regulator: pf0900: Add PMIC PF0900 support

The PF0900 is a power management integrated circuit (PMIC) optimized
for high performance i.MX9x based applications. It features five high
efficiency buck converters, three linear and one vaon regulators. It
provides low quiescent current in Standby and low power off Modes.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202507221720.jxsGRfcE-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202506181134.0Hkvy7CK-lkp@intel.com/
Signed-off-by: Joy Zou <joy.zou@nxp.com>
Link: https://patch.msgid.link/20250731-b4-pf09-v2-v3-2-4c2659516582@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/Kconfig

@@ -1006,6 +1006,14 @@ config REGULATOR_PCAP
 	 This driver provides support for the voltage regulators of the
 	 PCAP2 PMIC.
 
+config REGULATOR_PF0900
+	tristate "NXP PF0900/PF0901/PF09XX regulator driver"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	Say y here to support the NXP PF0900/PF0901/PF09XX PMIC
+	regulator driver.
+
 config REGULATOR_PF8X00
 	tristate "NXP PF8100/PF8121A/PF8200 regulator driver"
 	depends on I2C && OF

drivers/regulator/Makefile

@@ -124,6 +124,7 @@ obj-$(CONFIG_REGULATOR_QCOM_SPMI) += qcom_spmi-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_USB_VBUS) += qcom_usb_vbus-regulator.o
 obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
 obj-$(CONFIG_REGULATOR_PCA9450) += pca9450-regulator.o
+obj-$(CONFIG_REGULATOR_PF0900) += pf0900-regulator.o
 obj-$(CONFIG_REGULATOR_PF9453) += pf9453-regulator.o
 obj-$(CONFIG_REGULATOR_PF8X00) += pf8x00-regulator.o
 obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o