[PATCH v6 0/8] spacemit: introduce P1 PMIC support

Alex Elder
2025-06-27T14:23:13Z

The SpacemiT P1 is an I2C-controlled PMIC that implements 6 buck
converters and 12 LDOs. It contains a load switch, ADC channels,
GPIOs, a real-time clock, and a watchdog timer.

This series introduces a multifunction driver for the P1 PMIC as well
as drivers for its regulators and RTC.

This version adds a new patch to change the simple MFD driver as
suggested by Lee Jones. Rather than specifying a full regmap config
for each simple MFD, specify the max_register value desired in the
simple_mfd_data structure. That supports all existing devices (which
don't use the regmap_config option), as well as the SpacemiT P1
(which specifies the max_register).

-Alex

This series is available here:
https://github.com/riscstar/linux/tree/outgoing/pmic-v6

Between version 5 and version 6:
- Added Rob Herring's reviewed-by to patch 1
- Add the simple MFD functionality suggested by Lee Jones
- Update patch 3 (previously 2) accordingly

Here is version 5 of this series:
https://lore.kernel.org/lkml/20250625164119.1068842-1-elder@riscstar.com/

Between version 4 and version 5:
- Only check the seconds register for change when looping on read
- Return without re-enabling the RTC if writing registers fails
- If the RTC is disabled when reading, return an error

Here is version 4 of this series:
https://lore.kernel.org/lkml/20250625164119.1068842-1-elder@riscstar.com/

More complete history is available at that link.

Alex Elder (8):
dt-bindings: mfd: add support the SpacemiT P1 PMIC
mfd: simple-mfd-i2c: specify max_register
mfd: simple-mfd-i2c: add SpacemiT P1 support
regulator: spacemit: support SpacemiT P1 regulators
rtc: spacemit: support the SpacemiT P1 RTC
riscv: dts: spacemit: enable the i2c8 adapter
riscv: dts: spacemit: define fixed regulators
riscv: dts: spacemit: define regulator constraints

.../devicetree/bindings/mfd/spacemit,p1.yaml | 86 +++++++++
.../boot/dts/spacemit/k1-bananapi-f3.dts | 138 +++++++++++++++
arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi | 7 +
arch/riscv/boot/dts/spacemit/k1.dtsi | 11 ++
drivers/mfd/Kconfig | 11 ++
drivers/mfd/simple-mfd-i2c.c | 30 ++--
drivers/mfd/simple-mfd-i2c.h | 2 +-
drivers/regulator/Kconfig | 12 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/spacemit-p1.c | 157 ++++++++++++++++
drivers/rtc/Kconfig | 10 ++
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-spacemit-p1.c | 167 ++++++++++++++++++
13 files changed, 620 insertions(+), 13 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mfd/spacemit,p1.yaml
create mode 100644 drivers/regulator/spacemit-p1.c
create mode 100644 drivers/rtc/rtc-spacemit-p1.c

base-commit: 2aeda9592360c200085898a258c4754bfe879921
--
2.45.2