[PATCH v8 4/8] regulator: spacemit: support SpacemiT P1 regulators

Alex Elder
2025-07-10T17:51:17Z

Add support for the regulators found in the SpacemiT P1 PMIC. This
PMIC provides 6 buck converters and 12 LDO regulators.

The PMIC is implemented as a multi-function device. These regulators
are probed based on this driver being named in a MFD cell in the simple
MFD I2C driver.

Signed-off-by: Alex Elder <elder@riscstar.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
---
drivers/regulator/Kconfig | 12 +++
drivers/regulator/Makefile | 1 +
drivers/regulator/spacemit-p1.c | 157 ++++++++++++++++++++++++++++++++
3 files changed, 170 insertions(+)
create mode 100644 drivers/regulator/spacemit-p1.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 7423954153b07..3e7feeebf8aca 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1395,6 +1395,18 @@ 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
+ 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
index be98b29d6675d..278f5b8d1c7d7 100644
--- 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
diff --git a/drivers/regulator/spacemit-p1.c b/drivers/regulator/spacemit-p1.c
new file mode 100644
index 0000000000000..d437e6738ea1e
--- /dev/null
+++ b/drivers/regulator/spacemit-p1.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for regulators found in the SpacemiT P1 PMIC
+ *
+ * Copyright (C) 2025 by RISCstar Solutions Corporation. All rights reserved.
+ * Derived from code from SpacemiT.
+ * Copyright (c) 2023, SPACEMIT Co., Ltd
+ */
+
+#include <linux/array_size.h>
+#include <linux/bits.h>
+#include <linux/device.h>
+#include <linux/linear_range.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+
+#define MOD_NAME "spacemit-p1-regulator"
+
+enum p1_regulator_id {
+ P1_BUCK1,
+ P1_BUCK2,
+ P1_BUCK3,
+ P1_BUCK4,
+ P1_BUCK5,
+ P1_BUCK6,
+
+ P1_ALDO1,
+ P1_ALDO2,
+ P1_ALDO3,
+ P1_ALDO4,
+
+ P1_DLDO1,
+ P1_DLDO2,
+ P1_DLDO3,
+ P1_DLDO4,
+ P1_DLDO5,
+ P1_DLDO6,
+ P1_DLDO7,
+};
+
+static const struct regulator_ops p1_regulator_ops = {
+ .list_voltage = regulator_list_voltage_linear_range,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .set_voltage_time_sel = regulator_set_voltage_time_sel,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+};
+
+/* Selector value 255 can be used to disable the buck converter on sleep */
+static const struct linear_range p1_buck_ranges[] = {
+ REGULATOR_LINEAR_RANGE(500000, 0, 170, 5000),
+ REGULATOR_LINEAR_RANGE(1375000, 171, 254, 25000),
+};
+
+/* Selector value 0 can be used for suspend */
+static const struct linear_range p1_ldo_ranges[] = {
+ REGULATOR_LINEAR_RANGE(500000, 11, 127, 25000),
+};
+
+/* These define the voltage selector field for buck and LDO regulators */
+#define BUCK_MASK GENMASK(7, 0)
+#define LDO_MASK GENMASK(6, 0)
+
+#define P1_ID(_TYPE, _n) P1_ ## _TYPE ## _n
+#define P1_ENABLE_REG(_off, _n) ((_off) + 3 * ((_n) - 1))
+
+#define P1_REG_DESC(_TYPE, _type, _n, _s, _off, _mask, _nv, _ranges) \
+ { \
+ .name = #_type #_n, \
+ .supply_name = _s, \
+ .of_match = of_match_ptr(#_type #_n), \
+ .regulators_node = of_match_ptr("regulators"), \
+ .id = P1_ID(_TYPE, _n), \
+ .n_voltages = _nv, \
+ .ops = &p1_regulator_ops, \
+ .owner = THIS_MODULE, \
+ .linear_ranges = _ranges, \
+ .n_linear_ranges = ARRAY_SIZE(_ranges), \
+ .vsel_reg = P1_ENABLE_REG(_off, _n) + 1, \
+ .vsel_mask = _mask, \
+ .enable_reg = P1_ENABLE_REG(_off, _n), \
+ .enable_mask = BIT(0), \
+ }
+
+#define P1_BUCK_DESC(_n) \
+ P1_REG_DESC(BUCK, buck, _n, "vcc", 0x47, BUCK_MASK, 254, p1_buck_ranges)
+
+#define P1_ALDO_DESC(_n) \
+ P1_REG_DESC(ALDO, aldo, _n, "vcc", 0x5b, LDO_MASK, 117, p1_ldo_ranges)
+
+#define P1_DLDO_DESC(_n) \
+ P1_REG_DESC(DLDO, dldo, _n, "buck5", 0x67, LDO_MASK, 117, p1_ldo_ranges)
+
+static const struct regulator_desc p1_regulator_desc[] = {
+ P1_BUCK_DESC(1),
+ P1_BUCK_DESC(2),
+ P1_BUCK_DESC(3),
+ P1_BUCK_DESC(4),
+ P1_BUCK_DESC(5),
+ P1_BUCK_DESC(6),
+
+ P1_ALDO_DESC(1),
+ P1_ALDO_DESC(2),
+ P1_ALDO_DESC(3),
+ P1_ALDO_DESC(4),
+
+ P1_DLDO_DESC(1),
+ P1_DLDO_DESC(2),
+ P1_DLDO_DESC(3),
+ P1_DLDO_DESC(4),
+ P1_DLDO_DESC(5),
+ P1_DLDO_DESC(6),
+ P1_DLDO_DESC(7),
+};
+
+static int p1_regulator_probe(struct platform_device *pdev)
+{
+ struct regulator_config config = { };
+ struct device *dev = &pdev->dev;
+ u32 i;
+
+ /*
+ * The parent device (PMIC) owns the regmap. Since we don't
+ * provide one in the config structure, that one will be used.
+ */
+ config.dev = dev->parent;
+
+ for (i = 0; i < ARRAY_SIZE(p1_regulator_desc); i++) {
+ const struct regulator_desc *desc = &p1_regulator_desc[i];
+ struct regulator_dev *rdev;
+
+ rdev = devm_regulator_register(dev, desc, &config);
+ if (IS_ERR(rdev))
+ return dev_err_probe(dev, PTR_ERR(rdev),
+ "error registering regulator %s\n",
+ desc->name);
+ }
+
+ return 0;
+}
+
+static struct platform_driver p1_regulator_driver = {
+ .probe = p1_regulator_probe,
+ .driver = {
+ .name = MOD_NAME,
+ },
+};
+
+module_platform_driver(p1_regulator_driver);
+
+MODULE_DESCRIPTION("SpacemiT P1 regulator driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" MOD_NAME);
--
2.45.2