST_DEFINE(inst, regulator_rpi_pico_init, NULL, &data_##inst, &config_##inst, \
+ POST_KERNEL, CONFIG_REGULATOR_RPI_PICO_INIT_PRIORITY, &api);
+
+DT_INST_FOREACH_STATUS_OKAY(REGULATOR_RPI_PICO_DEFINE_ALL)
diff --git a/dts/arm/rpi_pico/rp2040.dtsi b/dts/arm/rpi_pico/rp2040.dtsi
index a5a6fe8..5910411 100644
--- a/dts/arm/rpi_pico/rp2040.dtsi
+++ b/dts/arm/rpi_pico/rp2040.dtsi
@@ -7,6 +7,7 @@
#include <arm/armv6-m.dtsi>
#include <zephyr/dt-bindings/gpio/gpio.h>
#include <zephyr/dt-bindings/i2c/i2c.h>
+#include <zephyr/dt-bindings/regulator/rpi_pico.h>
#include <mem.h>
#include "rpi_pico_common.dtsi"
@@ -184,6 +185,14 @@
status = "disabled";
#pwm-cells = <3>;
};
+
+ vreg: vreg@40064000 {
+ compatible = "raspberrypi,core-supply-regulator";
+ reg = <0x40064000 1>;
+ status = "okay";
+ raspberrypi,brown-out-detection;
+ raspberrypi,brown-out-threshold = <860000>;
+ };
};
pinctrl: pin-controller {
diff --git a/dts/bindings/regulator/raspberrypi,core-supply-regulator.yaml b/dts/bindings/regulator/raspberrypi,core-supply-regulator.yaml
new file mode 100644
index 0000000..2034ccd
--- /dev/null
+++ b/dts/bindings/regulator/raspberrypi,core-supply-regulator.yaml
@@ -0,0 +1,48 @@
+# Copyright (c), 2023 TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>
+# SPDX -License-Identifier: Apache-2.0
+
+description: |
+ RaspberryPi Pico core supply regurator
+
+compatible: "raspberrypi,core-supply-regulator"
+
+include:
+ - name: base.yaml
+ - name: regulator.yaml
+ property-allowlist:
+ - regulator-always-on
+ - regulator-boot-on
+ - regulator-min-microvolt
+ - regulator-max-microvolt
+ - regulator-allowed-modes
+ - regulator-initial-mode
+
+properties:
+ raspberrypi,brown-out-detection:
+ type: boolean
+ description:
+ Enable brown-out detection
+
+ raspberrypi,brown-out-threshold:
+ type: int
+ default: 860000
+ enum:
+ - 473000
+ - 516000
+ - 559000
+ - 602000
+ - 645000
+ - 688000
+ - 731000
+ - 774000
+ - 817000
+ - 860000
+ - 903000
+ - 946000
+ - 989000
+ - 1032000
+ - 1075000
+ - 1118000
+ description: |
+ Reset if the core voltage drops below this threshold for a particular time
+ (determined by the 'brown-out detection assertion delay').
diff --git a/include/zephyr/dt-bindings/regulator/rpi_pico.h b/include/zephyr/dt-bindings/regulator/rpi_pico.h
new file mode 100644
index 0000000..55f2421
--- /dev/null
+++ b/include/zephyr/dt-bindings/regulator/rpi_pico.h
@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2023 TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_INCLUDE_DT_BINDINGS_REGULATOR_RPI_PICO_H_
+#define ZEPHYR_INCLUDE_DT_BINDINGS_REGULATOR_RPI_PICO_H_
+
+#define REGULATOR_RPI_PICO_MODE_NORMAL 0x0
+#define REGULATOR_RPI_PICO_MODE_HI_Z 0x2
+
+#endif /* ZEPHYR_INCLUDE_DT_BINDINGS_REGULATOR_RPI_PICO_H_ */
