mfd: cs40l50: Add support for CS40L50 core driver

Introduce support for Cirrus Logic Device CS40L50: a
haptic driver with waveform memory, integrated DSP,
and closed-loop algorithms.

The MFD component registers and initializes the device.

Signed-off-by: James Ogletree <jogletre@opensource.cirrus.com>
Reviewed-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/20240620161745.2312359-4-jogletre@opensource.cirrus.com
Signed-off-by: Lee Jones <lee@kernel.org>

MAINTAINERS

@@ -5213,6 +5213,8 @@ M:	Ben Bright <ben.bright@cirrus.com>
 L:	patches@opensource.cirrus.com
 S:	Supported
 F:	Documentation/devicetree/bindings/input/cirrus,cs40l50.yaml
+F:	drivers/mfd/cs40l*
+F:	include/linux/mfd/cs40l*
 
 CIRRUS LOGIC DSP FIRMWARE DRIVER
 M:	Simon Trimmer <simont@opensource.cirrus.com>

drivers/mfd/Kconfig

@@ -2243,6 +2243,36 @@ config MCP_UCB1200_TS
 
 endmenu
 
+config MFD_CS40L50_CORE
+	tristate
+	select MFD_CORE
+	select FW_CS_DSP
+	select REGMAP_IRQ
+
+config MFD_CS40L50_I2C
+	tristate "Cirrus Logic CS40L50 (I2C)"
+	select REGMAP_I2C
+	select MFD_CS40L50_CORE
+	depends on I2C
+	help
+	  Select this to support the Cirrus Logic CS40L50 Haptic
+	  Driver over I2C.
+
+	  This driver can be built as a module. If built as a module it will be
+	  called "cs40l50-i2c".
+
+config MFD_CS40L50_SPI
+	tristate "Cirrus Logic CS40L50 (SPI)"
+	select REGMAP_SPI
+	select MFD_CS40L50_CORE
+	depends on SPI
+	help
+	  Select this to support the Cirrus Logic CS40L50 Haptic
+	  Driver over SPI.
+
+	  This driver can be built as a module. If built as a module it will be
+	  called "cs40l50-spi".
+
 config MFD_VEXPRESS_SYSREG
 	tristate "Versatile Express System Registers"
 	depends on VEXPRESS_CONFIG && GPIOLIB

drivers/mfd/Makefile

@@ -88,6 +88,10 @@ obj-$(CONFIG_MFD_MADERA)	+= madera.o
 obj-$(CONFIG_MFD_MADERA_I2C)	+= madera-i2c.o
 obj-$(CONFIG_MFD_MADERA_SPI)	+= madera-spi.o
 
+obj-$(CONFIG_MFD_CS40L50_CORE)	+= cs40l50-core.o
+obj-$(CONFIG_MFD_CS40L50_I2C)	+= cs40l50-i2c.o
+obj-$(CONFIG_MFD_CS40L50_SPI)	+= cs40l50-spi.o
+
 obj-$(CONFIG_TPS6105X)		+= tps6105x.o
 obj-$(CONFIG_TPS65010)		+= tps65010.o
 obj-$(CONFIG_TPS6507X)		+= tps6507x.o