[PATCH v8 3/8] mfd: simple-mfd-i2c: add SpacemiT P1 support

Alex Elder
2025-07-10T17:51:16Z

Enable support for the RTC and regulators found in the SpacemiT P1
PMIC. Support is implemented by the simple I2C MFD driver.

The P1 PMIC is normally implemented with the SpacemiT K1 SoC. This
PMIC provides 6 buck converters and 12 LDO regulators. It also
implements a switch, watchdog timer, real-time clock, and more.
Initially its RTC and regulators are supported.

Signed-off-by: Alex Elder <elder@riscstar.com>
---
drivers/mfd/Kconfig | 11 +++++++++++
drivers/mfd/simple-mfd-i2c.c | 12 ++++++++++++
2 files changed, 23 insertions(+)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 6fb3768e3d71c..01805c3eec57d 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1182,6 +1182,17 @@ 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
index 5138aa72140b5..df44c2664fbfc 100644
--- a/drivers/mfd/simple-mfd-i2c.c
+++ b/drivers/mfd/simple-mfd-i2c.c
@@ -97,12 +97,24 @@ static const struct simple_mfd_data maxim_mon_max77705 = {
.mfd_cell_size = ARRAY_SIZE(max77705_sensor_cells),
};

+static const struct mfd_cell spacemit_p1_cells[] = {
+ { .name = "spacemit-p1-regulator", },
+ { .name = "spacemit-p1-rtc", },
+};
+
+static const struct simple_mfd_data spacemit_p1 = {
+ .mfd_cell = spacemit_p1_cells,
+ .mfd_cell_size = ARRAY_SIZE(spacemit_p1_cells),
+ .max_register = 0xaa,
+};
+
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);
--
2.45.2